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OpenAPI Specification

openapi: 3.2.0
info:
  title: Quartermaster Base API
  version: 1.6.0
  description: Small, reliable utility APIs for AI agents. Paid endpoints charge per call in USDC over the x402 protocol (HTTP 402 flow) - no accounts, no API keys. Free endpoints are open.
  contact:
    url: https://quartermaster.surewhynot.app
servers:
- url: https://quartermaster.surewhynot.app
tags:
- name: Base
paths:
  /v1/base/token-info:
    get:
      summary: ERC-20 token info on Base
      parameters:
      - name: address
        in: query
        required: true
        description: ERC-20 contract address
        schema:
          type: string
      responses:
        '200':
          description: Name, symbol, decimals, supply
          content:
            application/json:
              schema:
                type: object
        '402':
          description: Payment required
          content:
            application/json:
              schema:
                type: object
        '404':
          description: Not a token
          content:
            application/json:
              schema:
                type: object
      x-payment:
        protocol: x402
        price: $0.001
        currency: USDC
        note: Unpaid requests receive 402 Payment Required with machine-readable payment requirements.
      tags:
      - Base
      operationId: getV1BaseTokenInfo
      x-operation-id-source: derived
  /v1/base/allowance:
    get:
      summary: ERC-20 allowance on Base
      parameters:
      - name: owner
        in: query
        required: true
        description: Token owner
        schema:
          type: string
      - name: spender
        in: query
        required: true
        description: Approved spender
        schema:
          type: string
      - name: token
        in: query
        required: false
        description: '''usdc'' or contract'
        schema:
          type: string
          default: usdc
      responses:
        '200':
          description: Allowance
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid input
          content:
            application/json:
              schema:
                type: object
        '402':
          description: Payment required
          content:
            application/json:
              schema:
                type: object
      x-payment:
        protocol: x402
        price: $0.001
        currency: USDC
        note: Unpaid requests receive 402 Payment Required with machine-readable payment requirements.
      tags:
      - Base
      operationId: getV1BaseAllowance
      x-operation-id-source: derived
  /v1/base/contract:
    get:
      summary: Contract vs EOA on Base
      parameters:
      - name: address
        in: query
        required: true
        description: Base address
        schema:
          type: string
      responses:
        '200':
          description: Address type
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid address
          content:
            application/json:
              schema:
                type: object
        '402':
          description: Payment required
          content:
            application/json:
              schema:
                type: object
      x-payment:
        protocol: x402
        price: $0.001
        currency: USDC
        note: Unpaid requests receive 402 Payment Required with machine-readable payment requirements.
      tags:
      - Base
      operationId: getV1BaseContract
      x-operation-id-source: derived
  /v1/base/usdc-transfers:
    get:
      summary: Recent USDC transfers on Base
      parameters:
      - name: address
        in: query
        required: true
        description: Address to list transfers for
        schema:
          type: string
      - name: limit
        in: query
        required: false
        description: Max results (1-50)
        schema:
          type: integer
          default: 20
      responses:
        '200':
          description: Transfers
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid address
          content:
            application/json:
              schema:
                type: object
        '402':
          description: Payment required
          content:
            application/json:
              schema:
                type: object
      x-payment:
        protocol: x402
        price: $0.002
        currency: USDC
        note: Unpaid requests receive 402 Payment Required with machine-readable payment requirements.
      tags:
      - Base
      operationId: getV1BaseUsdcTransfers
      x-operation-id-source: derived
externalDocs:
  description: 'Buyer quickstart: how to pay with x402'
  url: https://quartermaster.surewhynot.app/buyers