Roundhouse AI

Rubric Protocol

Prove your AI followed the rules — without exposing your models or data. Rubric creates tamper-evident, independently verifiable audit trails for every AI decision.

MediaLiveeip155:8453Exactvia cdp
https://rubric-protocol.com/v1/x402/statement
BillingStatementAudit
Calls · 30d
7↑ 11%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$37.26
Verified settled volume
886 settlements proven x402 by their on-chain EIP-3009 marker.
$0.500
Listed price
As published in the catalog. Always read the live 402 before paying.
7
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-09-21 14:16Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xaB6731A0BcDf511c2842C768a03448075aB654ca

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "Payment required: POST with PAYMENT-SIGNATURE header",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xaB6731A0BcDf511c2842C768a03448075aB654ca",
      "amount": "500000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    }
  ],
  "contact": "/contact?topic=x402",
  "gateway": "/docs.html#specifications",
  "resource": {
    "url": "https://rubric-protocol.com/v1/x402/statement",
    "tags": [
      "billing",
      "statement",
      "audit"
    ],
    "iconUrl": "https://rubric-protocol.com/favicon.ico",
    "mimeType": "application/json",
    "description": "Signed monthly x402 spend statement for one agent: totals, per-payment lines, Merkle root. The statement is itself an ML-DSA-65 attestation anchored to Hedera mainnet HCS. Render, verify, and print the response free at https://rubric-protocol.com/statement.html",
    "serviceName": "Rubric Protocol"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "format": "json",
            "period": "2026-07",
            "agentId": "acme-underwriter-01"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "paid": true,
            "lines": [],
            "settled": true,
            "success": true,
            "algorithm": "ML-DSA-65",
            "statement": {
              "period": "2026-07",
              "totalUsd": 1.23,
              "merkleRoot": "0x…"
            },
            "verifyUrl": "https://rubric-protocol.com/v1/verify/att_…",
            "attestationId": "att_…"
          }
        }
      },
      "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"
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "format": {
                "type": "string"
              },
              "example": {}
            },
            "additionalProperties": false
          }
        }
      },
      "discoverable": true
    }
  },
  "x402Version": 2,
  "outputSchema": {
    "input": {
      "type": "http",
      "method": "POST",
      "bodyType": "json",
      "bodyFields": {
        "format": "string (optional) - 'json' (default) or 'csv'",
        "period": "string (required) - YYYY-MM",
        "agentId": "string (required) - agent whose spend to report"
      }
    },
    "output": {
      "paid": "boolean",
      "lines": "array - per-payment ledger lines",
      "topic": "string",
      "settled": "boolean",
      "success": "boolean",
      "algorithm": "ML-DSA-65",
      "statement": "object - totals, period, merkleRoot",
      "verifyUrl": "string - free public verification",
      "attestationId": "string"
    }
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.5USDC≈ $0.5 USD
on Base · exact scheme

Pay 0.5 USDC on Base to 0xaB67…654ca. The signed payment is good for 2 minutes.

Paid to
0xaB67…654ca
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
500000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xaB6731A0BcDf511c2842C768a03448075aB654ca",
    "amount": "500000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "format": "json",
          "period": "2026-07",
          "agentId": "acme-underwriter-01"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "paid": true,
          "lines": [],
          "settled": true,
          "success": true,
          "algorithm": "ML-DSA-65",
          "statement": {
            "period": "2026-07",
            "totalUsd": 1.23,
            "merkleRoot": "0x…"
          },
          "verifyUrl": "https://rubric-protocol.com/v1/verify/att_…",
          "attestationId": "att_…"
        }
      }
    },
    "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"
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "format": {
              "type": "string"
            },
            "example": {}
          },
          "additionalProperties": false
        }
      }
    },
    "discoverable": true
  }
}

Provenance

Seen in the source catalog
2026-09-21 14:16Z
Last indexed by Roundhouse
2026-09-25 11:30Z
Last enriched (probe, favicon, geo)
2026-09-23 22:15Z
x402 version
2
Max timeout
120s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service Rubric Protocol and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Rubric%20Protocol'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://rubric-protocol.com/v1/x402/statement, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.