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OpenAI-Compatible Flat-Rate Chat Completions
x402
OpenAI-Compatible Flat-Rate Chat Completions is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).
Delivers LLM chat completions using the OpenAI API request/response format at a fixed per-call price with no token metering, no API key, and automatic model failover.
Price / call$0.005
Success—
StatusUnknown
How this service works
Chat completions with the exact request and response shape of the OpenAI API: point your existing client at this URL and it works, no code change. One flat price per call whatever the size of the prompt or the answer — no token metering, no API key, no account, no rate limit. Automatic failover across several large models, so a model being down is not your problem. You are only charged if the completion is delivered.
Output
Returns an OpenAI-format chat completion object containing the assistant's message, finish reason, and model metadata — identical in shape to an OpenAI /v1/chat/completions response, so existing OpenAI SDK clients can consume it without modification.
Example use cases
Automated customer support draft generation
“For this incoming support ticket — 'My order hasn't arrived after two weeks, what should I do?' — generate a polite, helpful draft reply an agent can send, keeping it under 150 words. Use the flat-rate chat endpoint so we pay the same regardless of how long the response is.”
Coding assistant inside a dev workflow
“I'm building a script and I'm stuck — can you ask the LLM to explain what's wrong with this Python function and suggest a fix? Here's the code: `def add(a, b): return a - b`. Cap the response at 200 tokens.”
Multi-turn conversation with budget predictability
“I need to run a 3-turn conversation with an AI tutor explaining the basics of photosynthesis for a middle schooler — use the flat-rate LLM so I know exactly what each call costs, and keep temperature at 0.5 for consistent answers.”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need OpenAI-compatible chat completions with perfectly predictable per-call pricing — ideal for agents that make many short or variable-length calls and want to avoid token-metering surprises. Also ideal when you have an existing OpenAI client and want zero code changes, or when uptime matters and you want automatic multi-model failover without managing it yourself. Less suitable for very high-volume batch workloads where per-token pricing would be cheaper than per-call.
Side effects
- Model backend unavailable despite failover (returns error after all models exhausted)
- Payment not confirmed — completion not delivered, charge not incurred
- Malformed messages JSON in query string (parse error returned)
- max_tokens exceeds 4000 cap (clamped or rejected)
- Network timeout on the Cloudflare Worker side
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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