{"slug":"x402-agentindex-world-v1-chat-completions-888aee","title":"OpenAI-compatible chat completions (non-streaming) for any OpenRouter model","host":"x402.agentindex.world","method":"POST","resource":"https://x402.agentindex.world/v1/chat/completions","category":"other","description":"OpenAI-compatible chat completions (non-streaming) for any OpenRouter model - GET /v1/models lists them free, with pricing (upstream cost x 1.10). Pay only for what you use: sign a ceiling based on your max_tokens, settle for real usage x 1.10 (min $0.001) once the call completes. Try GET /v1/chat/c","price_listed":0.001,"price_asked":0.001,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":882,"reported_calls_30d":2,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"max_tokens":5,"messages":[{"content":"Say OK.","role":"user"}],"model":"openai/gpt-4o-mini"},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"properties":{"max_tokens":{"description":"Max completion tokens, capped at 4096 - also bounds the x402 upto price ceiling.","type":"integer"},"messages":{"description":"OpenAI-format chat messages: [{role, content}, ...].","items":{"type":"object"},"minItems":1,"type":"array"},"model":{"description":"OpenRouter model id from GET /v1/models, e.g. \"openai/gpt-4o-mini\".","type":"string"}},"required":["model","messages"]},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"choices":{"items":{"type":"object"},"type":"array"},"id":{"type":"string"},"model":{"type":"string"},"usage":{"type":"object"},"x402_receipt":{"type":"object"}},"required":["choices","usage"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-09-28","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.001,"price_match":true,"latency_ms":882,"error":null}],"description_full":"OpenAI-compatible chat completions (non-streaming) for any OpenRouter model - GET /v1/models lists them free, with pricing (upstream cost x 1.10). Pay only for what you use: sign a ceiling based on your max_tokens, settle for real usage x 1.10 (min $0.001) once the call completes. Try GET /v1/chat/completions/sample.","last_updated":"2026-09-28T08:49:12.543Z","schemes":["exact"]}