MERCURY Notarize API

openapi: 3.2.0
info:
  title: MERCURY x402 storefront Notarize API
  version: '1'
  x-spec: mercury-storefront/1
  description: Agent-payable resources over HTTP 402 (x402). LIVE — Base mainnet, real USDC, no token. Only currently-deliverable routes are listed (web-fetch is the live paid SKU; mints are gated off). Free discovery at /.well-known/x402, /x402/discovery, /catalog, and /manifest.
servers:
- url: https://network.mercury-hq.com
tags:
- name: notarize
paths:
  /buy/notarize:
    get:
      summary: MERCURY Cited Notarize
      description: 'Notarize any content (inline ?content= or a fetched ?url=) into a signed, offline-verifiable provenance receipt — sha256 contentHash + witnessed timestamp, attested by Mercury''s pinned key. Deterministic, keyless, no LLM. The signed receipt is the product: it witnesses that these exact bytes existed in this exact form at this time (the one thing your own sha256() can''t — a third-party witness).'
      operationId: buy_cited_notarize
      tags:
      - notarize
      responses:
        '200':
          description: Delivered after the x402 payment settles on Base mainnet.
          content:
            application/json:
              schema:
                type: object
                properties:
                  ok:
                    type: boolean
                    description: true on success; false on an honest failure (never charged)
                  url:
                    type: string
                    description: echo of the notarized source identifier (the url, or 'inline:content')
                  status:
                    type: integer
                    description: 200 on success; upstream status when a fetched url failed
                  text:
                    type: string
                    description: the CANONICAL notarization statement — the exact string the seller's EIP-191 receipt signs over. Newline-joined, fixed field order, reconstructable byte-for-byte for offline verification.
                  data:
                    type: object
                    description: the structured notarization record the buyer consumes
                    properties:
                      algorithm:
                        type: string
                        description: the content-hash algorithm (sha256)
                      contentHash:
                        type: string
                        description: 0x… sha256 hex of the exact notarized bytes
                      byteLength:
                        type: integer
                        description: byte length of the notarized content (UTF-8)
                      source:
                        type: string
                        description: 'where the content came from: the final url, or ''inline:content'''
                      sourceKind:
                        type: string
                        enum:
                        - url
                        - inline
                        description: url = fetched; inline = buyer-supplied
                      witnessedAt:
                        type: string
                        description: ISO-8601 time Mercury witnessed (== fetchedAt of the read)
                      statementVersion:
                        type: string
                        description: versioned notarization scheme id
                      verify:
                        type: object
                        description: how to verify OFFLINE without Mercury's SDK
                        properties:
                          howTo:
                            type: string
                          wellKnown:
                            type: string
                            description: where the witness key is publicly pinned
                    additionalProperties: false
                  fetchedAt:
                    type: string
                    description: ISO-8601 witness time (mirrors data.witnessedAt)
                  error:
                    type: string
                    description: present only when ok:false
                required:
                - ok
                - url
                additionalProperties: false
        '402':
          description: Payment Required — retry with an x402-signed payment (e.g. x402-fetch). Terms are in the challenge body (x402 v1).
      parameters:
      - name: url
        in: query
        required: false
        schema:
          type: string
          maxLength: 2048
          description: a page (http/https) to fetch + notarize its cleaned text. Provide EITHER url OR content, not both.
        description: a page (http/https) to fetch + notarize its cleaned text. Provide EITHER url OR content, not both.
      - name: content
        in: query
        required: false
        schema:
          type: string
          maxLength: 262144
          description: inline content (UTF-8, ≤256KB) to notarize directly — bytes you already hold. Provide EITHER url OR content, not both.
        description: inline content (UTF-8, ≤256KB) to notarize directly — bytes you already hold. Provide EITHER url OR content, not both.
      x-payment-info:
        protocols:
        - x402
        scheme: exact
        price: $0.008
        currency: USDC
        network: base
        networkCaip2: eip155:8453
        testnet: false
        asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
        payTo: '0xe10B9d44e72A29B9c19da02981FFCd875308e3C1'
        facilitator: https://api.cdp.coinbase.com/platform/v2/x402
        x402Version: 1
      x-x402:
        scheme: exact
        price: $0.008
        currency: USDC
        network: base
        networkCaip2: eip155:8453
        asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
        payTo: '0xe10B9d44e72A29B9c19da02981FFCd875308e3C1'
        facilitator: https://api.cdp.coinbase.com/platform/v2/x402
        testnet: false
        maxTimeoutSeconds: 60
x-payment-info:
  protocols:
  - x402
  network: base
  currency: USDC
  payTo: '0xe10B9d44e72A29B9c19da02981FFCd875308e3C1'
  facilitator: https://api.cdp.coinbase.com/platform/v2/x402
  testnet: false
  spec: mercury-storefront/1