OpenRouter

Unified LLM API gateway for multiple AI models. Chat completions are available through an MPP session endpoint on Tempo.

Documentation

Payment protocol

x402

basesolana

Payment protocol

mpp session

tempo

Method ledger

5 callable methods

OpenAPI source

POST/chat/completions

10000 USDC

Send chat completion requests to any supported LLM model through an MPP session.

Start an MPP session against https://openrouter.mpp.tempo.xyz/v1/chat/completions, then POST JSON body. The model field determines which provider and model to use.

{
  "body": {
    "model": "string (e.g. 'openai/gpt-4', 'anthropic/claude-3-opus', 'meta-llama/llama-3-70b')",
    "messages": [
      {
        "role": "string ('system'|'user'|'assistant')",
        "content": "string"
      }
    ],
    "temperature": "number (0-2, optional)",
    "max_tokens": "number (optional)",
    "top_p": "number (optional)",
    "stream": "boolean (optional)",
    "response_format": "object (optional)",
    "tools": "array (optional, function calling)"
  }
}

POST/completions

10000 USDC

Send text completion requests.

POST JSON body. Legacy text completion API. Use /chat/completions for chat-based models.

{
  "body": {
    "model": "string",
    "prompt": "string",
    "max_tokens": "number (optional)",
    "temperature": "number (optional)"
  }
}

POST/embeddings

10000 USDC

Generate embeddings for text input.

POST JSON body. Generate vector embeddings for text. Supports OpenAI-compatible embedding models.

{
  "body": {
    "model": "string (e.g. 'openai/text-embedding-3-small')",
    "input": "string | array of strings"
  }
}

POST/messages

10000 USDC

Send messages (Anthropic-compatible).

POST JSON body. Anthropic Messages API compatible endpoint. Works like /chat/completions but uses Anthropic message format.

{
  "body": {
    "model": "string",
    "max_tokens": "number",
    "messages": [
      {
        "role": "string",
        "content": "string"
      }
    ],
    "temperature": "number (optional)",
    "stream": "boolean (optional)"
  }
}

POST/responses

10000 USDC

Send a response request (OpenAI Responses API compatible).

POST JSON body. OpenAI Responses API compatible. Send input for model response generation.

{
  "body": {
    "model": "string",
    "input": "string | array",
    "instructions": "string (optional)",
    "temperature": "number (optional)",
    "max_output_tokens": "number (optional)"
  }
}