{"slug":"agent402-tools-v1-chat-completions-4ccfd6","title":"OpenAI-compatible chat completions paid per call in USDC","host":"agent402.tools","method":"POST","resource":"https://agent402.tools/v1/chat/completions","category":"other","description":"OpenAI-compatible chat completions paid per call in USDC: point any OpenAI SDK at this base URL and send a normal chat request, with the model chosen from a curated list and streaming supported. Use it when an agent needs a model answer without an API key or an account, one call at a time, with a re","price_listed":0.02,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":85,"reported_payers_30d":2,"networks":["algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=","eip155:10","eip155:1329","eip155:137","eip155:143","eip155:42161","eip155:42220","eip155:43114","eip155:4663","eip155:8453","solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","stellar:pubnet"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"max_tokens":5,"messages":[{"content":"Reply with exactly: 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":{"cache_control":{"description":"Optional - prompt caching preference. Default ON ({type:\"ephemeral\"}, 5-minute TTL): repeated prefixes across your turns are served from the provider cache (same price to you). Send false to disable. ttl:\"1h\" is not offered."},"max_completion_tokens":{"description":"Optional - alias of max_tokens (newer OpenAI SDKs send this).","type":"integer"},"max_tokens":{"description":"Output token cap (clamped to the tier maximum)","type":"number"},"messages":{"description":"OpenAI chat messages: [{role, content}] - text and image_url content blocks supported","type":"array"},"model":{"description":"Model id - OpenRouter form (openai/gpt-4o-mini) or bare OpenAI form (gpt-4o-mini). GET /v1/models lists the allowlist per tier. Optional: omit it and the tier serves its documented default (x402.defaultModel on /v1/models), named back in agent402_default_model; the price does not change","type":"string"},"reasoning":{"description":"Optional - {effort: \"none\"|\"minimal\"|\"low\"|\"medium\"|\"high\"|\"xhigh\"|\"max\", max_tokens?, exclude?, enabled?}. Reasoning tokens count against max_tokens. Omitted: low effort on the budget tiers, the model default on premium. reasoning_effort (string) is accepted as an alias.","type":"object"},"tools":{"description":"Optional - OpenAI function tools {type:\"function\", function:{...}}, or a tool namespace {type:\"namespace\", name, tools:[...]} (flattened into its functions). The pro and premium routes also accept the bounded server tools openrouter:web_search, openrouter:web_fetch and openrouter:datetime with server-owned limits (GET /v1/models lists them); stop_server_tools_when and max_tool_calls are refused. A request with a server tool is never served from the prompt cache.","type":"array"},"zdr":{"description":"Optional - true routes only to zero-data-retention providers (OpenRouter provider.zdr); the only provider preference a caller may set.","type":"boolean"}},"required":["messages"]},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"choices":{"items":{"type":"object"},"type":"array"},"created":{"type":"integer"},"id":{"type":"string"},"model":{"type":"string"},"object":{"type":"string"},"usage":{"properties":{"completion_tokens":{"type":"integer"},"prompt_tokens":{"type":"integer"},"total_tokens":{"type":"integer"}},"type":"object"}},"required":["id","object","created","model","choices","usage"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"OpenAI-compatible chat completions paid per call in USDC: point any OpenAI SDK at this base URL and send a normal chat request, with the model chosen from a curated list and streaming supported. Use it when an agent needs a model answer without an API key or an account, one call at a time, with a receipt for each.","last_updated":"2026-09-24T16:01:58.103Z","schemes":["exact","upto"]}