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OpenAI-Compatible Chat Completions (Fast Tier, x402)
x402
OpenAI-Compatible Chat Completions (Fast Tier, x402) is a paid API for AI agents from d1zz2d7coymbr5.cloudfront.net, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Provides OpenAI-compatible chat completions with streaming support, accessible via x402 micropayment at $0.002 USDC per call.
Price / call$0.002
Success—
StatusUnknown
How this service works
OpenAI-compatible chat completion (fast tier). Streaming supported.
Output
Returns an OpenAI chat.completion object containing the assistant's generated message, finish reason, token usage statistics, and model metadata. When stream=true, returns server-sent events (SSE) with incremental delta chunks of the assistant message followed by a [DONE] signal.
Example use cases
Agent reasoning step via LLM
“Run a quick LLM call with system prompt 'You are a JSON extraction assistant' and user message 'Extract the names and dates from this paragraph: John met Alice on March 5 and Bob on April 12.' Return the result as a chat completion.”
Customer-facing chatbot backend
“I need to power a chatbot for my e-commerce site — send the conversation history including the system prompt 'You are a helpful shopping assistant for TechGear Store' and the latest user message 'Do you have wireless headphones under $50?' and stream back the reply.”
Automated content drafting pipeline
“Generate a short product description for a standing desk called 'ErgoDesk Pro' — use system prompt 'You are a professional copywriter' and user message 'Write a 3-sentence product description emphasizing ergonomics and home office use.'”
Technical details
Endpoint
POSThttps://d1zz2d7coymbr5.cloudfront.net/v1/chat/completionsWhen to prefer
Choose this endpoint when you need a pay-per-call OpenAI-compatible LLM with no subscription or API key management, especially useful for agents that need to make occasional or bursty LLM calls and want to pay micro-amounts via x402 USDC. Prefer this over managed OpenAI accounts when operating in autonomous agent pipelines that handle their own payments, or when building cost-accountable multi-agent systems where each LLM call should have a discrete, traceable cost.
Side effects
- Payment not included or insufficient USDC — 402 Payment Required response
- Invalid or missing messages array — 400 Bad Request
- Unsupported model identifier — 400 or 404 error
- Rate limit exceeded — 429 Too Many Requests
- Upstream LLM provider outage — 502 or 503 error
- Malformed request body — 400 with JSON parse error
- Stream connection dropped mid-response — incomplete SSE stream
Output
Schema · Response
{
"type": "object",
"description": "OpenAI chat.completion (or SSE stream when stream=true)"
}Tags
x402
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