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GPT-5 Nano via x402 Gateway
x402
GPT-5 Nano via x402 Gateway is a paid API for AI agents from x402-gateway-production.up.railway.app, paid per call via x402, $0.002000/call, status unknown (last checked 2026-09-14).
Calls OpenAI's GPT-5 Nano model — the cheapest GPT-5 tier — via a pay-per-call x402 gateway for high-volume, cost-sensitive agent tasks
Price / call$0.002000
Success—
StatusUnknown
How this service works
OpenAI's cheapest GPT-5 tier — ultra-affordable for high-volume agent tasks
Output
A generated text response from GPT-5 Nano — typically a completion, answer, summary, or classification based on the input prompt, returned as a JSON payload with the model output.
Example use cases
Example prompt
“Use the cheapest GPT-5 model to summarize the following product review in two sentences: 'The battery life is amazing and the screen is gorgeous, but the camera quality disappointed me and setup took forever.'”
Technical details
Endpoint
POSThttps://x402-gateway-production.up.railway.app/api/llm/gpt-5-nanoWhen to prefer
Choose this endpoint when cost-per-call is the primary concern and you need GPT-5 quality at the lowest available tier — ideal for high-volume automation, bulk classification, summarization pipelines, or any agent loop making many LLM calls. Prefer over GPT-4o or Claude endpoints when the task is straightforward and does not require advanced reasoning or multimodal input.
Side effects
- Payment not included or insufficient USDC — 402 Payment Required
- Prompt too long for model context window — 400 Bad Request
- Model temporarily unavailable on gateway — 503 Service Unavailable
- Malformed request body — 400 with validation error
- Rate limit exceeded on gateway — 429 Too Many Requests
Input
{
"messages": [
{
"role": "user",
"content": "Summarize the following product review in two sentences: 'The battery life is amazing and the screen is gorgeous, but the camera quality disappointed me and setup took forever.'"
}
],
"max_tokens": 100
}Output
{
"model": "openai/gpt-5-nano-2025-08-07",
"usage": {
"cost": 0.0000276,
"is_byok": false,
"cost_details": {
"upstream_inference_cost": 0.0000276,
"upstream_inference_prompt_cost": 0.000002,
"upstream_inference_completions_cost": 0.0000256
},
"total_tokens": 104,
"prompt_tokens": 40,
"completion_tokens": 64,
"prompt_tokens_details": {
"audio_tokens": 0,
"video_tokens": 0,
"cached_tokens": 0,
"cache_write_tokens": 0
},
"completion_tokens_details": {
"audio_tokens": 0,
"image_tokens": 0,
"reasoning_tokens": 64
}
},
"content": ""
}Tags
x402
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