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PaySponge AI Chat Completions (x402 Pay-per-Call)
x402
PaySponge AI Chat Completions (x402 Pay-per-Call) is a paid API for AI agents from api.paysponge.com, paid per call via x402, $0.010000/call, status unknown (last checked 2026-09-15, last successful call 2026-08-10).
Generates AI chat completions (OpenAI-compatible) gated by a micro-payment of $0.01 USDC per call via on-chain crypto payment on Base or Solana.
Price / call$0.010000
Success100%
StatusUnknown
How this service works
Service: OpenRouter API (https://api.paysponge.com/chat/completions)
Output
Returns an OpenAI-compatible chat completion object including the assistant's response message, finish reason, prompt and completion token counts, upstream inference cost breakdown, model used, and a provider identifier.
Example use cases
Example prompt
“Ask gpt-4o-mini: 'What are three tips for writing clean Python code?' — pay for this single request with USDC on Base via PaySponge.”
Technical details
Endpoint
POSThttps://api.paysponge.com/x402/purchase/svc_d5zgtpg00dvssgj28/chat/completionsWhen to prefer
Choose this endpoint when you need OpenAI-compatible chat completions without a subscription or API key, and can pay $0.01 USDC per call on-chain via Base (EIP-155:8453) or Solana. Ideal for agents operating in crypto-native environments, anonymous or trustless access patterns, or use cases requiring pay-as-you-go without account registration.
Side effects
- Payment not received or insufficient USDC — returns 402 Payment Required
- Payment timeout exceeded — request rejected before completion
- Invalid or missing 'model' field — returns 400 Bad Request
- Malformed messages array (missing role or content) — returns 400 validation error
- Upstream LLM provider error — proxied 5xx response
- Unsupported model specified — provider may reject with error
Input
{
"model": "gpt-4o-mini",
"messages": [
{
"role": "user",
"content": "Hello"
}
]
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"id": "gen-1776386209-gzI8SU5Y8OM2wRaMGoza",
"model": "openai/gpt-4o-mini",
"usage": {
"cost": 0.0000066,
"is_byok": false,
"cost_details": {
"upstream_inference_cost": 0.0000066,
"upstream_inference_prompt_cost": 0.0000012,
"upstream_inference_completions_cost": 0.0000054
},
"total_tokens": 17,
"prompt_tokens": 8,
"completion_tokens": 9,
"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": 0
}
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello! How can I assist you today?",
"refusal": null,
"reasoning": null
},
"logprobs": null,
"finish_reason": "stop",
"native_finish_reason": "stop"
}
],
"created": 1776386209,
"provider": "OpenAI",
"system_fingerprint": "fp_4debc47fe0"
}Tags
x402
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