Kertivo
payment-ready until 2026-10-21
Kertivo is the trust layer for bot-to-bot payments on Base USDC.
Call it x402 v2
x402 v2
- Base URL
- https://kertivo.com
- Payment
- x402 v2, header channel
$ curl -i -X POST 'https://kertivo.com/address/check' An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.
Endpoints 5 paid routes on kertivo.com
POST/address/check Base$0.001since 10-14
POST/address/check/full Base$0.005since 10-14
POST/check Base$0.01since 10-14
POST/check/deep Base$0.05since 10-14
POST/trust/lookup Base$0.002since 10-14
Prices as captured in the 402 response: median $0.005 across the 5 endpoints, unchanged since first capture.
Example 402 response
Endpoints and prices
| Method | Path | Description | Price | Network | Asset | 402 channel | Captured |
|---|---|---|---|---|---|---|---|
| POST | / | Address-poisoning check before you send USDC on Base. Body {from, to} (or sender/recipient; optional chain=base; token=USDC only · other tokens 400 not charged; optional contacts/known_addresses): scans the sender's recent Base USDC transfers for lookalikes (same first/last 4 hex) plus dust or zero-value transfers. Returns risk low/medium/high, lookalikes, seenBefore, reasons, coverage. | $0.001 | Base | USDC | header | since 10-14 |
| POST | / | Full-history address-poisoning check before you send USDC on Base. Same risk/lookalike/seenBefore logic as /address/check, but funding history comes from ONE Blockscout index call (x402, up to the sender's 500 most recent Base USDC transfers; v2 page fallback) so coverage is usually the sender's full Base USDC history. Body {from, to}. Not charged if the index is down. Cheap partial/RPC tier: POST /address/check ($0.001). | $0.005 | Base | USDC | header | since 10-14 |
| POST | / | Payment verification for x402: verify a USDC transaction on Base · did this payment really settle, and did it pay the right address the right amount? Send a tx hash (or x402 authorization): confirmations, real-USDC transfer check, expectedPayTo/expectedAmount match, fake-USDC and lookalike-address warnings, who funded the payer (external, self_funded, unknown), plain-English summary and a receipt. Body {txHash|authorization, expectedPayTo?, expectedAmount?}. Free demo: POST /demo. | $0.01 | Base | USDC | header | since 10-14 |
| POST | / | Did this USDC payment settle, and who funded this wallet (the payer)? Deep Base verification: confirmations, payTo/amount match, fake-token and lookalike warnings, plus the payer's FULL inbound USDC history (no window), top funders, coverage stats and a recheckable sha256 receipt. Not charged if the index is down. Body {txHash, expectedPayTo?, expectedAmount?}. | $0.05 | Base | USDC | header | since 10-14 |
| POST | / | Is this x402 API trustworthy? Body {url}. Returns its latest Kertivo Index endpoint trust score/grade (A, B, F, C-never-live, C-went-dark, or ungraded) and run date, plus evidence from a real paid test call: 402 status, price, payTo, settlement tx, on-chain check, HTTP status after paying, latency, schema and delivery result. Not in the index: status not_indexed. Also a public claims tally (buyer-filed disputed vs delivered), kept separate from the grade. Free grade-only: GET /trust/lookup?url= | $0.002 | Base | USDC | header | since 10-14 |
Payment evidence
402 payload captured at . Check evidence JSON · Measurement methodology.
First of 5 payloads captured by the monitor.
471 lines, scroll inside
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://kertivo.com/check",
"tags": [
"payment-verification",
"x402",
"base",
"usdc",
"settlement"
],
"mimeType": "application/json",
"description": "Payment verification for x402: verify a USDC transaction on Base — did this payment really settle, and did it pay the right address the right amount? Send a tx hash (or x402 authorization): confirmations, real-USDC transfer check, expectedPayTo/expectedAmount match, fake-USDC and lookalike-address warnings, who funded the payer (external, self_funded, unknown), plain-English summary and a receipt. Body {txHash|authorization, expectedPayTo?, expectedAmount?}. Free demo: POST /demo.",
"serviceName": "Kertivo Check: payment verify"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"txHash": "0xc37cbdfa44230f05129348d5160254abf354791d79de68228b201ba09de143c1",
"expectedPayTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"expectedAmount": "1"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"mode": "live_paid",
"block": 52409752,
"found": true,
"match": {
"ok": true,
"payToMatch": true,
"amountMatch": true
},
"funding": {
"verdict": "external",
"scannedBlocks": {
"to": 52409752,
"from": 52360000,
"complete": false,
"stoppedEarly": "enough recent funding found"
}
},
"payment": {
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"amount": "1"
},
"receipt": {
"reason": null,
"verdict": "external",
"rpcCalls": 9,
"priceCharged": "0.01 USDC",
"blocksScanned": {
"to": 52409752,
"from": 52360000,
"complete": false
}
},
"summary": "1 USDC from 0xfc1e… to 0x509e… at block 52409752. Matches expected payment. Payer was funded externally.",
"warnings": [],
"confirmed": true,
"confirmations": 1200
}
}
},
"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",
"properties": {
"txHash": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Base mainnet transaction hash"
},
"authorization": {
"type": "object",
"required": [
"from",
"nonce"
],
"properties": {
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"nonce": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$"
},
"validAfter": {
"type": [
"string",
"integer"
]
},
"validBefore": {
"type": [
"string",
"integer"
],
"description": "unix seconds"
}
},
"description": "Optional EIP-3009 authorization (x402 exact payload) to check when there is no tx or the tx is not found"
},
"expectedPayTo": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Expected recipient (full-address, case-insensitive compare)"
},
"selfAddresses": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 10,
"description": "Optional: other addresses you control; funding from them counts as self_funded"
},
"expectedAmount": {
"type": [
"string",
"number"
],
"description": "Expected USDC amount, decimal (e.g. \"0.01\")"
}
},
"description": "Provide txHash, or authorization (EIP-3009) when you have no tx hash, or both."
},
"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",
"required": [
"found",
"summary",
"mode",
"receipt"
],
"properties": {
"mode": {
"enum": [
"live_paid",
"demo"
],
"type": "string"
},
"block": {
"type": [
"integer",
"null"
]
},
"found": {
"type": "boolean"
},
"match": {
"type": [
"object",
"null"
],
"properties": {
"ok": {
"type": "boolean"
},
"payToMatch": {
"type": [
"boolean",
"null"
]
},
"amountMatch": {
"type": [
"boolean",
"null"
]
}
}
},
"status": {
"type": [
"string",
"null"
]
},
"funding": {
"type": [
"object",
"null"
],
"properties": {
"reason": {
"enum": [
"no_inbound_in_window",
"scan_incomplete"
],
"type": "string",
"description": "Only present when verdict=unknown"
},
"verdict": {
"enum": [
"external",
"self_funded",
"unknown"
],
"type": "string"
},
"topFunders": {
"type": "array"
},
"scannedBlocks": {
"type": "object",
"properties": {
"to": {
"type": "integer"
},
"from": {
"type": "integer"
},
"complete": {
"type": "boolean"
}
}
},
"payeeFundedPayer": {
"type": "boolean"
}
}
},
"payment": {
"type": [
"object",
"null"
],
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"amount": {
"type": "string"
}
}
},
"receipt": {
"type": "object",
"required": [
"blocksScanned",
"rpcCalls",
"priceCharged",
"verdict",
"reason"
],
"properties": {
"reason": {
"enum": [
"no_inbound_in_window",
"scan_incomplete",
null
],
"type": [
"string",
"null"
]
},
"verdict": {
"enum": [
"external",
"self_funded",
"unknown",
null
],
"type": [
"string",
"null"
]
},
"rpcCalls": {
"type": "integer"
},
"priceCharged": {
"type": "string",
"description": "'0.01 USDC' on /check, '0' on /demo"
},
"blocksScanned": {
"type": [
"object",
"null"
],
"properties": {
"to": {
"type": "integer"
},
"from": {
"type": "integer"
},
"complete": {
"type": "boolean"
}
}
}
}
},
"summary": {
"type": "string"
},
"warnings": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"enum": [
"fake_token",
"lookalike_address",
"tx_reverted",
"no_usdc_transfer",
"zero_value_transfer",
"bridged_usdbc"
],
"type": "string"
},
"message": {
"type": "string"
}
}
}
},
"confirmed": {
"type": "boolean"
},
"timestamp": {
"type": [
"string",
"null"
]
},
"settlement": {
"type": "object",
"properties": {
"note": {
"type": "string",
"description": "For settled: delivery/response by the seller cannot be verified on-chain"
},
"reason": {
"enum": [
"confirmed_onchain",
"pending_confirmation",
"authorization_used",
"tx_not_found",
"tx_reverted",
"no_usdc_transfer",
"zero_value_transfer",
"authorization_unused",
"authorization_unused_or_expired",
"authorization_unused_pending"
],
"type": "string"
},
"verdict": {
"enum": [
"settled",
"not_settled"
],
"type": "string"
}
},
"description": "Added field: did the payment settle on-chain?"
},
"attestation": {
"type": "object",
"description": "Signed response (EIP-191 by the key at /.well-known/attestation, not a wallet) over sha256 of this body minus attestation; present when signing is enabled"
},
"authorization": {
"type": "object",
"description": "Present when authorization was given: {from, nonce, used, chainTime, validBefore, expired}"
},
"confirmations": {
"type": "integer"
},
"usdcTransfers": {
"type": "array",
"items": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"amount": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}
},
"x402Version": 2
} Other captured 402 responses (4)
Captured payload 2 of 5
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://kertivo.com/check/deep",
"tags": [
"payment-verification",
"base",
"usdc",
"funding-source",
"full-history"
],
"mimeType": "application/json",
"description": "Did this USDC payment settle, and who funded this wallet (the payer)? Deep Base verification: confirmations, payTo/amount match, fake-token and lookalike warnings, plus the payer's FULL inbound USDC history (no window), top funders, coverage stats and a recheckable sha256 receipt. Not charged if the index is down. Body {txHash, expectedPayTo?, expectedAmount?}.",
"serviceName": "Kertivo deep payment verify"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"txHash": "0xc37cbdfa44230f05129348d5160254abf354791d79de68228b201ba09de143c1",
"expectedPayTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"expectedAmount": "1"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"mode": "live_paid_deep",
"block": 52409752,
"found": true,
"match": {
"ok": true,
"payToMatch": true,
"amountMatch": true
},
"funding": {
"source": "blockscout",
"verdict": "external",
"topFunders": [
{
"from": "0x86bafb3916943fbba78e7add6c25a230ec27df44",
"count": 2,
"total": "161.651325"
}
],
"scannedBlocks": {
"to": 52409752,
"from": 0,
"history": "full",
"complete": true,
"windowBlocks": 52409753
}
},
"payment": {
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"amount": "1"
},
"receipt": {
"reason": null,
"recheck": {
"hash": "0x…",
"hashAlg": "sha256(canonical JSON, keys sorted, no whitespace)",
"payload": {
"v": 2,
"chain": "eip155:8453",
"source": "blockscout",
"blockRange": {
"to": 52409752,
"from": 0
}
}
},
"verdict": "external",
"rpcCalls": 4,
"priceCharged": "0.05 USDC",
"blocksScanned": {
"to": 52409752,
"from": 0,
"complete": true
}
},
"summary": "1 USDC from 0xfc1e… to 0x509e… at block 52409752. Matches expected payment. Payer was funded externally.",
"coverage": {
"source": "blockscout",
"indexer": "blockscout pro (keyed)",
"complete": true,
"rpcCalls": 4,
"windowTo": 52409752,
"endpoints": [
"quicknode (keyed)"
],
"windowFrom": 0,
"coveragePct": 100,
"indexerPages": 1,
"windowBlocks": 52409753,
"blocksCovered": 52409753,
"getLogsChunks": 0,
"uniqueFunders": 1,
"historyComplete": true,
"inboundTransfers": 2
},
"warnings": [],
"confirmed": true,
"confirmations": 1200
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"properties": {
"txHash": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$",
"description": "Base mainnet transaction hash"
},
"authorization": {
"type": "object",
"required": [
"from",
"nonce"
],
"properties": {
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"nonce": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{64}$"
},
"validAfter": {
"type": [
"string",
"integer"
]
},
"validBefore": {
"type": [
"string",
"integer"
],
"description": "unix seconds"
}
},
"description": "Optional EIP-3009 authorization (x402 exact payload) to check when there is no tx or the tx is not found"
},
"expectedPayTo": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Expected recipient (full-address, case-insensitive compare)"
},
"selfAddresses": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 10,
"description": "Optional: other addresses you control; funding from them counts as self_funded"
},
"expectedAmount": {
"type": [
"string",
"number"
],
"description": "Expected USDC amount, decimal (e.g. \"0.01\")"
}
},
"description": "Provide txHash, or authorization (EIP-3009) when you have no tx hash, or both."
},
"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",
"required": [
"found",
"summary",
"mode",
"receipt"
],
"properties": {
"mode": {
"enum": [
"live_paid_deep"
],
"type": "string"
},
"block": {
"type": [
"integer",
"null"
]
},
"found": {
"type": "boolean"
},
"match": {
"type": [
"object",
"null"
],
"properties": {
"ok": {
"type": "boolean"
},
"payToMatch": {
"type": [
"boolean",
"null"
]
},
"amountMatch": {
"type": [
"boolean",
"null"
]
}
}
},
"status": {
"type": [
"string",
"null"
]
},
"funding": {
"type": [
"object",
"null"
],
"properties": {
"reason": {
"enum": [
"no_inbound_in_window",
"scan_incomplete"
],
"type": "string",
"description": "Only present when verdict=unknown"
},
"verdict": {
"enum": [
"external",
"self_funded",
"unknown"
],
"type": "string"
},
"topFunders": {
"type": "array"
},
"scannedBlocks": {
"type": "object",
"properties": {
"to": {
"type": "integer"
},
"from": {
"type": "integer"
},
"complete": {
"type": "boolean"
}
}
},
"payeeFundedPayer": {
"type": "boolean"
}
}
},
"payment": {
"type": [
"object",
"null"
],
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"amount": {
"type": "string"
}
}
},
"receipt": {
"type": "object",
"required": [
"blocksScanned",
"rpcCalls",
"priceCharged",
"verdict",
"reason"
],
"properties": {
"reason": {
"enum": [
"no_inbound_in_window",
"scan_incomplete",
null
],
"type": [
"string",
"null"
]
},
"verdict": {
"enum": [
"external",
"self_funded",
"unknown",
null
],
"type": [
"string",
"null"
]
},
"rpcCalls": {
"type": "integer"
},
"priceCharged": {
"type": "string",
"description": "'0.01 USDC' on /check, '0' on /demo"
},
"blocksScanned": {
"type": [
"object",
"null"
],
"properties": {
"to": {
"type": "integer"
},
"from": {
"type": "integer"
},
"complete": {
"type": "boolean"
}
}
}
}
},
"summary": {
"type": "string"
},
"coverage": {
"type": [
"object",
"null"
],
"properties": {
"source": {
"type": "string"
},
"indexer": {
"type": "string"
},
"complete": {
"type": "boolean"
},
"rpcCalls": {
"type": "integer"
},
"windowTo": {
"type": "integer"
},
"endpoints": {
"type": "array",
"items": {
"type": "string"
}
},
"windowFrom": {
"type": "integer"
},
"coveragePct": {
"type": "number"
},
"indexerMode": {
"type": "string"
},
"indexerPages": {
"type": "integer"
},
"windowBlocks": {
"type": "integer"
},
"blocksCovered": {
"type": "integer"
},
"uniqueFunders": {
"type": "integer"
},
"historyComplete": {
"type": "boolean"
},
"inboundTransfers": {
"type": "integer"
}
},
"description": "Deep scan coverage stats"
},
"warnings": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"enum": [
"fake_token",
"lookalike_address",
"tx_reverted",
"no_usdc_transfer",
"zero_value_transfer",
"bridged_usdbc"
],
"type": "string"
},
"message": {
"type": "string"
}
}
}
},
"confirmed": {
"type": "boolean"
},
"timestamp": {
"type": [
"string",
"null"
]
},
"settlement": {
"type": "object",
"properties": {
"note": {
"type": "string",
"description": "For settled: delivery/response by the seller cannot be verified on-chain"
},
"reason": {
"enum": [
"confirmed_onchain",
"pending_confirmation",
"authorization_used",
"tx_not_found",
"tx_reverted",
"no_usdc_transfer",
"zero_value_transfer",
"authorization_unused",
"authorization_unused_or_expired",
"authorization_unused_pending"
],
"type": "string"
},
"verdict": {
"enum": [
"settled",
"not_settled"
],
"type": "string"
}
},
"description": "Added field: did the payment settle on-chain?"
},
"attestation": {
"type": "object",
"description": "Signed response (EIP-191 by the key at /.well-known/attestation, not a wallet) over sha256 of this body minus attestation; present when signing is enabled"
},
"authorization": {
"type": "object",
"description": "Present when authorization was given: {from, nonce, used, chainTime, validBefore, expired}"
},
"confirmations": {
"type": "integer"
},
"usdcTransfers": {
"type": "array",
"items": {
"type": "object",
"properties": {
"to": {
"type": "string"
},
"from": {
"type": "string"
},
"amount": {
"type": "string"
}
}
}
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 3 of 5
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://kertivo.com/trust/lookup",
"tags": [
"x402",
"trust",
"reputation",
"api",
"verification"
],
"mimeType": "application/json",
"description": "Is this x402 API trustworthy? Body {url}. Returns its latest Kertivo Index endpoint trust score/grade (A, B, F, C-never-live, C-went-dark, or ungraded) and run date, plus evidence from a real paid test call: 402 status, price, payTo, settlement tx, on-chain check, HTTP status after paying, latency, schema and delivery result. Not in the index: status not_indexed. Also a public claims tally (buyer-filed disputed vs delivered), kept separate from the grade. Free grade-only: GET /trust/lookup?url=",
"serviceName": "Kertivo Index lookup"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://api.onesource.io/api/chain/erc20-balance"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"run": "x402 Trust Index #2",
"url": "https://api.onesource.io/api/chain/erc20-balance",
"grade": "A",
"status": "indexed",
"rawData": "https://paycheck.hectichustle.workers.dev/trust-index/raw.jsonl",
"runDate": "2026-10-12T04:01:29.345Z",
"evidence": {
"settled": true,
"unpaidStatus": 402,
"paymentTxHash": "0x0760d4ad46e5754d877e10a6473f84a0364b7d51d9d88603f407b0e201f30f47",
"priceSeenUSDC": 0.003,
"deliveryResult": "delivered_schema_ok",
"httpStatusAfterPay": 200
}
}
}
},
"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",
"description": "Absolute http(s) URL of the x402 endpoint (query string ignored)"
}
}
},
"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",
"required": [
"url",
"status",
"grade"
],
"properties": {
"run": {
"type": "string"
},
"url": {
"type": "string"
},
"grade": {
"type": [
"string",
"null"
]
},
"status": {
"enum": [
"indexed",
"not_indexed"
],
"type": "string"
},
"rawData": {
"type": "string"
},
"runDate": {
"type": [
"string",
"null"
]
},
"evidence": {
"type": "object",
"properties": {
"settled": {
"type": "boolean"
},
"unpaidStatus": {
"type": [
"integer",
"null"
]
},
"paymentTxHash": {
"type": [
"string",
"null"
]
},
"priceSeenUSDC": {
"type": [
"number",
"null"
]
},
"deliveryResult": {
"type": "string"
},
"httpStatusAfterPay": {
"type": [
"integer",
"null"
]
}
}
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 4 of 5
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://kertivo.com/address/check",
"tags": [
"base",
"usdc",
"security",
"address-poisoning",
"fraud"
],
"mimeType": "application/json",
"description": "Address-poisoning check before you send USDC on Base. Body {from, to} (or sender/recipient; optional chain=base; optional contacts/known_addresses): scans the sender's recent Base USDC transfers for addresses that share to's first 4 and last 4 hex chars but differ, plus dust or zero-value transfers from them. Returns risk low/medium/high, lookalikes with counts and sample tx, seenBefore (have you really paid 'to' before), reasons, and honest coverage stats (window, % scanned, complete).",
"serviceName": "Kertivo Shield"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"to": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"from": "0x9D42EbA8868CFd38A50Ba615ee0cf903F1BBeCE9"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"to": "0x509e55c4f898b43c856fb0e51048b1b7bfbc9ede",
"from": "0x9d42eba8868cfd38a50ba615ee0cf903f1bbece9",
"risk": "low",
"reasons": [
"you have paid 'to' before and no lookalikes found"
],
"coverage": {
"complete": false,
"rpcCalls": 47,
"scannedTo": 52518176,
"coveragePct": 38,
"lowCoverage": false,
"scannedFrom": 52468176,
"windowBlocks": 50000,
"transfersSeen": 19
},
"lookalikes": [],
"seenBefore": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"from",
"to"
],
"properties": {
"to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Intended recipient (aliases: recipient, toAddress)"
},
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Sender address (aliases: sender, fromAddress)"
},
"chain": {
"type": [
"string",
"integer"
],
"description": "Optional. Base only (base, eip155:8453, 8453). Any other chain returns 400 unsupported_chain and is not charged — Shield only scans Base USDC."
},
"contacts": {
"type": "array",
"items": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"maxItems": 50,
"description": "Optional: up to 50 trusted addresses / address book (aliases: known_addresses, known). 'to' is compared offline against them, so a lookalike of a contact is flagged even outside the scanned history."
}
}
},
"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",
"required": [
"risk",
"lookalikes",
"seenBefore",
"coverage"
],
"properties": {
"risk": {
"enum": [
"low",
"medium",
"high"
],
"type": "string"
},
"reasons": {
"type": "array",
"items": {
"type": "string"
}
},
"contacts": {
"type": "object",
"properties": {
"checked": {
"type": "integer"
},
"inContacts": {
"type": "boolean"
},
"lookalikes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"contact": {
"type": "string"
},
"prefixMatch": {
"type": "integer"
},
"suffixMatch": {
"type": "integer"
}
}
}
}
},
"description": "Only present when contacts were sent"
},
"coverage": {
"type": "object",
"properties": {
"complete": {
"type": "boolean"
},
"rpcCalls": {
"type": "integer"
},
"scannedTo": {
"type": "integer"
},
"coveragePct": {
"type": "number"
},
"lowCoverage": {
"type": "boolean",
"description": "true when coveragePct < 10: almost nothing was scanned, so risk low does not mean safe (top reason explains; retry, pass contacts, or use /address/check/full)"
},
"scannedFrom": {
"type": "integer"
},
"windowBlocks": {
"type": "integer"
},
"transfersSeen": {
"type": "integer"
}
}
},
"lookalikes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"address": {
"type": "string"
},
"inbound": {
"type": "integer"
},
"pattern": {
"enum": [
"dust_or_zero_value",
"lookalike_counterparty"
],
"type": "string"
},
"realOut": {
"type": "integer"
},
"outbound": {
"type": "integer"
},
"sampleTx": {
"type": "string"
},
"lastBlock": {
"type": "integer"
},
"dustTransfers": {
"type": "integer"
}
}
}
},
"seenBefore": {
"type": "boolean"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Captured payload 5 of 5
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x509E55c4F898B43C856Fb0E51048B1b7bFBC9eDE",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://kertivo.com/address/check/full",
"tags": [
"base",
"usdc",
"security",
"address-poisoning",
"full-history"
],
"mimeType": "application/json",
"description": "Full-history address-poisoning check before you send USDC on Base. Same risk/lookalike/seenBefore logic as /address/check, but funding history comes from ONE Blockscout index call (x402, up to the sender's 500 most recent Base USDC transfers; v2 page fallback) so coverage is usually the sender's full Base USDC history. Body {from, to}. Not charged if the index is down. Cheap partial/RPC tier: POST /address/check ($0.001).",
"serviceName": "Kertivo Shield (full)"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"to": "0xccd53f97ddfdf6939028698803dfe20fac455d07",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"to": "0xccd53f97ddfdf6939028698803dfe20fac455d07",
"from": "0xfc1e390266f3b29179b5d63a7937a689d1e5279a",
"mode": "live_paid_full",
"risk": "medium",
"reasons": [
"you have paid 'to' before, but 1 lookalike(s) also appear (poisoning attempt): keep using the full address you verified"
],
"coverage": {
"source": "blockscout",
"indexer": "blockscout x402 (paid page)",
"complete": true,
"rpcCalls": 1,
"windowTo": 52410000,
"scannedTo": 52410000,
"windowFrom": 0,
"coveragePct": 100,
"lowCoverage": false,
"scannedFrom": 0,
"indexerPages": 1,
"windowBlocks": 52410000,
"transfersSeen": 12,
"counterparties": 10,
"historyComplete": true
},
"lookalikes": [
{
"address": "0xccd560c57ca850ec6465008fdbc55d3b32b75d07",
"inbound": 0,
"pattern": "dust_or_zero_value",
"realOut": 0,
"outbound": 1,
"sampleTx": "0xf34c5e5ecd6a10e63133633f3d0108019f2667bd6c0557390e01dd6c8ca4ddd4",
"lastBlock": 52377228,
"dustTransfers": 1
}
],
"seenBefore": true,
"priceCharged": "0.005 USDC"
}
}
},
"schema": {
"type": "object",
"$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": [
"from",
"to"
],
"properties": {
"to": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Intended recipient (aliases: recipient, toAddress)"
},
"from": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Sender address (aliases: sender, fromAddress)"
},
"chain": {
"type": [
"string",
"integer"
],
"description": "Optional. Base only (base, eip155:8453, 8453). Any other chain returns 400 unsupported_chain and is not charged — Shield only scans Base USDC."
},
"contacts": {
"type": "array",
"items": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$"
},
"maxItems": 50,
"description": "Optional: up to 50 trusted addresses / address book (aliases: known_addresses, known). 'to' is compared offline against them, so a lookalike of a contact is flagged even outside the scanned history."
}
}
},
"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",
"required": [
"risk",
"lookalikes",
"seenBefore",
"coverage"
],
"properties": {
"risk": {
"enum": [
"low",
"medium",
"high"
],
"type": "string"
},
"reasons": {
"type": "array",
"items": {
"type": "string"
}
},
"contacts": {
"type": "object",
"properties": {
"checked": {
"type": "integer"
},
"inContacts": {
"type": "boolean"
},
"lookalikes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"contact": {
"type": "string"
},
"prefixMatch": {
"type": "integer"
},
"suffixMatch": {
"type": "integer"
}
}
}
}
},
"description": "Only present when contacts were sent"
},
"coverage": {
"type": "object",
"properties": {
"complete": {
"type": "boolean"
},
"rpcCalls": {
"type": "integer"
},
"scannedTo": {
"type": "integer"
},
"coveragePct": {
"type": "number"
},
"lowCoverage": {
"type": "boolean",
"description": "true when coveragePct < 10: almost nothing was scanned, so risk low does not mean safe (top reason explains; retry, pass contacts, or use /address/check/full)"
},
"scannedFrom": {
"type": "integer"
},
"windowBlocks": {
"type": "integer"
},
"transfersSeen": {
"type": "integer"
}
}
},
"lookalikes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"address": {
"type": "string"
},
"inbound": {
"type": "integer"
},
"pattern": {
"enum": [
"dust_or_zero_value",
"lookalike_counterparty"
],
"type": "string"
},
"realOut": {
"type": "integer"
},
"outbound": {
"type": "integer"
},
"sampleTx": {
"type": "string"
},
"lastBlock": {
"type": "integer"
},
"dustTransfers": {
"type": "integer"
}
}
}
},
"seenBefore": {
"type": "boolean"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Can I trust it score from our own monitoring
score from our own monitoring
89/100 Solid
#8 of 138 in Verification. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.
- Reliability
- 100% uptime since 10-14
- Compliance
- A 14/14 checks pass
- Price
- $0.001 to $0.05 p7 in Verification
- Risk
- clean no risk flag
- Traction
- $0.00 30d 0 buyers
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 2026-10-14. Last up 2026-10-14.
── 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, 100% uptime, latest daily rollup (no 30d window yet), 471ms response p95, x402 compliance 14 of 14, $0.001 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.
Traction is a conservative undercount.
All measured facts
What it does
Kertivo is the trust layer for bot-to-bot payments on Base USDC. Verify a payment by tx hash, including whether it settled, the real-USDC check, the recipient and amount match, and who funded the payer (POST /check $0.01; /check/deep $0.05 for wider funding history). Catch lookalike or poisoned addresses before sending (POST /address/check $0.001; /address/check/full $0.005). Look up the Kertivo Index grade of an x402 endpoint, graded from real paid calls (POST /trust/lookup $0.002). Responses are signed. There is a free demo at POST /demo, and a free buyer claims desk at /claims.
Kertivo 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: 2026-09-15 to 2026-10-14 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. 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
- -
- uptime 7d
- -
- uptime 30d
- -
- uptime 90d
- -
- response p95
- 471ms
- avg response
- 471ms
- total checks
- 1
Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.
- price (min)
- $0.001
- price (max)
- $0.05
- category percentile (min)
- p7 in Verification
- category percentile (max)
- p46 in Verification
- endpoints / prices
- 5 / 5
- model
- tiered
- stability
- 100%
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
- -
- registrar
- -
- hosting
- custom
- domain created
- ---
Identity facts, not a risk score.
- assessment volume 30d
- $0.00
- exact assessment volume 30d (USD)
- 0
- assessment recorded at (UTC)
- 2026-10-14T13:53:09.592Z
- buyers 30d
- 0
- settlements 30d
- 0
- measured since
- --- (start of our harvest window)
- last settlement
- ---
- top buyer share
- -
- top 3 buyers share
- -
- concentrated volume
- no
- trend 7d vs 30d
- -
- networks
- eip155:8453
- volume all-time
- $0
- settlements all-time
- 0
- median settlement 30d
- -
- max settlement 30d
- -
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
- 2026-10-14
Recent checks
| Checked at (UTC) | Status | HTTP | Response | Endpoints |
|---|---|---|---|---|
| Online | 402 | 451ms | 5 | |
| Online | 402 | 236ms | 5 | |
| Online | 402 | 254ms | 5 | |
| Online | 402 | 228ms | 5 | |
| Online | 402 | 130ms | 5 | |
| Online | 402 | 280ms | 5 | |
| Online | 402 | 313ms | 5 | |
| Online | 402 | 165ms | 5 | |
| Online | 402 | 214ms | 5 | |
| Online | 402 | 369ms | 5 | |
| Online | 402 | 432ms | 5 | |
| Online | 402 | 403ms | 5 | |
| Online | 402 | 471ms | 5 |
Changes0 in 30d
No changes recorded in the last 30 days.
Over time
On-chain volume daily snapshots, USD 30d: $0.00, peak $1.00 on 10-10
volume
Distinct buyers per dayDistinct buyers per day
Uptime no completed-day data
- Volume 30d
- $0.00
- Uptime
- no completed-day data
More charts
Response time daily average, ms min 304ms, avg 304ms, max 304ms
09-15 to 10-14* UTC
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: $1.45, peak $1.00 on 10-10. 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: 2026-09-15 to 2026-10-14 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 |
|---|---|---|---|---|---|---|---|---|
| 2026-10-10 | $1.00 | 1 | 1 | no data | no data | no data | no data | no data |
| 2026-10-11 | $0.05 | 3 | 6 | no data | no data | no data | no data | no data |
| 2026-10-12 | $0.17 | 3 | 15 | no data | no data | no data | no data | no data |
| 2026-10-13 | $0.13 | 3 | 21 | no data | no data | no data | no data | no data |
| 2026-10-14* | $0.10 | 3 | 14 | 100% | 303.54ms | 14/14 | p7 | 4/6 |
Alternatives in Verification
5 of 137 other ranked services in Verification, ordered by the same measured score.
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Delisting
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