Roundhouse AI

FractalAI x402 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.

OtherLiveeip155:8453Exactvia cdp
https://fractalai.net.co/api/x402/witness
WitnessNotaryPost-quantumMl-dsa-65x402
Calls · 30d
4
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.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
4
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-09-19 16:00Z
—
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": "$0.005",
  "usage": "POST { seal_body }. First call → 402. Retry with X-PAYMENT (EIP-3009 gasless). Independently re-derives the claimed transfer from Base RPC before signing when seal_body.transaction is present.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "decimals": 6,
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
      "amount": "5000",
      "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": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "service": "FractalAI Notary — independent ML-DSA-65 attestation of x402 settlements, any resource",
  "resource": {
    "url": "https://fractalai.net.co/api/x402/witness",
    "tags": [
      "witness",
      "notary",
      "post-quantum",
      "ml-dsa-65",
      "x402"
    ],
    "mimeType": "application/json",
    "description": "FractalAI Notary: pay for an independent ML-DSA-65 attestation of an x402 settlement.",
    "serviceName": "FractalAI x402 Notary"
  },
  "extensions": {
    "bazaar": {
      "body": {
        "seal_body": {
          "payer": "0x…",
          "amount": "20000",
          "network": "eip155:8453",
          "resource": "https://example.com/api/x402/thing",
          "transaction": "0x…"
        }
      },
      "info": {
        "input": {
          "body": {
            "seal_body": {
              "payer": "0x…",
              "amount": "20000",
              "network": "eip155:8453",
              "resource": "https://example.com/api/x402/thing",
              "transaction": "0x…"
            }
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "seal": {
              "algorithm": "ml-dsa-65",
              "signature": "…",
              "content_id": "…"
            }
          }
        }
      },
      "tags": [
        "witness",
        "notary",
        "post-quantum",
        "ml-dsa-65",
        "x402"
      ],
      "type": "http",
      "method": "POST",
      "output": {
        "type": "json",
        "schema": {
          "type": "object",
          "required": [
            "seal"
          ],
          "properties": {
            "seal": {
              "type": "object",
              "description": "Independently FractalAI-signed ML-DSA-65 attestation of the settlement."
            },
            "payment": {
              "type": "object",
              "description": "This call's own settlement receipt."
            }
          }
        },
        "example": {
          "seal": {
            "algorithm": "ml-dsa-65",
            "signature": "…",
            "content_id": "…"
          }
        }
      },
      "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/witness",
      "description": "FractalAI Notary: pay for an independent ML-DSA-65 attestation of an x402 settlement.",
      "serviceName": "FractalAI x402 Notary"
    }
  },
  "x402Version": 2,
  "notary_domain": "FRACTALAI-x402-served-v1\nx402-witness",
  "notary_public_key": "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"
}

Accepts

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

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 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
5000 smallest units
0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 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
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "decimals": 6,
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0xC13789e82661635d9Cea38a53A0390CF9939ef4f",
    "amount": "5000",
    "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": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "body": {
      "seal_body": {
        "payer": "0x…",
        "amount": "20000",
        "network": "eip155:8453",
        "resource": "https://example.com/api/x402/thing",
        "transaction": "0x…"
      }
    },
    "info": {
      "input": {
        "body": {
          "seal_body": {
            "payer": "0x…",
            "amount": "20000",
            "network": "eip155:8453",
            "resource": "https://example.com/api/x402/thing",
            "transaction": "0x…"
          }
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "seal": {
            "algorithm": "ml-dsa-65",
            "signature": "…",
            "content_id": "…"
          }
        }
      }
    },
    "tags": [
      "witness",
      "notary",
      "post-quantum",
      "ml-dsa-65",
      "x402"
    ],
    "type": "http",
    "method": "POST",
    "output": {
      "type": "json",
      "schema": {
        "type": "object",
        "required": [
          "seal"
        ],
        "properties": {
          "seal": {
            "type": "object",
            "description": "Independently FractalAI-signed ML-DSA-65 attestation of the settlement."
          },
          "payment": {
            "type": "object",
            "description": "This call's own settlement receipt."
          }
        }
      },
      "example": {
        "seal": {
          "algorithm": "ml-dsa-65",
          "signature": "…",
          "content_id": "…"
        }
      }
    },
    "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/witness",
    "description": "FractalAI Notary: pay for an independent ML-DSA-65 attestation of an x402 settlement.",
    "serviceName": "FractalAI x402 Notary"
  }
}

Provenance

Seen in the source catalog
2026-09-19 16:00Z
Last indexed by Roundhouse
2026-09-24 12:50Z
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 x402 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%20x402%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/witness, 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.