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CheapestInference Chat Completions
x402
CheapestInference Chat Completions is a paid API for AI agents from api.cheapestinference.com, paid per call via x402, $20/call, status unknown (last checked 2026-09-13).
Run chat completions against 200+ open-source AI models via an OpenAI-compatible API at a flat per-call rate
Price / call$20
Success—
StatusUnknown
How this service works
Access 200+ open-source AI models through a single OpenAI-compatible API. Flat-rate pricing with no per-token charges. Pay with card or USDC on Base.
Output
Returns an OpenAI-compatible JSON object with a 'choices' array containing the generated message content, finish reason, and model metadata for the selected open-source model.
Example use cases
Example prompt
“Use CheapestInference to run this conversation through mistralai/Mistral-7B-Instruct: system prompt 'You are a helpful assistant', user message 'Summarize the key differences between REST and GraphQL in three bullet points' — flat rate, no token charges.”
Technical details
Endpoint
POSThttps://api.cheapestinference.com/v1/chat/completionsWhen to prefer
Choose this endpoint when you need OpenAI-compatible chat completions from open-source models (Llama, Mistral, etc.) at a predictable flat per-call cost rather than variable per-token pricing, especially when paying with USDC on Base via x402 protocol.
Side effects
- Payment not received or invalid USDC transaction — 402 Payment Required
- Invalid or unsupported model identifier — 400 Bad Request
- Malformed messages array or missing required fields — 422 Unprocessable Entity
- Model temporarily unavailable — 503 Service Unavailable
- Rate limit exceeded — 429 Too Many Requests
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| choices | array |
Tags
x402
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