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PennyRail OpenAI-Compatible Chat Mini
x402
PennyRail OpenAI-Compatible Chat Mini is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Provides an OpenAI-compatible chat completion API endpoint with micropayment settlement via x402, offering a mini/lightweight chat model interface
Price / call$0.02
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a chat completion response in OpenAI-compatible format, containing the assistant's generated message text and any associated metadata such as token usage and finish reason.
Example use cases
Pay-per-call AI chatbot backend
“I want to build a small chatbot that charges users per message without subscriptions — send this user's question to the mini chat model and return the answer: 'What are the best practices for writing clean Python code?'”
Lightweight content generation for scripts
“Use the mini chat model to generate a short product description for a wireless ergonomic keyboard aimed at remote workers — keep it under 60 words.”
Automated Q&A in an agent pipeline
“As part of my data pipeline, I need to classify this customer feedback using the chat model: 'The delivery was fast but the packaging was damaged.' Tell me if it's positive, negative, or mixed.”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/premium/ai.chat-mini--openai-compatible-chatWhen to prefer
Choose this endpoint when you need an OpenAI-compatible chat completion interface with per-call USDC micropayment billing via x402, avoiding subscription commitments. Ideal for agent pipelines that need lightweight, cost-controlled text generation without managing API key subscriptions. Prefer this over standard OpenAI API when your system already handles x402 payment flows and you want granular per-request cost control.
Side effects
- Payment failure if insufficient USDC balance — returns 402 Payment Required
- Malformed input object causes 400 Bad Request
- Model unavailability or upstream OpenAI outage returns 503 or 500
- Rate limiting may result in 429 Too Many Requests
- Missing required 'input' field returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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