Roundhouse

Verification Oracle

Machine-payable verification and research services for AI agents. Signed results, per-call pricing, no accounts. x402 on Base.

TradingLiveeip155:8453Exactvia cdp
https://attester.dev/verify
VerificationAttestationAgentsTrustAudit
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 snapshots so far.
$2.04
Verified settled volume
39 settlements proven x402 by their on-chain EIP-3009 marker.
$0.150
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-01 13:45Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x57407D691F755cAa107647718F3582a8A87467dD

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.

{
  "docs": "https://attester.dev/llms.txt",
  "policy": "https://attester.dev/policy",
  "sample": {
    "input": {
      "job": {
        "type": "citation",
        "claim": "Python was created by Guido van Rossum",
        "sources": [
          "https://en.wikipedia.org/wiki/Python_(programming_language)"
        ]
      }
    },
    "output": {
      "verdict": "pass",
      "evidence": [
        {
          "url": "https://en.wikipedia.org/wiki/Python_(programming_language)",
          "score": 0.8,
          "excerpt": "Python (programming language) - Wikipedia Jump to content Main menu Main menu move to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search",
          "fetched": true,
          "verdict": "supports",
          "coverage": 1,
          "proximity": 0.2,
          "http_status": 200,
          "matched_terms": [
            "created",
            "guido",
            "python",
            "rossum",
            "van"
          ]
        }
      ],
      "signature": "0x8ac094af3563150ba9c3c4f9120bd567c29df000dc44e47e29ab97f80a948a6c53938c3be4581f12d5c8783a794190aab536756f1fd8bb2340fc3067631652eb1c",
      "confidence": 0.8,
      "attestation": {
        "verdict": "pass",
        "spec_hash": "0xe307db4b2d79b1576e5f1a5f27a83dce8e949c0b88bd8bed4dbf5fb58a96b7b2",
        "timestamp": "2026-09-02T07:17:40.297843+00:00",
        "confidence": 0.8,
        "response_hash": "0xc068315bb1179607813981f6f1db48e666955be50221720d7658a8c8516da0e2",
        "evidence_hashes": [
          "0x0c69c0d93a4f5fec7b33b64588916cd090c1d1c71cef7e557068269e6910b742"
        ],
        "service_version": "0.3.0",
        "verifier_address": "0x31520f9c14360470040807fAba64938ebcfF9C8f"
      },
      "served_in_ms": 387,
      "attestation_hash": "0x4518621c2c7901917ae636c40e798fd37a3adaa9d6c5459ee0430a5d26d459d6"
    },
    "example": false
  },
  "message": "Payment required. Free samples are available to evaluate this service first.",
  "traction": {
    "metrics": "https://attester.dev/metrics",
    "uptime_pct_30d": 99.98,
    "external_buyers": 6,
    "public_scoreboard": "https://x402-list.com/services/attester-verification-oracle-verified-research"
  },
  "free_demos": {
    "diff": "https://attester.dev/demo/v1/diff",
    "verify": "https://attester.dev/demo/verify",
    "mcp_pin": "https://attester.dev/v2/mcp/pin",
    "code_research": "https://attester.dev/demo/code-research",
    "symbol_exists": "https://attester.dev/demo/v1/symbol/exists",
    "package_exists": "https://attester.dev/demo/v1/package/exists",
    "symbol_signature": "https://attester.dev/demo/v1/symbol/signature"
  },
  "free_quota": "send an X-Payer header (any wallet address) for free calls per endpoint",
  "related_checks": [
    {
      "endpoint": "/code-research",
      "price_usd": "0.10"
    },
    {
      "endpoint": "/judge",
      "price_usd": "0.10"
    }
  ]
}

Accepts

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

0.15USDC≈ $0.15 USD
on Base · exact scheme

Pay 0.15 USDC on Base to 0x5740…467dD. The signed payment is good for 5 minutes.

Paid to
0x5740…467dD
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
150000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x57407D691F755cAa107647718F3582a8A87467dD",
    "amount": "150000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "job": {
            "type": "citation",
            "claim": "Python was created by Guido van Rossum",
            "sources": [
              "https://en.wikipedia.org/wiki/Python_(programming_language)"
            ]
          }
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "verdict": "pass",
          "signature": "0x…",
          "confidence": 0.83,
          "attestation": {
            "service_version": "0.2.0",
            "verifier_address": "0x31520f9c14360470040807fAba64938ebcfF9C8f"
          }
        }
      }
    },
    "schema": {
      "$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": [
                "job"
              ],
              "properties": {
                "job": {
                  "type": "object",
                  "required": [
                    "type"
                  ],
                  "properties": {
                    "type": {
                      "enum": [
                        "citation",
                        "code",
                        "data"
                      ],
                      "type": "string"
                    },
                    "claim": {
                      "type": "string"
                    },
                    "sources": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      }
                    }
                  },
                  "description": "Verification job: citation support check, data/schema validation"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "example"
          ],
          "properties": {
            "example": {
              "type": "object"
            }
          }
        }
      }
    },
    "category": "ai",
    "discoverable": true
  }
}

Provenance

Seen in the source catalog
2026-08-01 13:45Z
Last indexed by Roundhouse
2026-08-31 13:10Z
Last enriched (probe, favicon, geo)
2026-09-10 10:45Z
x402 version
2
Max timeout
300s
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. 8 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 Verification Oracle 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=Verification%20Oracle'
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://attester.dev/verify, 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.