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PennyRail GPT-4o Mini Chat
x402
PennyRail GPT-4o Mini Chat 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).
Sends a chat message to GPT-4o Mini via a paid micropayment API proxy and returns the model's response
Price / call$0.02
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object containing the GPT-4o Mini model's text response to the provided input, structured as an open-ended object. The exact fields depend on the model output but typically include the generated message or completion.
Example use cases
Quick factual Q&A via mini model
“Ask GPT-4o Mini: 'Explain the difference between RAM and ROM in simple terms' and return the answer to me.”
Agent sub-task text generation
“I need a short product description for my new wireless headphones — use the GPT-4o Mini chat endpoint to draft one for me.”
Automated customer support reply draft
“Draft a polite email response to this customer complaint using GPT-4o Mini: 'My order arrived damaged and I want a refund.'”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/premium/ai.chat-mini--gpt-4o-mini-chatWhen to prefer
Choose this endpoint when you need lightweight, cost-efficient chat completions via GPT-4o Mini at $0.02 per call without managing your own OpenAI API keys, and when your agent or application supports x402 micropayment flows. It is ideal for agentic pipelines that need pay-per-use text generation without subscription overhead.
Side effects
- Payment failure: insufficient USDC balance causes 402 rejection before the model is called
- Invalid input schema: missing or malformed 'input' object returns a 400 or validation error
- Model timeout: GPT-4o Mini upstream latency occasionally causes gateway timeouts
- Opaque response schema: additionalProperties:true means response shape may vary and agents must handle unexpected fields
- Rate limiting: high-frequency callers may be throttled by the proxy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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