Roundhouse AI

FractalAI Notary

The first AI-native Layer 1 blockchain built from scratch in Rust. Post-quantum cryptography (CRYSTALS-Dilithium), Proof of Fractal Work consensus, WASM smart contracts, and 460+ RPC endpoints. Mine FRAC tokens with fractal analysis instead of hash puzzles.

InferenceLiveeip155:8453Exactvia cdp
https://fractalai.net.co/api/x402/attest-decision
Ai-provenanceDecisionAuditEu-ai-actOn-chain
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 9 snapshots so far.
$1.09
Verified settled volume
52 settlements proven x402 by their on-chain EIP-3009 marker.
$0.050
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-15 15:46Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xC13789e82661635d9Cea38a53A0390CF9939ef4f

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",
  "price": "$0.05",
  "usage": "POST { agent_id, input, output, model_id?, model_version? }. First call → 402 with `accepts` (facilitator EIP-3009 gasless, or pay-first txHash). Facilitator-native: retry with X-PAYMENT = base64(JSON(exact-scheme payload with a signed EIP-3009 authorization)). Fallback: retry with X-PAYMENT = base64(JSON({ txHash })). Returns a re-verifiable attestation (Dilithium-2 signed, Black-Box chained, VAID-1 anchored). Re-verify later via GET /api/blackbox?agent_id=…&verify=1.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "decimals": 6,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USDC",
        "decimals": 6,
        "settlement": "txHash",
        "instructions": "Facilitator-less: send exactly `amount` USDC to `payTo` on Base, then retry with PAYMENT-SIGNATURE = base64(JSON({ txHash })) (X-PAYMENT also accepted)."
      },
      "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
      "amount": "50000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "service": "FractalAI x402 Pay-per-Attestation — seal an AI decision in a post-quantum L1 for autonomous agents",
  "resource": {
    "url": "https://fractalai.net.co/api/x402/attest-decision",
    "tags": [
      "ai-provenance",
      "decision",
      "audit",
      "eu-ai-act",
      "on-chain"
    ],
    "mimeType": "application/json",
    "description": "Pay-per-Attestation: an AI agent pays to seal its own decision (input hash, output, model, timestamp) in FractalAI's post-quantum L1 — Dilithium-2 (NIST FIPS 204) signed, Black-Box chained, on-chain anchored (VAID-1). Returns a re-verifiable receipt. Built for EU AI Act Art.12 record-keeping. x402-native.",
    "serviceName": "FractalAI Notary"
  },
  "extensions": {
    "bazaar": {
      "body": {
        "input": "ctx",
        "output": "decision",
        "agent_id": "agent-42"
      },
      "info": {
        "input": {
          "body": {
            "input": "ctx",
            "output": "decision",
            "agent_id": "agent-42"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "algorithm": "ml-dsa-65",
            "permalink": "https://fractalai.net.co/attestation/0x…",
            "signature": "BASE64_ML_DSA65",
            "attestation_hash": "0x…"
          }
        }
      },
      "tags": [
        "ai-provenance",
        "decision",
        "audit",
        "eu-ai-act",
        "on-chain"
      ],
      "type": "http",
      "method": "POST",
      "output": {
        "type": "json",
        "schema": {
          "type": "object",
          "required": [
            "entry_hash",
            "input_hash",
            "output_hash",
            "signature",
            "public_key"
          ],
          "properties": {
            "seq": {
              "type": "number",
              "description": "Append-only sequence number of this decision in the agent Black Box."
            },
            "payment": {
              "type": "object",
              "description": "Settlement receipt (scheme, network, asset, txHash, payer, settled)."
            },
            "algorithm": {
              "type": "string",
              "description": "ml-dsa-65 (the served signature algorithm)."
            },
            "permalink": {
              "type": "string",
              "description": "Permalink to the on-chain Dilithium-2 anchor (VAID-1), when the L1 anchor succeeds."
            },
            "prev_hash": {
              "type": "string",
              "description": "Hash of the previous Black Box entry this one is chained to (tamper-evident order)."
            },
            "signature": {
              "type": "string",
              "description": "Base64 ML-DSA-65 / Dilithium-3 (NIST FIPS 204) SERVED signature (3309 bytes) over the EXACT bytes echoed in `signed_message` = FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical decision message)> (route-separated, 3 lines). Verify offline: ml_dsa65.verify(b64(signature), utf8(signed_message), b64(public_key))."
            },
            "entry_hash": {
              "type": "string",
              "description": "Black Box entry hash: sha256 of the chained, canonical decision content."
            },
            "input_hash": {
              "type": "string",
              "description": "sha256 of the declared input."
            },
            "public_key": {
              "type": "string",
              "description": "Base64 ML-DSA-65 public key (1952 bytes) that verifies the served signature."
            },
            "output_hash": {
              "type": "string",
              "description": "sha256 of the declared output."
            },
            "signed_message": {
              "type": "string",
              "description": "The EXACT UTF-8 bytes the served signature covers (FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical)>). Pass verbatim to ml_dsa65.verify."
            },
            "entry_signature": {
              "type": "string",
              "description": "Base64 Dilithium-2 (NIST FIPS 204) signature over the Black-Box entry hash — the chained on-chain-anchored seal."
            },
            "attestation_hash": {
              "type": "string",
              "description": "On-chain (VAID-1) attestation hash — re-verifiable proof the decision was sealed."
            },
            "entry_public_key": {
              "type": "string",
              "description": "Base64 Dilithium-2 public key that verifies entry_signature."
            }
          }
        },
        "example": {
          "algorithm": "ml-dsa-65",
          "permalink": "https://fractalai.net.co/attestation/0x…",
          "signature": "BASE64_ML_DSA65",
          "attestation_hash": "0x…"
        }
      },
      "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",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      },
      "bodyType": "json",
      "route_key": "POST /api/x402/attest-decision",
      "description": "Pay-per-Attestation: an AI agent pays to seal its own decision (input hash, output, model, timestamp) in FractalAI's post-quantum L1 — Dilithium-2 (NIST FIPS 204) signed, Black-Box chained, on-chain anchored (VAID-1). Returns a re-verifiable receipt. Built for EU AI Act Art.12 record-keeping. x402-native.",
      "serviceName": "FractalAI Notary"
    }
  },
  "x402Version": 2
}

Accepts

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

0.05USDC≈ $0.05 USD
on Base · exact scheme

Pay 0.05 USDC on Base to 0xC137…9ef4f. The signed payment is good for 5 minutes.

Paid to
0xC137…9ef4f
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
50000 smallest units
0.05USDC≈ $0.05 USD
on Base · exact scheme

Pay 0.05 USDC on Base to 0xC137…9ef4f. The signed payment is good for 5 minutes.

Paid to
0xC137…9ef4f
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
50000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "decimals": 6,
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USDC",
      "decimals": 6,
      "settlement": "txHash",
      "instructions": "Facilitator-less: send exactly `amount` USDC to `payTo` on Base, then retry with PAYMENT-SIGNATURE = base64(JSON({ txHash })) (X-PAYMENT also accepted)."
    },
    "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
    "amount": "50000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "body": {
      "input": "ctx",
      "output": "decision",
      "agent_id": "agent-42"
    },
    "info": {
      "input": {
        "body": {
          "input": "ctx",
          "output": "decision",
          "agent_id": "agent-42"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "algorithm": "ml-dsa-65",
          "permalink": "https://fractalai.net.co/attestation/0x…",
          "signature": "BASE64_ML_DSA65",
          "attestation_hash": "0x…"
        }
      }
    },
    "tags": [
      "ai-provenance",
      "decision",
      "audit",
      "eu-ai-act",
      "on-chain"
    ],
    "type": "http",
    "method": "POST",
    "output": {
      "type": "json",
      "schema": {
        "type": "object",
        "required": [
          "entry_hash",
          "input_hash",
          "output_hash",
          "signature",
          "public_key"
        ],
        "properties": {
          "seq": {
            "type": "number",
            "description": "Append-only sequence number of this decision in the agent Black Box."
          },
          "payment": {
            "type": "object",
            "description": "Settlement receipt (scheme, network, asset, txHash, payer, settled)."
          },
          "algorithm": {
            "type": "string",
            "description": "ml-dsa-65 (the served signature algorithm)."
          },
          "permalink": {
            "type": "string",
            "description": "Permalink to the on-chain Dilithium-2 anchor (VAID-1), when the L1 anchor succeeds."
          },
          "prev_hash": {
            "type": "string",
            "description": "Hash of the previous Black Box entry this one is chained to (tamper-evident order)."
          },
          "signature": {
            "type": "string",
            "description": "Base64 ML-DSA-65 / Dilithium-3 (NIST FIPS 204) SERVED signature (3309 bytes) over the EXACT bytes echoed in `signed_message` = FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical decision message)> (route-separated, 3 lines). Verify offline: ml_dsa65.verify(b64(signature), utf8(signed_message), b64(public_key))."
          },
          "entry_hash": {
            "type": "string",
            "description": "Black Box entry hash: sha256 of the chained, canonical decision content."
          },
          "input_hash": {
            "type": "string",
            "description": "sha256 of the declared input."
          },
          "public_key": {
            "type": "string",
            "description": "Base64 ML-DSA-65 public key (1952 bytes) that verifies the served signature."
          },
          "output_hash": {
            "type": "string",
            "description": "sha256 of the declared output."
          },
          "signed_message": {
            "type": "string",
            "description": "The EXACT UTF-8 bytes the served signature covers (FRACTALAI-x402-served-v1\\nx402-attest-decision\\n<sha256(canonical)>). Pass verbatim to ml_dsa65.verify."
          },
          "entry_signature": {
            "type": "string",
            "description": "Base64 Dilithium-2 (NIST FIPS 204) signature over the Black-Box entry hash — the chained on-chain-anchored seal."
          },
          "attestation_hash": {
            "type": "string",
            "description": "On-chain (VAID-1) attestation hash — re-verifiable proof the decision was sealed."
          },
          "entry_public_key": {
            "type": "string",
            "description": "Base64 Dilithium-2 public key that verifies entry_signature."
          }
        }
      },
      "example": {
        "algorithm": "ml-dsa-65",
        "permalink": "https://fractalai.net.co/attestation/0x…",
        "signature": "BASE64_ML_DSA65",
        "attestation_hash": "0x…"
      }
    },
    "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",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "headers": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    },
    "bodyType": "json",
    "route_key": "POST /api/x402/attest-decision",
    "description": "Pay-per-Attestation: an AI agent pays to seal its own decision (input hash, output, model, timestamp) in FractalAI's post-quantum L1 — Dilithium-2 (NIST FIPS 204) signed, Black-Box chained, on-chain anchored (VAID-1). Returns a re-verifiable receipt. Built for EU AI Act Art.12 record-keeping. x402-native.",
    "serviceName": "FractalAI Notary"
  }
}

Provenance

Seen in the source catalog
2026-09-15 15:46Z
Last indexed by Roundhouse
2026-09-24 14:50Z
Last enriched (probe, favicon, geo)
2026-09-15 19:45Z
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. 9 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 FractalAI Notary 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=FractalAI%20Notary'
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://fractalai.net.co/api/x402/attest-decision, 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.