openapi: 3.2.0
info:
  title: Orthogonal API Marketplace Baseten Model APIs API
  version: 1.0.0
  description: Discoverable APIs payable over MPP (Machine Payments Protocol / Tempo), x402, and np (Circle Gateway Nanopayments, x402 v2).
servers:
- url: https://mpp.orthogonal.com
  description: MPP (Tempo) rail
- url: https://x402.orthogonal.com
  description: x402 rail
- url: https://np.orthogonal.com
  description: np (Circle Gateway, x402 v2) rail
tags:
- name: Baseten Model APIs
paths:
  /baseten/v1/chat/completions:
    post:
      operationId: baseten_POST__v1_chat_completions
      summary: Send a conversation to a model and get a completion back. Works exactly like the OpenAI chat completions endpoint. Pass messages and a model slug, get a response with the assistant's reply. Supports streaming for real-time token delivery, tool calling for function execution, structured outputs via response_format, and controllable reasoning depth on supported models.
      tags:
      - Baseten Model APIs
      responses:
        '200':
          description: Successful response
        '402':
          description: Payment Required (x402 / MPP / np)
      x-payment-info:
        price: dynamic
        offers:
        - method: mpp
          intent: charge
          rail: tempo
          currency: USDC.e
          url: https://mpp.orthogonal.com/baseten/v1/chat/completions
        - method: x402
          intent: charge
          rail: base
          currency: USDC
          url: https://x402.orthogonal.com/baseten/v1/chat/completions
        - method: np
          intent: charge
          rail: base
          currency: USDC
          settlement: circle-gateway
          version: x402-v2
          url: https://np.orthogonal.com/baseten/v1/chat/completions
  /baseten/v1/models:
    get:
      operationId: baseten_GET__v1_models
      summary: Returns the current list of available models with metadata including pricing, context window sizes, and supported features. Use this to discover valid model slugs for the chat completions endpoint.
      tags:
      - Baseten Model APIs
      responses:
        '200':
          description: Successful response
x-service-info:
  name: Orthogonal
  docs:
    llms: https://api.orthogonal.com/llms.txt
  protocols:
  - mpp
  - x402
  - np