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agent402.tools Auto-Routed Chat Completions
x402
agent402.tools Auto-Routed Chat Completions is a paid API for AI agents from agent402.tools, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
OpenAI-compatible chat completions that automatically route prompts to the best-ranked model for the task (code, reasoning, long-context, or general) without requiring the caller to specify a model.
Price / call$0.01
Success—
StatusUnknown
How this service works
OpenAI-compatible chat completions with the model chosen server-side: omit model and the gateway routes the prompt to the top-ranked model for its task (code, reasoning, long-context, general) from a fixed eval-derived ranking, failing over automatically on provider errors. Flat price per call, 16k chars in, 1024 tokens out, streaming supported. Use it as a drop-in OpenAI base_url when you want good answers without picking a model.
Output
An OpenAI-compatible chat completion response containing the generated text from whichever model the gateway ranked highest for the detected task type (code, reasoning, long-context, or general), along with standard completion metadata.
Example use cases
Example prompt
“Send this message array to the auto-routing chat completions endpoint with quality set to 'best' and let the gateway pick the top model for reasoning tasks: [{"role":"user","content":"Explain the difference between mutex and semaphore in concurrent programming."}]”
Technical details
Endpoint
POSThttps://agent402.tools/v1/auto/chat/completionsWhen to prefer
Prefer this endpoint when you want OpenAI-compatible chat completions but don't want to hardcode a specific model — especially useful when task type varies (code vs. reasoning vs. general) and you want the gateway to route to the current best-ranked model automatically. Ideal for agents that need flat-rate, task-adaptive LLM access via x402 micropayment without managing model selection logic.
Side effects
- Invalid or malformed messages array — returns 400 with schema validation error
- max_tokens exceeds tier maximum — value is clamped silently or returns an error
- Payment not processed — 402 Payment Required if x402 payment header is missing or insufficient
- Model explicitly specified is not available in the auto-ranking tier — may fall back or error
- Rate limiting if too many concurrent requests from same wallet
- Upstream model provider outage causing delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Optional - omit (or send "auto") for eval-ranked server-side routing. An explicit model from the auto ranking is honored at the auto caps. |
| quality | string | Optional routing band when the gateway picks the model: "fast" (cheapest/snappiest), "balanced" (default), "best" (strongest under the flat price). Never changes the price. |
| messages | array | OpenAI chat messages: [{role, content}] - text and image_url content blocks supported |
| max_tokens | number | Output token cap (clamped to the tier maximum) |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "gen-…",
"model": "openai/gpt-4o-mini",
"usage": {
"total_tokens": 13,
"prompt_tokens": 12,
"completion_tokens": 1
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "OK"
},
"finish_reason": "stop"
}
],
"created": 1750000000,
"agent402_router": {
"served": "openai/gpt-4o-mini",
"quality": "balanced",
"category": "general"
}
}
}Tags
x402
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