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Zeno Finance Chat Completions API
x402
Zeno Finance Chat Completions API is a paid API for AI agents from api.zeno.finance, paid per call via x402, $0.016025/call, status unknown (last checked 2026-10-14).
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.
Price / call$0.016025
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Wallet-native agent reasoning loop
“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.”
Crypto-billed customer support bot
“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.”
On-chain agent content generation
“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.”
Technical details
Endpoint
POSThttps://api.zeno.finance/v1/chat/completions?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Configured model name to run, such as gpt-5.5 or gpt-5.4. |
| messages | array | OpenAI-compatible chat message list. |
| max_tokens | number | Maximum number of completion tokens to generate. |
Tags
x402
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