openapi: 3.2.0
info:
  title: MERCURY x402 storefront Cited Feed 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: cited-feed
paths:
  /buy/feed:
    get:
      summary: MERCURY Cited Feed
      description: 'RSS/Atom feed URL → a SIGNED, normalized item list [{title,link,published,summary}] unified across RSS 2.0/RDF + Atom 1.0: CDATA unwrapped, HTML stripped, entities decoded, dates → ISO-8601 (publishedRaw kept verbatim, never fabricated). Deterministic — same feed bytes ⇒ byte-identical items; no LLM. Core 4 fields only (not full-content/media/author). Receipt = EIP-191 over the canonical item list.'
      operationId: buy_cited_feed
      tags:
      - cited-feed
      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 (still delivered)
                  url:
                    type: string
                    description: final feed URL after redirects
                  status:
                    type: integer
                    description: upstream HTTP status
                  data:
                    type: object
                    description: the normalized feed (the product the buyer consumes)
                    properties:
                      feedTitle:
                        type: string
                        description: channel/feed <title>
                      kind:
                        type: string
                        enum:
                        - rss
                        - atom
                        description: which dialect was parsed
                      count:
                        type: integer
                        description: number of normalized items (capped at 100)
                      items:
                        type: array
                        description: uniform item records across both dialects
                        items:
                          type: object
                          properties:
                            title:
                              type: string
                              description: item/entry title (CDATA-unwrapped, decoded)
                            link:
                              type: string
                              description: canonical article URL (Atom alternate / RSS link / permalink id)
                            published:
                              type: string
                              description: ISO-8601 UTC when parseable, else empty (see publishedRaw)
                            publishedRaw:
                              type: string
                              description: the feed's original date string, verbatim (honest)
                            summary:
                              type: string
                              description: item description/summary, HTML stripped, ≤1000 chars
                  text:
                    type: string
                    description: canonical JSON string the signed receipt covers (data, with object keys sorted)
                  contentType:
                    type: string
                  fetchedAt:
                    type: string
                    description: ISO8601 fetch time (in the signed payload)
                  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: true
        schema:
          type: string
          maxLength: 2048
          description: the RSS/Atom feed to normalize (http/https)
        description: the RSS/Atom feed to normalize (http/https)
      x-payment-info:
        protocols:
        - x402
        scheme: exact
        price: $0.005
        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: $0.005
        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