{"slug":"pay-omnidev-tech-x402-chat-small-09aa4d","title":"Pay-per-call chat completion on the small tier","host":"pay.omnidev.tech","method":"POST","resource":"https://pay.omnidev.tech/x402/chat-small","category":"market","description":"Pay-per-call chat completion on the small tier. One request returns one assistant message, limited to 8000 input and 1024 output tokens, at 0.008 USDC per call on Base. Payment settles after the response is produced. A client nonce header makes a retry free of a second charge.","price_listed":0.008,"price_asked":0.008,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":569,"reported_calls_30d":3,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"max_tokens":64,"messages":[{"content":"Summarize the x402 payment flow in one sentence.","role":"user"}]},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"max_tokens":{"description":"Upper bound on output tokens.","maximum":1024,"minimum":1,"type":"integer"},"messages":{"description":"Conversation, oldest first.","items":{"additionalProperties":false,"properties":{"content":{"description":"Message text.","type":"string"},"role":{"enum":["system","developer","user","assistant"],"type":"string"}},"required":["role","content"],"type":"object"},"maxItems":64,"minItems":1,"type":"array"},"model":{"description":"auto selects the tier model.","enum":["auto","llama-3.1-8b","kimi-k3"],"type":"string"},"prompt":{"description":"Shorthand for one user message; used when messages is absent.","type":"string"}},"type":"object"},"bodyType":{"enum":["json"],"type":"string"},"headers":{"additionalProperties":{"type":"string"},"properties":{"X-Omni-Client-Nonce":{"description":"Present on every request that carries a payment credential: a random base64url value, 22-128 characters, new for each payment. A paid request without it is answered 400 client_nonce_required and is not charged.","pattern":"^[A-Za-z0-9_-]{22,128}$","type":"string"}},"type":"object"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"facilitator_tx":{"type":"string"},"ok":{"type":"boolean"},"result":{"properties":{"choices":{"type":"array"},"id":{"type":"string"},"model":{"type":"string"},"object":{"type":"string"},"usage":{"type":"object"}},"required":["choices"],"type":"object"},"settled":{"type":"boolean"}},"required":["ok","result"],"type":"object"},"type":{"const":"json","type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-18","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.008,"price_match":true,"latency_ms":569,"error":null}],"description_full":"Pay-per-call chat completion on the small tier. One request returns one assistant message, limited to 8000 input and 1024 output tokens, at 0.008 USDC per call on Base. Payment settles after the response is produced. A client nonce header makes a retry free of a second charge.","last_updated":"2026-10-17T01:02:32.499Z","schemes":["exact"]}