SALT19 Agent Utility Grid
payment-ready until 2026-10-23
MCP/x402 decision and verification utilities for autonomous software agents, paid in USDC on Base.
Call it x402 v2
x402 v2
- Base URL
- https://api.salt19.com
- Payment
- x402 v2, header channel
$ curl -i -X POST 'https://api.salt19.com/v1/agent-claim-output-verifier' An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.
Endpoints 14 paid routes on api.salt19.com
POST/v1/agent-claim-output-verifier Base$0.45since 08-31
POST/v1/agent-code-change-risk-gate Base$1.21since 08-31
POST/v1/agent-decision-preflight Base$0.45since 08-31
POST/v1/agent-plan-verifier Base$0.72since 08-31
POST/v1/commerce-decision Base$0.01since 08-31
POST/v1/commerce-receipt Base$0.03since 08-31
POST/v1/commerce-verify Base$0.01since 08-31
POST/v1/dependency-go-no-go Base$0.20since 08-31
6 more in Example 402 response
Prices as captured in the 402 response: median $0.125 across the 14 endpoints.
Example 402 response
Endpoints and prices
| Method | Path | Description | Price | Network | Asset | 402 channel | Captured |
|---|---|---|---|---|---|---|---|
| POST | / | Map an autonomous agent claim or output to supplied evidence and return SUPPORTED, PARTIALLY_SUPPORTED, NOT_PROVEN, or CONTRADICTED with explicit unsupported elements, contradictions, missing evidence, and recommended verification. | $0.45 | Base | USDC | header | since 08-31 |
| POST | / | Static pre-merge risk gate for autonomous code changes: inspect a supplied unified diff for security-sensitive surfaces, destructive operations, architecture/constraint conflicts, test requirements, rollback risk, and bounded breaking-change risk before an agent merges or deploys. | $1.21 | Base | USDC | header | since 08-31 |
| POST | / | Before an autonomous coding agent installs or adopts software, return a bounded GO, WARN, or BLOCK decision with evidence and a portable SALT19 verification receipt. | $0.45 | Base | USDC | header | since 08-31 |
| POST | / | Verify an autonomous agent plan before execution for missing preconditions, destructive steps, unsafe ordering, goal misalignment, constraint violations, and repair actions, returning a bounded GO/WARN/BLOCK result. | $0.72 | Base | USDC | header | since 08-31 |
| POST | / | Before an autonomous agent pays an x402 challenge, bind the request, accepted payment offer, and machine spending policy into a deterministic GO/WARN/BLOCK decision with SHA-256 commitments. | $0.01 | Base | USDC | header | since 08-31 |
| POST | / | Verify an x402 commercial state and persist a signed Ed25519 Proof402 receipt whose Commerce State Root commits request, offer, policy, payment, settlement, and delivery evidence; receipts are later Merkle-batched for public inclusion proofs. | $0.03 | Base | USDC | header | since 08-31 |
| POST | / | Verify that an x402 v2 payment payload, settlement evidence, original request, accepted offer, spending policy, and delivered response are mutually bound; SALT19 operations can additionally be checked against authoritative D1 commercial state. | $0.01 | Base | USDC | header | since 08-31 |
| POST | / | Dependency approval decision for coding agents: decide whether an npm dependency or package is safe to install or adopt and return GO, WARN, or BLOCK using vulnerabilities, security, license, maintenance, deprecation, and package metadata. | $0.20 | Base | USDC | header | since 08-31 |
| POST | / | Compare current and target npm versions and return GO/WARN/BLOCK plus UPGRADE/DEFER/BLOCK guidance, bounded semver risk, OSV security implications, recommended tests, and explicit NOT_PROVEN runtime, peer, migration, and ecosystem compatibility boundaries. | $0.16 | Base | USDC | header | since 08-31 |
| POST | / | GitHub repository due diligence for coding agents: evaluate whether a public or open-source repository is safe and maintained enough to adopt using license, maintenance, release freshness, activity, project health, and risk signals. | $0.09 | Base | USDC | header | since 08-31 |
| POST | / | Can this AI model run on my graphics card? Estimate model memory requirements and check whether a quantized LLM fits available GPU VRAM before loading or local inference. | $0.05 | Base | USDC | header | since 08-31 |
| POST | / | Check whether an npm package is deprecated or vulnerable before installing it, including vulnerabilities, license, maintenance, freshness, dependency health, and package.json risk signals. | $0.03 | Base | USDC | header | since 08-31 |
| POST | / | Repository adoption decision for autonomous coding agents using public GitHub maintenance, archive, license, and repository-health evidence, with explicit UNKNOWN and NOT_PROVEN boundaries for dependency, security, compatibility, integration, and project-fit claims. | $0.35 | Base | USDC | header | since 08-31 |
| POST | / | Inspect a URL before an autonomous agent calls it, and preflight or verify a website or external API endpoint is healthy and safe to call by checking HTTP status, redirects, latency, and security headers. | $0.03 | Base | USDC | header | since 08-31 |
Payment evidence
402 payload captured at . Check evidence JSON · Measurement methodology.
First of 14 payloads captured by the monitor.
160 lines, scroll inside
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/model-memory-fit",
"mimeType": "application/json",
"description": "Can this AI model run on my graphics card? Estimate model memory requirements and check whether a quantized LLM fits available GPU VRAM before loading or local inference."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"vram_gb": 11,
"parameter_count_b": 7,
"quantization_bits": 4,
"runtime_overhead_ratio": 0.15
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "FIT",
"vram_gib": 11,
"limitations": [
"KV cache and architecture-specific buffers are not modeled"
],
"headroom_gib": 7.25,
"estimated_total_gib": 3.75,
"estimated_weight_gib": 3.26
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"parameter_count_b",
"quantization_bits",
"vram_gb"
],
"properties": {
"vram_gb": {
"type": "number",
"maximum": 10000,
"minimum": 0.1
},
"parameter_count_b": {
"type": "number",
"maximum": 10000,
"minimum": 0.01
},
"quantization_bits": {
"type": "number",
"maximum": 32,
"minimum": 1
},
"runtime_overhead_ratio": {
"type": "number",
"maximum": 2,
"minimum": 0
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
} Other captured 402 responses (13)
Captured payload 2 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/commerce-receipt",
"mimeType": "application/json",
"description": "Verify an x402 commercial state and persist a signed Ed25519 Proof402 receipt whose Commerce State Root commits request, offer, policy, payment, settlement, and delivery evidence; receipts are later Merkle-batched for public inclusion proofs."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"request": {
"method": "POST",
"resource": "https://seller.example/v1/data"
},
"delivery": {
"result": "ok"
},
"settlement": {
"payer": "0x...",
"network": "eip155:8453",
"success": true,
"transaction": "0x..."
},
"payment_payload": {
"payload": {
"signature": "0x...",
"authorization": {
"to": "0x...",
"from": "0x...",
"nonce": "0x...",
"value": "20000",
"validAfter": "0",
"validBefore": "1999999999"
}
},
"accepted": {
"asset": "0x...",
"payTo": "0x...",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453"
},
"x402Version": 2
},
"payment_required": {
"accepts": [
{
"asset": "0x...",
"payTo": "0x...",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"x402Version": 2
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"receipt": {
"id": "...",
"signing_key_id": "...",
"verification_url": "https://api.salt19.com/proof402/receipts/...",
"signature_algorithm": "Ed25519"
},
"verdict": "VERIFIED_LOCAL_EVIDENCE",
"commerce_root": "..."
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"request",
"payment_required",
"payment_payload",
"settlement",
"delivery"
],
"properties": {
"policy": {
"type": "object",
"properties": {
"allowed_assets": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"allowed_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"blocked_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"allowed_networks": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"spend_24h_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_amount_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_per_day_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_timeout_seconds": {
"type": "integer",
"maximum": 3600,
"minimum": 1
}
},
"additionalProperties": false
},
"request": {
"type": "object",
"required": [
"resource"
],
"properties": {
"body": {},
"method": {
"type": "string",
"maxLength": 16
},
"resource": {
"type": "string",
"maxLength": 2048,
"minLength": 1
},
"parameters": {
"type": "object"
},
"content_type": {
"type": "string",
"maxLength": 128
}
},
"additionalProperties": false
},
"delivery": {},
"settlement": {
"type": "object"
},
"payment_payload": {
"type": "object"
},
"payment_required": {
"type": "object",
"required": [
"x402Version",
"accepts"
],
"properties": {
"accepts": {
"type": "array",
"items": {
"type": "object"
},
"maxItems": 16,
"minItems": 1
},
"resource": {
"type": "object"
},
"extensions": {
"type": "object"
},
"x402Version": {
"enum": [
2
],
"type": "integer"
}
},
"additionalProperties": true
},
"expected_delivery": {
"type": "object",
"properties": {
"expected_sha256": {
"type": "string",
"pattern": "^[0-9a-fA-F]{64}$"
},
"required_fields": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
}
},
"additionalProperties": false
},
"target_salt19_operation_id": {
"type": "string",
"maxLength": 128,
"minLength": 8
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 3 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "200000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/dependency-go-no-go",
"mimeType": "application/json",
"description": "Dependency approval decision for coding agents: decide whether an npm dependency or package is safe to install or adopt and return GO, WARN, or BLOCK using vulnerabilities, security, license, maintenance, deprecation, and package metadata."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"package": "hono",
"version": "4.13.3"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"reasons": [
"No OSV vulnerabilities returned",
"License declared",
"Recent publication activity"
],
"verdict": "GO",
"evidence": {
"license": "MIT",
"package": "hono",
"version": "4.13.3",
"vulnerabilities": 0
},
"policy_version": "salt19-dependency-policy-v1"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"package"
],
"properties": {
"package": {
"type": "string",
"maxLength": 214,
"minLength": 1
},
"version": {
"type": "string",
"maxLength": 64
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 4 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "90000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/github-repo-preflight",
"mimeType": "application/json",
"description": "GitHub repository due diligence for coding agents: evaluate whether a public or open-source repository is safe and maintained enough to adopt using license, maintenance, release freshness, activity, project health, and risk signals."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"repo": "https://github.com/cloudflare/workers-sdk"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"license": "Apache-2.0",
"archived": false,
"repository": "cloudflare/workers-sdk",
"risk_flags": [],
"open_issues": 123,
"default_branch": "main",
"days_since_push": 1
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"repo"
],
"properties": {
"repo": {
"type": "string",
"maxLength": 512
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 5 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "350000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/repo-adoption-go-no-go",
"mimeType": "application/json",
"description": "Repository adoption decision for autonomous coding agents using public GitHub maintenance, archive, license, and repository-health evidence, with explicit UNKNOWN and NOT_PROVEN boundaries for dependency, security, compatibility, integration, and project-fit claims."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"repo": "cloudflare/workers-sdk"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"score": 0.86,
"verdict": "GO",
"findings": [
"Repository is neither archived nor disabled.",
"License declared as Apache-2.0."
],
"maintenance": {
"state": "SUPPORTED",
"days_since_push": 1
},
"project_fit": {
"state": "NOT_PROVEN"
},
"compatibility": {
"state": "NOT_PROVEN"
},
"license_assessment": {
"state": "SUPPORTED",
"declared_license": "Apache-2.0"
},
"security_indicators": {
"state": "NOT_PROVEN"
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"repo"
],
"properties": {
"repo": {
"type": "string",
"maxLength": 512
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 6 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "450000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/agent-claim-output-verifier",
"mimeType": "application/json",
"description": "Map an autonomous agent claim or output to supplied evidence and return SUPPORTED, PARTIALLY_SUPPORTED, NOT_PROVEN, or CONTRADICTED with explicit unsupported elements, contradictions, missing evidence, and recommended verification."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"claim": "The deployment is healthy and payment reconciliation succeeded.",
"evidence": [
{
"id": "health",
"relation": "SUPPORTS",
"statement": "Health endpoint returned 200"
},
{
"id": "stripe",
"relation": "NEUTRAL",
"statement": "No reconciliation result was collected"
}
],
"required_standard": "Every material claim element must have direct evidence"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "PARTIALLY_SUPPORTED",
"confidence": 0.5,
"contradictions": [],
"missing_evidence": [
"Independent evidence supporting or contradicting: payment reconciliation succeeded"
],
"supported_elements": [
"The deployment is healthy"
],
"unsupported_elements": [
"payment reconciliation succeeded"
]
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"claim"
],
"properties": {
"claim": {
"type": "string",
"maxLength": 12000,
"minLength": 1
},
"context": {
"type": "string",
"maxLength": 8000
},
"evidence": {
"type": "array",
"items": {
"oneOf": [
{
"type": "string",
"maxLength": 8000,
"minLength": 1
},
{
"type": "object",
"required": [
"statement"
],
"properties": {
"id": {
"type": "string",
"maxLength": 256
},
"source": {
"type": "string",
"maxLength": 1000
},
"relation": {
"enum": [
"SUPPORTS",
"CONTRADICTS",
"NEUTRAL"
],
"type": "string"
},
"statement": {
"type": "string",
"maxLength": 8000,
"minLength": 1
},
"observed_at": {
"type": "string",
"maxLength": 128
}
},
"additionalProperties": false
}
]
},
"maxItems": 64
},
"required_standard": {
"type": "string",
"maxLength": 2000
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 7 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "450000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/agent-decision-preflight",
"mimeType": "application/json",
"description": "Before an autonomous coding agent installs or adopts software, return a bounded GO, WARN, or BLOCK decision with evidence and a portable SALT19 verification receipt."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"target": {
"package": "hono",
"version": "4.13.3"
},
"constraints": {
"require_license": true,
"max_vulnerabilities": 0
},
"decision_type": "npm_dependency"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"score": 100,
"reasons": [
"No OSV vulnerability records returned for this package/version."
],
"receipt": {
"evidence_sha256": "...",
"verification_url": "https://api.salt19.com/receipts/..."
},
"verdict": "GO",
"evidence": {
"package": "hono",
"version": "4.13.3",
"vulnerabilities": 0
},
"confidence": 0.95
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"decision_type",
"target"
],
"properties": {
"target": {
"type": "object",
"properties": {
"repo": {
"type": "string",
"maxLength": 512
},
"package": {
"type": "string",
"maxLength": 214,
"minLength": 1
},
"version": {
"type": "string",
"maxLength": 64
}
},
"additionalProperties": false
},
"constraints": {
"type": "object",
"properties": {
"require_latest": {
"type": "boolean"
},
"require_license": {
"type": "boolean"
},
"max_days_since_push": {
"type": "integer",
"maximum": 3650,
"minimum": 1
},
"max_vulnerabilities": {
"type": "integer",
"maximum": 100,
"minimum": 0
}
},
"additionalProperties": false
},
"decision_type": {
"enum": [
"npm_dependency",
"github_repository"
],
"type": "string"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 8 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/commerce-decision",
"mimeType": "application/json",
"description": "Before an autonomous agent pays an x402 challenge, bind the request, accepted payment offer, and machine spending policy into a deterministic GO/WARN/BLOCK decision with SHA-256 commitments."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"policy": {
"allowed_networks": [
"eip155:8453"
],
"spend_24h_atomic": "700000",
"max_amount_atomic": "50000",
"max_per_day_atomic": "5000000"
},
"request": {
"body": {
"symbol": "ETH"
},
"method": "POST",
"resource": "https://seller.example/v1/data"
},
"payment_required": {
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7b7cC6A8Bf10A74A5f7",
"payTo": "0x1111111111111111111111111111111111111111",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"x402Version": 2
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"decision": "GO",
"offer_hash": "...",
"policy_hash": "...",
"policy_valid": true,
"request_hash": "...",
"preflight_root": "...",
"selected_offer": {
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453"
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"request",
"payment_required",
"policy"
],
"properties": {
"policy": {
"type": "object",
"properties": {
"allowed_assets": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"allowed_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"blocked_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"allowed_networks": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"spend_24h_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_amount_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_per_day_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_timeout_seconds": {
"type": "integer",
"maximum": 3600,
"minimum": 1
}
},
"additionalProperties": false
},
"request": {
"type": "object",
"required": [
"resource"
],
"properties": {
"body": {},
"method": {
"type": "string",
"maxLength": 16
},
"resource": {
"type": "string",
"maxLength": 2048,
"minLength": 1
},
"parameters": {
"type": "object"
},
"content_type": {
"type": "string",
"maxLength": 128
}
},
"additionalProperties": false
},
"payment_required": {
"type": "object",
"required": [
"x402Version",
"accepts"
],
"properties": {
"accepts": {
"type": "array",
"items": {
"type": "object"
},
"maxItems": 16,
"minItems": 1
},
"resource": {
"type": "object"
},
"extensions": {
"type": "object"
},
"x402Version": {
"enum": [
2
],
"type": "integer"
}
},
"additionalProperties": true
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 9 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/url-http-preflight",
"mimeType": "application/json",
"description": "Inspect a URL before an autonomous agent calls it, and preflight or verify a website or external API endpoint is healthy and safe to call by checking HTTP status, redirects, latency, and security headers."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://example.com"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"status": 200,
"final_url": "https://example.com/",
"redirects": 0,
"latency_ms": 110,
"content_type": "text/html",
"security_headers": {
"x_content_type_options": true,
"content_security_policy": false,
"strict_transport_security": true
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"format": "uri",
"maxLength": 2048
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 10 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "30000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/npm-package-intel",
"mimeType": "application/json",
"description": "Check whether an npm package is deprecated or vulnerable before installing it, including vulnerabilities, license, maintenance, freshness, dependency health, and package.json risk signals."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"package": "hono",
"version": "4.13.3"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"license": "MIT",
"package": "hono",
"version": "4.13.3",
"deprecated": false,
"published_at": "2026-08-19T00:00:00.000Z",
"vulnerabilities": 0
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"package"
],
"properties": {
"package": {
"type": "string",
"maxLength": 214,
"minLength": 1
},
"version": {
"type": "string",
"maxLength": 64
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 11 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/commerce-verify",
"mimeType": "application/json",
"description": "Verify that an x402 v2 payment payload, settlement evidence, original request, accepted offer, spending policy, and delivered response are mutually bound; SALT19 operations can additionally be checked against authoritative D1 commercial state."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"request": {
"method": "POST",
"resource": "https://seller.example/v1/data"
},
"delivery": {
"result": "ok"
},
"settlement": {
"payer": "0x...",
"network": "eip155:8453",
"success": true,
"transaction": "0x..."
},
"payment_payload": {
"payload": {
"signature": "0x...",
"authorization": {
"to": "0x...",
"from": "0x...",
"nonce": "0x...",
"value": "20000",
"validAfter": "0",
"validBefore": "1999999999"
}
},
"accepted": {
"asset": "0x...",
"payTo": "0x...",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453"
},
"x402Version": 2
},
"payment_required": {
"accepts": [
{
"asset": "0x...",
"payTo": "0x...",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"x402Version": 2
},
"expected_delivery": {
"required_fields": [
"result"
]
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "VERIFIED_LOCAL_EVIDENCE",
"limitations": [
"Caller-provided settlement evidence is structurally checked but not independently queried on-chain."
],
"commerce_root": "...",
"delivery_bound": true,
"payment_binding_valid": true,
"settlement_evidence_authority": "CALLER_PROVIDED"
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"request",
"payment_required",
"payment_payload",
"settlement",
"delivery"
],
"properties": {
"policy": {
"type": "object",
"properties": {
"allowed_assets": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"allowed_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"blocked_payees": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
},
"allowed_networks": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 32
},
"spend_24h_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_amount_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_per_day_atomic": {
"type": "string",
"pattern": "^[0-9]+$"
},
"max_timeout_seconds": {
"type": "integer",
"maximum": 3600,
"minimum": 1
}
},
"additionalProperties": false
},
"request": {
"type": "object",
"required": [
"resource"
],
"properties": {
"body": {},
"method": {
"type": "string",
"maxLength": 16
},
"resource": {
"type": "string",
"maxLength": 2048,
"minLength": 1
},
"parameters": {
"type": "object"
},
"content_type": {
"type": "string",
"maxLength": 128
}
},
"additionalProperties": false
},
"delivery": {},
"settlement": {
"type": "object"
},
"payment_payload": {
"type": "object"
},
"payment_required": {
"type": "object",
"required": [
"x402Version",
"accepts"
],
"properties": {
"accepts": {
"type": "array",
"items": {
"type": "object"
},
"maxItems": 16,
"minItems": 1
},
"resource": {
"type": "object"
},
"extensions": {
"type": "object"
},
"x402Version": {
"enum": [
2
],
"type": "integer"
}
},
"additionalProperties": true
},
"expected_delivery": {
"type": "object",
"properties": {
"expected_sha256": {
"type": "string",
"pattern": "^[0-9a-fA-F]{64}$"
},
"required_fields": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 64
}
},
"additionalProperties": false
},
"target_salt19_operation_id": {
"type": "string",
"maxLength": 128,
"minLength": 8
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 12 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "720000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/agent-plan-verifier",
"mimeType": "application/json",
"description": "Verify an autonomous agent plan before execution for missing preconditions, destructive steps, unsafe ordering, goal misalignment, constraint violations, and repair actions, returning a bounded GO/WARN/BLOCK result."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"goal": "Safely deploy the tested Worker change",
"plan": [
"Inspect repository status",
"Run focused tests",
"Deploy through the guarded workflow"
],
"constraints": [
"Do not deploy before validation"
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"score": 1,
"repairs": [],
"verdict": "GO",
"unsafe_steps": [],
"ordering_errors": [],
"constraint_violations": [],
"missing_preconditions": []
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"goal",
"plan"
],
"properties": {
"goal": {
"type": "string",
"maxLength": 4000,
"minLength": 1
},
"plan": {
"type": "array",
"items": {
"type": "string",
"maxLength": 4000,
"minLength": 1
},
"maxItems": 64,
"minItems": 1
},
"constraints": {
"type": "array",
"items": {
"type": "string",
"maxLength": 4000,
"minLength": 1
},
"maxItems": 32
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 13 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "160000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/dependency-upgrade-go-no-go",
"mimeType": "application/json",
"description": "Compare current and target npm versions and return GO/WARN/BLOCK plus UPGRADE/DEFER/BLOCK guidance, bounded semver risk, OSV security implications, recommended tests, and explicit NOT_PROVEN runtime, peer, migration, and ecosystem compatibility boundaries."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"package": "hono",
"runtime": "cloudflare-workers",
"framework": "hono",
"target_version": "4.13.3",
"current_version": "4.13.2"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"score": 0.84,
"verdict": "GO",
"upgrade_verdict": "UPGRADE",
"breaking_changes": {
"state": "NOT_PROVEN",
"version_change": "PATCH"
},
"recommended_tests": [
"Install/resolve the target dependency in the actual caller lockfile."
],
"runtime_compatibility": {
"state": "NOT_PROVEN"
},
"security_implications": {
"state": "SUPPORTED",
"target_osv_records": 0,
"current_osv_records": 0
},
"peer_dependency_conflicts": {
"state": "NOT_PROVEN"
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"package",
"current_version",
"target_version"
],
"properties": {
"package": {
"type": "string",
"maxLength": 214,
"minLength": 1
},
"runtime": {
"type": "string",
"maxLength": 128
},
"framework": {
"type": "string",
"maxLength": 128
},
"constraints": {
"type": "array",
"items": {
"type": "string",
"maxLength": 4000
},
"maxItems": 32
},
"target_version": {
"type": "string",
"maxLength": 64,
"minLength": 1
},
"current_version": {
"type": "string",
"maxLength": 64,
"minLength": 1
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Captured payload 14 of 14
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x2ebb16acddda257ca9d6e1eb64ac1fdf3891e84f",
"amount": "1210000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://api.salt19.com/v1/agent-code-change-risk-gate",
"mimeType": "application/json",
"description": "Static pre-merge risk gate for autonomous code changes: inspect a supplied unified diff for security-sensitive surfaces, destructive operations, architecture/constraint conflicts, test requirements, rollback risk, and bounded breaking-change risk before an agent merges or deploys."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"diff": "diff --git a/src/app.ts b/src/app.ts\n--- a/src/app.ts\n+++ b/src/app.ts\n@@ -1 +1 @@\n-old()\n+newer()",
"context": "Cloudflare Worker API",
"constraints": [
"Do not bypass authorization checks"
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "WARN",
"risk_score": 0.44,
"rollback_risk": "MEDIUM",
"security_flags": [],
"test_requirements": [
"Run API/MCP contract tests."
],
"architecture_conflicts": [],
"breaking_change_probability": {
"basis": "Uncalibrated static heuristic; not an empirical probability.",
"state": "PARTIALLY_SUPPORTED",
"value": 0.28
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"diff"
],
"properties": {
"diff": {
"type": "string",
"maxLength": 48000,
"minLength": 1
},
"context": {
"type": "string",
"maxLength": 4000
},
"constraints": {
"type": "array",
"items": {
"type": "string",
"maxLength": 4000
},
"maxItems": 32
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
},
"payment-identifier": {
"info": {
"required": false
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"required"
],
"properties": {
"id": {
"type": "string",
"pattern": "^[a-zA-Z0-9_-]+$",
"maxLength": 128,
"minLength": 16
},
"required": {
"type": "boolean"
}
}
}
}
},
"x402Version": 2
}Can I trust it score from our own monitoring
score from our own monitoring
82/100 Solid
#86 of 138 in Verification. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.
- Reliability
- 77.9% uptime 30d
- Compliance
- A 14/14 checks pass
- Price
- $0.01 to $1.21 p44 in Verification
- Risk
- clean no risk flag
- Traction
- $0.01 30d 1 buyers, top buyer 100% (address, not entity)
- Last change
- price changed 32m ago latest 10 in 30d
14/14 compliance checks
- 402 payload captured
- accepts[] array present
- payTo address recoverable
- payTo at accepts[0].payTo (conformant shape)
- payTo is a valid on-chain address
- atomic price declared
- atomic price in a sane range
- asset (token) address declared
- network resolves to CAIP-2
- payment scheme declared
- served over HTTPS
- declares the current x402 version (2)
- EIP-712 domain parameters present on every EVM entry
- x402 v2 envelope delivered in the payment-required header
402 terms unchanged since 2026-10-16. Last up 2026-10-16.
── Site signals
- homepage reachable
- openapi doc
- pricing page
- llms.txt
- robots.txt
- terms page
How the score works
What the score read on this service: status online, 77.9% uptime 30d, 873ms response p95, x402 compliance 14 of 14, $0.01 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.
The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.
Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.
It is a score inside Verification, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 138 listings, this one among them: the same 138 the position above is counted against. When the two differ, the field is the wider one, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.
Settled via payAI ($0.01, 1 tx). Traction is a conservative undercount; first settlement seen 2026-09-12.
All measured facts
What it does
MCP/x402 decision and verification utilities for autonomous software agents, paid in USDC on Base.
SALT19 Agent Utility Grid is a listed x402 Verification API. Captured payment terms name Base. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.
Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.
Page rendered at . This response time is separate from the observation and computation times attached to each measurement.
Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.
Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.
Observed daily coverage: 2026-09-17 to 2026-10-16 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Latest settlement in the assessment: . Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.
Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.
x402 List home · Services · Verification
- uptime · latest daily rollup
- 73.9%
- uptime 7d
- 77%
- uptime 30d
- 77.9%
- uptime 90d
- 84.8%
- response p95
- 873ms
- avg response
- 537ms
- total checks
- 2,710
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
- price (min)
- $0.01
- price (max)
- $1.21
- category percentile (min)
- p44 in Verification
- category percentile (max)
- p85 in Verification
- endpoints / prices
- 14 / 10
- model
- tiered
- stability
- 0%
No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.
- domain age
- 177d
- registrar
- GoDaddy.com, LLC
- hosting
- custom
- domain created
- 2026-04-18
Identity facts, not a risk score.
- assessment volume 30d
- $0.01
- exact assessment volume 30d (USD)
- 0.01
- assessment recorded at (UTC)
- 2026-10-16T06:13:00.480Z
- buyers 30d
- 1
- settlements 30d
- 1
- measured since
- 2026-09-12 (start of our harvest window)
- last settlement
- 2026-10-08
- top buyer share
- 100% of 30d volume (address, not entity)
- top 3 buyers share
- 100% of 30d volume (addresses, not entities)
- concentrated volume
- no
- trend 7d vs 30d
- 0.00x the 30d daily rate
- networks
- eip155:8453
- volume all-time
- $0.02
- settlements all-time
- 2
- median settlement 30d
- $0.01
- max settlement 30d
- $0.01
Assessment volume uses the latest 30d assessment. Over time sums daily address snapshots, rounded to cents and refreshed separately. The two sources can differ in timing, precision and shared-address attribution. Amounts use cents for comparison; known sub-cent values keep up to 12 significant digits. The exact stored assessment value is shown above.
Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.
Top buyer share lowers the on-chain traction part of the ranking score behind this page's verdict and /best, by up to half when one address holds all 30d volume. The Recommended and Highest volume sorts of the services list do not use it; they use the Concentrated volume rule instead.
- member since
- 2026-08-31
Recent checks
| Checked at (UTC) | Status | HTTP | Response | Endpoints |
|---|---|---|---|---|
| Online | 402 | 736ms | 14 | |
| Offline | no response | 2143ms | 0 | |
| Online | 402 | 334ms | 14 | |
| Online | 402 | 434ms | 14 | |
| Online | 402 | 579ms | 14 | |
| Offline | no response | 2143ms | 0 | |
| Online | 402 | 353ms | 14 | |
| Online | 402 | 359ms | 14 | |
| Offline | no response | 2143ms | 0 | |
| Online | 402 | 522ms | 14 | |
| Online | 402 | 283ms | 14 | |
| Online | 402 | 683ms | 14 | |
| Offline | no response | 2143ms | 0 | |
| Online | 402 | 540ms | 14 | |
| Online | 402 | 326ms | 14 | |
| Online | 402 | 546ms | 14 | |
| Offline | no response | 2144ms | 0 | |
| Online | 402 | 627ms | 14 |
Changeslatest 10 in 30d
| Observed at (UTC) | Change | Evidence |
|---|---|---|
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
| |
| price changed |
|
Amounts are on-wire atomic units in the named asset.
Over time
On-chain volume daily snapshots, USD 30d: $0.01, peak $0.01 on 10-08
volume no data in the payload
Distinct buyers per dayDistinct buyers per day
Uptime 29 of 29 completed days below 100%
uptime below 100%, to scale
- Volume 30d
- $0.01
- Uptime
- 29 of 29 completed days below 100%
More charts
Response time daily average, ms min 373ms, avg 543ms, max 1431ms
09-17 to 10-16* UTC
Scores over time
x402 compliance low 14/14, high 14/14
09-17 to 10-16* UTC
Price percentile in Verification own low to high; exact values below
09-17 to 10-16* UTC
Site signals present (of 6) own low to high; exact values below
09-17 to 10-16* UTC
Scores: one day per column, 09-17 to 10-16*, on the columns of Response time. Uptime held below 100% on some days in this window, including any partial day. Daily readings remain in the Uptime strip and Values. The checklist grew from 11 to 14 checks on 2026-07-28, before this window. Pillar lines use their own low and high. Exact dated readings are available in each readout and in Values.
Each series spans only the dates it has data for. Every series is also served as JSON at /api, /scores, /volume and /buyers.
Values
* today so far, partial (UTC).
The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.
Daily snapshot total, 30d: $0.01, peak $0.01 on 10-08. The visible 30d total in Traction comes from the latest assessment. These sources can differ in their window, refresh time, cent rounding and shared-address attribution.
Daily address snapshots: 2026-09-17 to 2026-10-16 UTC; * today so far, partial (UTC). Daily snapshots store cents. A recorded $0.00 with settlements cannot distinguish exact zero from volume rounded away. Lost precision is unavailable here.
Settlement volume uses the stored USD valuation of tracked payments; it is distinct from token quantities. USD-pegged assets are valued at 1 USD per token in these rollups. The measured settlement floor does not cover all payments to this service.
Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.
| Day | Volume | Buyers | Settlements | Uptime | Response | Compliance | Price percentile | Site signals |
|---|---|---|---|---|---|---|---|---|
| 2026-09-17 | no data | no data | no data | 84.44% | 382.00ms | 14/14 | p45 | 0/6 |
| 2026-09-18 | no data | no data | no data | 86.67% | 417.06ms | 14/14 | p45 | 0/6 |
| 2026-09-19 | no data | no data | no data | 78.89% | 418.77ms | 14/14 | p45 | 2/6 |
| 2026-09-20 | no data | no data | no data | 75.56% | 373.00ms | 14/14 | p45 | 2/6 |
| 2026-09-21 | no data | no data | no data | 76.67% | 403.78ms | 14/14 | p47 | 2/6 |
| 2026-09-22 | no data | no data | no data | 76.4% | 462.32ms | 14/14 | p47 | 2/6 |
| 2026-09-23 | no data | no data | no data | 77.78% | 473.93ms | 14/14 | p47 | 0/6 |
| 2026-09-24 | no data | no data | no data | 73.33% | 407.58ms | 14/14 | p47 | 0/6 |
| 2026-09-25 | no data | no data | no data | 74.44% | 452.13ms | 14/14 | p47 | 2/6 |
| 2026-09-26 | no data | no data | no data | 77.78% | 424.86ms | 14/14 | p46 | 2/6 |
| 2026-09-27 | no data | no data | no data | 80% | 451.06ms | 13/13 | p45 | 2/6 |
| 2026-09-28 | no data | no data | no data | 80% | 459.71ms | 14/14 | p45 | 2/6 |
| 2026-09-29 | no data | no data | no data | 77.78% | 441.73ms | 14/14 | p44 | 0/6 |
| 2026-09-30 | no data | no data | no data | 81.11% | 455.45ms | 14/14 | p44 | 0/6 |
| 2026-10-01 | no data | no data | no data | 78.89% | 418.31ms | 14/14 | p44 | 2/6 |
| 2026-10-02 | no data | no data | no data | 80% | 460.47ms | 14/14 | p44 | 2/6 |
| 2026-10-03 | no data | no data | no data | 80% | 485.44ms | 14/14 | p44 | 2/6 |
| 2026-10-04 | no data | no data | no data | 81.11% | 442.74ms | 14/14 | p44 | 2/6 |
| 2026-10-05 | no data | no data | no data | 77.53% | 436.54ms | 14/14 | p44 | 0/6 |
| 2026-10-06 | no data | no data | no data | 73.33% | 421.02ms | 14/14 | p44 | 0/6 |
| 2026-10-07 | no data | no data | no data | 72.22% | 554.42ms | 14/14 | p44 | 2/6 |
| 2026-10-08 | $0.01 | 1 | 1 | 77.78% | 871.16ms | 13/13 | p66 | 2/6 |
| 2026-10-09 | no data | no data | no data | 74.44% | 1431.30ms | 13/13 | p44 | 0/6 |
| 2026-10-10 | no data | no data | no data | 72.22% | 1384.72ms | 13/13 | p44 | 0/6 |
| 2026-10-11 | no data | no data | no data | 80% | 626.44ms | 14/14 | p44 | 0/6 |
| 2026-10-12 | no data | no data | no data | 81.11% | 598.90ms | 14/14 | p44 | 0/6 |
| 2026-10-13 | no data | no data | no data | 78.89% | 544.80ms | 14/14 | p44 | 2/6 |
| 2026-10-14 | no data | no data | no data | 77.53% | 638.17ms | 14/14 | p44 | 2/6 |
| 2026-10-15 | no data | no data | no data | 73.33% | 451.09ms | 14/14 | p44 | 2/6 |
| 2026-10-16* | no data | no data | no data | 73.91% | 500.18ms | 14/14 | p44 | 2/6 |
Alternatives in Verification
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