> ## Documentation Index
> Fetch the complete documentation index at: https://docs.simpuru.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# One purchase with its on-chain timeline

> Events are derived from chain by the seller agent (lock, result, refund request, dispute, final spend).



## OpenAPI

````yaml https://api.simpuru.xyz/openapi.json get /purchases/{id}
openapi: 3.1.0
info:
  title: Simpuru API
  version: 0.1.0
  summary: Buyer protection for AI agents paying with x402 on Cardano (preprod).
  description: >-
    Sellers list design prompts; each listing commits to the SHA-256 of its
    content.

    Buyers (people or agents) pay over **x402** on Cardano preprod, either
    **instant** (pay the seller)

    or **protected** (lock into our `vested_pay` escrow, released only if
    delivery checks out).


    Consumers: the web app (`apps/web`), the buyer agent and protection watcher
    (`apps/agent`), the MCP

    server (`apps/mcp`, hosted at `/mcp`), and the arbiter service
    (`apps/arbiter`, internal).


    Every on-chain claim can be checked on
    `https://preprod.cardanoscan.io/transaction/<hash>`.
  license:
    name: MIT
    identifier: MIT
servers:
  - url: https://api.simpuru.xyz
    description: Production (Cardano preprod)
  - url: http://localhost:4021
    description: Local `bun run dev` in apps/api
security: []
tags:
  - name: Account
    description: >-
      Sign in with a Cardano wallet (CIP-30 `signData`), then use the session as
      `Authorization: Bearer <token>`. Every account has a Simpuru wallet: a
      preprod wallet the platform holds for the owner, funded with tADA, that
      web purchases and the owner's agents spend from.
  - name: Catalogue
    description: Free listing data.
  - name: Paid content
    description: 'The x402 paywall: instant or escrow-protected.'
  - name: Purchases
    description: Purchase timelines, derived from chain by the seller agent.
  - name: MCP
    description: Model Context Protocol endpoint for agents (Claude Code, Cursor, ...).
  - name: Arbiter (internal)
    description: Dispute settlement service, `apps/arbiter`, port 4023. Not public.
  - name: System
    description: Health.
paths:
  /purchases/{id}:
    get:
      tags:
        - Purchases
      summary: One purchase with its on-chain timeline
      description: >-
        Events are derived from chain by the seller agent (lock, result, refund
        request, dispute, final spend).
      operationId: getPurchase
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
          description: Payment tx (instant) or lock tx (protected)
      responses:
        '200':
          description: Purchase
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Purchase'
        '404':
          description: Unknown purchase
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Purchase:
      type: object
      properties:
        id:
          type: string
          pattern: ^[0-9a-f]{64}$
          description: Payment tx (instant) or lock tx (protected).
        listingId:
          type: string
        mode:
          $ref: '#/components/schemas/DeliveryMode'
        buyerAddress:
          type: string
        txHash:
          type: string
          pattern: ^[0-9a-f]{64}$
          description: Cardano transaction hash.
        status:
          type: string
          description: >-
            Escrow state (FundsLocked, ResultSubmitted, RefundRequested,
            Disputed, WithdrawAuthorized, RefundAuthorized) or a final state
            (settled, withdrawn, refunded, closed). `withdrawing` while the
            seller agent collects.
        escrow:
          type: object
          properties:
            address:
              type: string
            inputHash:
              type: string
              pattern: ^[0-9a-f]{64}$
              description: Lowercase hex SHA-256.
            resultHash:
              type: string
              pattern: ^[0-9a-f]{64}$
              description: Lowercase hex SHA-256.
            identifierFromPurchaser:
              type: string
              pattern: ^[0-9a-f]{64}$
              description: 'Team convention: the lock tx hash.'
            deadlines:
              $ref: '#/components/schemas/EscrowDeadlines'
        events:
          type: array
          items:
            $ref: '#/components/schemas/PurchaseEvent'
        verification:
          $ref: '#/components/schemas/Verification'
      required:
        - id
        - listingId
        - mode
        - buyerAddress
        - txHash
        - status
        - events
    Error:
      type: object
      properties:
        error:
          type: string
      required:
        - error
    DeliveryMode:
      type: string
      enum:
        - instant
        - protected
    EscrowDeadlines:
      type: object
      description: Unix ms strings.
      properties:
        payBy:
          type: string
        submitResult:
          type: string
        unlock:
          type: string
        externalDisputeUnlock:
          type: string
    PurchaseEvent:
      type: object
      properties:
        status:
          type: string
        txHash:
          type: string
          pattern: ^[0-9a-f]{64}$
          description: Cardano transaction hash.
        at:
          type: string
          description: Unix ms.
      required:
        - status
        - txHash
        - at
    Verification:
      type: string
      enum:
        - ok
        - mismatch
        - no_result_yet

````

This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.