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PennyRail GPT-4o Mini Inference
x402
PennyRail GPT-4o Mini Inference is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Runs GPT-4o Mini LLM inference via a paid micropayment-gated API endpoint costing $0.01 USDC per call
Price / call$0.01
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
A JSON object containing the LLM's generated response to the provided input, with schema varying based on the underlying model's output format; the response is open-ended (additionalProperties: true) and may include generated text, token counts, or other completion metadata.
Example use cases
Cheap bulk text generation for agents
“I need to run a bunch of short text completions using GPT-4o Mini through a pay-per-call API — can you use the PennyRail inference endpoint? Each call is just one cent in USDC so it should be affordable at scale.”
Agentic task with LLM reasoning step
“My automation workflow needs a quick reasoning step — can you call the PennyRail GPT-4o Mini inference API with this input object and return whatever the model says? It charges $0.01 USDC per call via x402.”
Prototype LLM feature with micropayment billing
“I'm prototyping a chatbot and want to test GPT-4o Mini responses without setting up my own OpenAI account — can you hit the PennyRail inference endpoint with my prompt and show me the result?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/standard/ai.llm-mini--gpt-4o-mini-inferenceWhen to prefer
Choose this endpoint when you need cheap, pay-per-call GPT-4o Mini inference without managing your own OpenAI API key, especially in agentic or automated workflows that support the x402 micropayment protocol and USDC billing. Ideal for low-volume, cost-sensitive inference tasks where $0.01 per call pricing is attractive and no monthly subscription commitment is desired.
Side effects
- Payment failure or insufficient USDC balance causes 402 Payment Required
- Malformed input object missing required 'input' field causes 400 Bad Request
- Upstream OpenAI API unavailability causes 502 or 503 errors
- Rate limiting by the PennyRail platform may cause 429 Too Many Requests
- Malformed x402 payment header causes authentication/payment rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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