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Chat Completion (basic)
x402
Chat Completion (basic) is a paid API for AI agents from api.eucompliance.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Send a prompt or messages array and get an LLM-generated text response as JSON, with no account or API key required, at a fixed per-call price with a signed auditable receipt.
Price / call$0.005
Success—
StatusUnknown
How this service works
LLM completion per call, no account and no API key: POST a prompt (or a messages array) and get the model answer as JSON. Hard caps disclosed in every response (6,000 UTF-8 bytes in, 750 tokens out on this tier). Fixed price per call, signed receipt included so the answer stays auditable. Larger tier at /x402/chat-plus.
Output
A JSON object containing the model's text answer to the submitted prompt or messages array, along with usage metadata (character/token counts), hard cap disclosures (8,000 chars in, 1,000 tokens out), and a signed cryptographic receipt confirming the response for auditability. No streaming; response is returned synchronously.
Example use cases
On-demand agent reasoning step
“I need a quick LLM call to classify this customer complaint as billing, technical, or general — no API key setup, just pay per use: 'My invoice shows a charge I don't recognize from last month.'”
Auditable AI answer for compliance log
“Ask the LLM whether this contract clause complies with GDPR and give me the signed receipt so I can attach it to the audit trail: 'The controller may retain personal data for up to 10 years without further consent.'”
Lightweight chatbot response in automation
“I'm building a no-account automation — send this user message to a chat model and get the reply back as JSON: 'What are the main differences between a sole trader and a limited company in the UK?'”
Technical details
Endpoint
POSThttps://api.eucompliance.tools/x402/chatWhen to prefer
Choose this endpoint when you need a one-off or low-volume LLM completion with no account registration, no API key management, and a fixed auditable cost per call. It is ideal for agents that need to embed LLM calls in automated pipelines without committing to a subscription, or when a signed receipt is required for compliance and auditability. If you need higher output limits (beyond 1,000 tokens out or 8,000 chars in), use the sibling /x402/chat-plus endpoint instead.
Side effects
- Input exceeds 8,000 character hard cap — request rejected with cap disclosure
- Output truncated at 1,000 tokens if model response would exceed limit
- Malformed messages array structure returns a 400-level error
- Payment not confirmed or x402 handshake fails — call not executed
- Model unavailable or upstream timeout returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | the question or task |
| system | string | optional system prompt |
| messages | array | optional OpenAI-style messages instead of prompt |
Tags
x402
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