{"uid":"cap_DyrRVEuA8MA2_KAXyFExF","slug":"zeno-finance-chat-completions-api-5c8770be","name":"Zeno Finance Chat Completions API","description":"General-purpose Chat Completions API from api.zeno.finance for agents and applications that need OpenAI-compatible conversational inference with wallet-paid access. Pricing starts at $0.001 and is usage-settled up to a $6 per-request cap. Buyers receive a standard chat.completion response plus tokens spent and request cost.","url":"https://api.zeno.finance/v1/chat/completions?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Configured model name to run, such as gpt-5.5 or gpt-5.4."},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","user","assistant","developer"],"type":"string"},"content":{"type":"string"}},"additionalProperties":false},"minItems":1,"description":"OpenAI-compatible chat message list."},"max_tokens":{"type":"number","minimum":1,"description":"Maximum number of completion tokens to generate."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.016025","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.016025/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.016025","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.016025","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_P8ZASqZly4nYZBUX4TQOl","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.016025","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"OpenAI-compatible chat completions endpoint with wallet-paid (x402) access, supporting models like GPT-5.5 and settling costs per token used up to $6 per request.","exampleAgentPrompt":"Send a chat completion request using the GPT-5.5 model with the system message 'You are a concise assistant' and my user message 'Summarize the history of the Roman Empire in 3 bullet points', with a max of 300 tokens — and pay for it from my wallet.","exampleUseCases":[{"title":"Wallet-native agent reasoning loop","prompt":"My autonomous agent needs to call GPT-5.5 to decide its next action based on this context: 'You are a task planner. The user wants to book a flight.' — send that as the system message and 'What steps should I take?' as the user message, limit to 200 tokens, and pay from my USDC wallet."},{"title":"Crypto-billed customer support bot","prompt":"I'm building a support bot that pays per response — use the GPT-5.4 model to reply to this customer message: 'My order hasn't arrived after 2 weeks, what should I do?' with a helpful support tone, up to 500 tokens, billed to my wallet."},{"title":"On-chain agent content generation","prompt":"Have GPT-5.5 write a short product description for a pair of noise-cancelling headphones — system prompt: 'You are a marketing copywriter', user message: 'Write a 3-sentence product blurb for premium noise-cancelling headphones', max 150 tokens, charged to my crypto wallet via x402."}],"resultDescription":"Returns a standard OpenAI-format chat.completion object containing the assistant's reply, plus metadata fields for tokens spent and the actual cost of the request in USDC.","failureModes":["Insufficient wallet balance for the request cost — payment rejected before inference runs","Model name not recognized or unavailable — returns model not found error","messages array empty or malformed — validation error before processing","max_tokens exceeds model context window — truncation or error response","Request cost exceeds $6 per-request cap — request rejected"],"whenToPreferThis":"Choose this endpoint when your agent or application needs OpenAI-compatible chat completions but must pay via crypto wallet (USDC/x402) rather than a traditional API key subscription. Ideal for autonomous agents that hold their own wallets, on-chain applications, or developers who want usage-settled micro-payment billing instead of prepaid credit. Prefer over standard OpenAI direct access when wallet-native payment or per-request cost transparency is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:36:14.479Z","isFirstParty":false,"canonicalSlug":"zeno-finance-chat-completions-api-5c8770be"}