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OpenAI-Compatible Chat Completions (x402, USDC, No Account Required)
x402
OpenAI-Compatible Chat Completions (x402, USDC, No Account Required) is a paid API for AI agents from agent-production-1daa.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Runs OpenAI-compatible LLM chat completions (summarize, classify, extract, translate, generate, chat) paid per request in USDC on Base — no API key or account needed.
Price / call$0.001
Success—
StatusUnknown
How this service works
LLM inference API for AI agents: OpenAI-compatible chat completions paid per request in USDC on Base. No account or API key. Summarize, classify, extract, translate, generate and chat with gpt-5.4-nano, gpt-5.4-mini, gpt-5.4, gpt-5.5, gpt-4o-mini and more. Misses billed at cost + 4% on actual token usage (upto scheme); deterministic repeats (temperature 0) are cache hits billed at 55% of provider price — loops get cheaper automatically. From $0.001/call, standard OpenAI POST format.
Output
An OpenAI-format chat completion response object containing the model's generated text, finish reason, token usage counts, and model identifier. For deterministic (temperature=0) repeated calls, responses are served from cache at 55% of provider price.
Example use cases
Example prompt
“Using gpt-4o-mini, summarize the following article in 3 bullet points and keep the output under 300 tokens: 'Researchers at MIT have developed a new battery technology that can charge in under 5 minutes and last 10 years...'”
Technical details
Endpoint
POSThttps://agent-production-1daa.up.railway.app/v1/chat/completionsWhen to prefer
Choose this endpoint when an AI agent needs LLM inference without setting up an OpenAI account or API key, and can pay per-call in USDC on Base via the x402 protocol. Ideal for crypto-native agent pipelines, cost-controlled loops (temperature=0 caching cuts costs automatically), or serverless agent workflows that need on-demand text generation, summarization, classification, or extraction without credential management.
Side effects
- Insufficient USDC payment on Base results in 402 Payment Required
- Unsupported model name returns validation error
- max_tokens exceeds authorized payment ceiling — request rejected
- Malformed messages array returns 400 Bad Request
- Network or upstream OpenAI outage causes 502/503 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Upstream model to run |
| messages | array | OpenAI chat messages array |
| max_tokens | number | Output cap; the authorized payment ceiling scales with it |
Tags
x402
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Zero review prompt (fires after every successful call)
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