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x402 Protocol Service Directory

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Rubric Protocol — Post-Quantum AI Attestation

Verification

Pay-per-call post-quantum attestation for AI decisions. Each call mints one ML-DSA-65 (FIPS 204) signed attestation anchored to Hedera mainnet HCS, with free public verification via verifyUrl. x402 v2, $0.005 USDC on Base.

Pay from $0.005 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

listed 2026-07-25 · no on-chain settlement recorded yet

BASE URL https://rubric-protocol.com │ WEBSITE https://rubric-protocol.com │ ENDPOINTS 1 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-07-25 │ MONITORED SINCE 2026-07-25

ASSESSMENT

updated 3h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%
uptime 24h
-
uptime 7d
-
uptime 30d
-
uptime 90d
-
response p95
657ms
avg response
657ms
total checks
1
compliance A (11/11)

11 of 11 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.005 (p47 in Verification)
price (min)
$0.005
category percentile (min)
p47 in Verification
endpoints / prices
1 / 1
model
flat
stability
100%
risk clean

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
138d
registrar
GoDaddy.com, LLC
hosting
custom
domain created
2026-03-08

Identity facts, not a risk score.

traction $0 30d · 0 buyers
volume 30d
$0
buyers 30d
0
settlements 30d
0
first settlement
---
last settlement
---
top buyer share
-
trend 7d vs 30d
-
networks
eip155:8453
volume all-time
$0
settlements all-time
0
median settlement 30d
$0
max settlement 30d
$0
settled via
-

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

Provides post-quantum AI attestation services with tamper-evident verification on Hedera mainnet

category
ai-attestation
in
body
attestationverificationpost-quantumaiblockchain

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET
POST /v1/x402/tiered-attest $0.005 Base USDC
1 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /v1/x402/tiered-attest returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i -X POST 'https://rubric-protocol.com/v1/x402/tiered-attest'
// 402 response (captured by monitor) · 1 payload · click to expand 
[
  {
    "error": "PAYMENT-SIGNATURE header is required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0xaB6731A0BcDf511c2842C768a03448075aB654ca",
        "amount": "5000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 120
      }
    ],
    "resource": {
      "url": "https://rubric-protocol.com/v1/x402/tiered-attest",
      "mimeType": "application/json",
      "description": "Tamper-evident audit log record for an AI agent decision: signed compliance evidence anchored to public consensus for independent verification. Post-quantum ML-DSA-65 (FIPS 204) signature, Hedera mainnet HCS anchor, free public verification — for agent action provenance, audit trails, and AI governance evidence."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "data": "object (optional) — attested content",
              "agentId": "string (optional)"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "paid": "boolean",
              "topic": "string",
              "settled": "boolean",
              "success": "boolean",
              "algorithm": "ML-DSA-65",
              "verifyUrl": "string — free public verification",
              "attestationId": "string"
            }
          }
        },
        "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": {
                    "data": {
                      "type": "object",
                      "description": "Content to attest"
                    },
                    "agentId": {
                      "type": "string",
                      "description": "Caller-supplied agent identifier"
                    }
                  }
                },
                "type": {
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ]
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ]
                }
              }
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                }
              }
            }
          }
        },
        "discoverable": true
      }
    },
    "x402Version": 2,
    "outputSchema": {
      "input": {
        "type": "http",
        "method": "POST",
        "bodyType": "json",
        "bodyFields": {
          "data": "object (optional) — attested content",
          "agentId": "string (optional)"
        }
      },
      "output": {
        "paid": "boolean",
        "topic": "string",
        "settled": "boolean",
        "success": "boolean",
        "algorithm": "ML-DSA-65",
        "verifyUrl": "string — free public verification",
        "attestationId": "string"
      }
    }
  }
]

OVER TIME

All charts share the 24h window selected here. Every series is also served as JSON at /api/v1/services/rubric-protocol-post-quantum-ai-attestation/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
07-25 · uptime 100.0% · 710ms avg07-2507-25
24h UPTIME 100%
RESPONSE TIME
07-25 · 710ms avg07-25 · 710ms avg07-2507-25
AVG RESP 742ms
PRICE (captured 402, USD)
building price history ($0.005)
SUB-SCORES (uptime + x402 compliance)
building assessment history (1 day so far)
VOLUME (on-chain settlement, USD)
building volume history (1 day so far)
DISTINCT BUYERS
building buyer history (1 day so far)

COMPLIANCE

11/11 checks pass · grade A
  • 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

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (13) · click to expand
TIME STATUS RESP
● OK 361ms
● SLOW 1489ms
● OK 474ms
● OK 927ms
● OK 878ms
● OK 564ms
● OK 375ms
● SLOW 1434ms
● OK 451ms
● SLOW 1122ms
● OK 443ms
● OK 470ms
● OK 657ms
13 of 13 checks

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