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Agent402 Grounded Chat Completions
x402
Agent402 Grounded Chat Completions is a paid API for AI agents from agent402.tools, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-13).
Answers chat prompts using an LLM grounded in live Exa web search results, returning cited responses with url_citation annotations for $0.03 USDC per call
Price / call$0.03
Success—
StatusUnknown
How this service works
OpenAI-compatible chat completions GROUNDED in a live web search on every call: the gateway runs an Exa search (up to 5 results) for the prompt, hands the results to the model, and returns the answer with url_citation annotations - $0.03 per call in USDC, no API key, no signup. Model is chosen server-side like the auto tier (omit "model" or send "auto"; explicit ranked models accepted); the response adds agent402_router {category, quality, served}.
Output
An OpenAI-compatible chat completion response where the assistant's message is grounded in up to 5 live Exa web search results. The response includes url_citation annotations linking claims to source URLs, and an agent402_router metadata block containing the routing category, quality band used, and the model that served the request.
Example use cases
Real-time news summarization with citations
“What's happening right now with the US-China trade negotiations? Search the web and give me a summary with sources I can check.”
Current product or pricing research
“What are the current prices and specs for the top 3 consumer GPU cards available right now? I need cited sources, not old training data.”
Fact-checking a recent claim
“Someone told me that a major earthquake hit Japan last week — can you search the web and tell me if that's true, with links to news sources?”
Technical details
Endpoint
POSThttps://agent402.tools/v1/grounded/chat/completionsWhen to prefer
Choose this endpoint when you need an LLM answer that reflects current, real-world information not in the model's training data — particularly for recent events, live pricing, breaking news, or factual claims requiring citations. It is preferable over a bare chat completion when freshness and source attribution matter, and over a raw search API when you want a synthesized, readable answer rather than raw results. The flat $0.03 USDC pay-per-call model with no signup makes it ideal for agents that need occasional grounded queries without committing to a subscription.
Side effects
- Payment not received or insufficient USDC balance — request rejected with 402 status
- Exa search returns no relevant results — model answers from parametric knowledge without web grounding
- max_tokens clamped to tier maximum if exceeded — response may be truncated
- Invalid messages format (non-array or missing role/content) — 400 error
- Explicit model requested that is unavailable or outside auto tier caps — may fall back to auto routing or error
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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