MERCURY Cited Redirect API

openapi: 3.2.0
info:
  title: MERCURY x402 storefront Cited Redirect 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-redirect
paths:
  /buy/redirect:
    get:
      summary: MERCURY Cited Redirect
      description: 'URL → a SIGNED redirect/canonical resolution: the full hop chain [{url,status}] from the link you have to where it ACTUALLY lands, the final resolved URL + status, the page''s , hop count, cross-origin flag and distinct origins traversed (affiliate-cloak / link-safety signal). Deterministic — same redirects ⇒ byte-identical resolution; no LLM. Follows HTTP 3xx only (no JS/meta-refresh execution — meta-refresh target surfaced un-followed). Receipt = EIP-191 over the resolved chain.'
      operationId: buy_cited_redirect
      tags:
      - cited-redirect
      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 resolved URL after following all HTTP 3xx redirects
                  status:
                    type: integer
                    description: upstream HTTP status of the FINAL resolved URL
                  data:
                    type: object
                    description: the structured redirect/canonical resolution (the product the buyer consumes)
                    properties:
                      requestedUrl:
                        type: string
                        description: the URL the buyer asked us to resolve
                      finalUrl:
                        type: string
                        description: the destination after all redirects (where the link ACTUALLY goes)
                      finalStatus:
                        type: integer
                        description: upstream HTTP status of the final URL
                      finalOrigin:
                        type: string
                        description: scheme://host of the final URL
                      canonical:
                        type:
                        - string
                        - 'null'
                        description: the final page's <link rel=canonical> href, or null
                      metaRefresh:
                        type:
                        - string
                        - 'null'
                        description: an UN-followed <meta refresh> target on the final page (JS/meta hops are not executed), or null
                      hopCount:
                        type: integer
                        description: number of redirect hops followed (0 = no redirect, direct hit)
                      redirected:
                        type: boolean
                        description: true if the requested URL was redirected at least once
                      crossOrigin:
                        type: boolean
                        description: true if the final origin differs from the requested origin (cloak/affiliate signal)
                      distinctOrigins:
                        type: array
                        description: ordered, de-duplicated origins traversed from requested → final (how many hosts a single click routes through)
                        items:
                          type: string
                      hops:
                        type: array
                        description: 'the full hop chain: each step''s URL, its origin, and its HTTP status (null on an intermediate hop whose exact 3xx code the engine did not capture)'
                        items:
                          type: object
                          properties:
                            url:
                              type: string
                            origin:
                              type: string
                              description: scheme://host of this hop
                            status:
                              type:
                              - integer
                              - 'null'
                              description: HTTP status (final hop = real status; intermediate = null when uncaptured)
                            redirect:
                              type: boolean
                              description: true for an intermediate redirect step, false for the final destination
                  text:
                    type: string
                    description: 'canonical newline string the signed receipt covers (one row per hop: `<status>\t<url>`, requested→final order; trailing `canonical\t<href>`)'
                  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 link/URL to resolve (http/https) — e.g. a shortlink or affiliate URL
        description: the link/URL to resolve (http/https) — e.g. a shortlink or affiliate URL
      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