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GPT-5.3 Codex Chat Completions via x402 (GET)
x402
GPT-5.3 Codex Chat Completions via x402 (GET) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.007472/call, status unknown (last checked 2026-09-15).
Generates GPT-5.3-Codex coding-oriented chat completions via GET query parameters, paid per-request with USDC over x402.
Price / call$0.007472
Success—
StatusUnknown
How this service works
GPT-5.6 Luna API Base USDC and OpenAI-compatible x402 chat: one request for $0.00293, paid by browser wallet or a quote-first agent fallback.
Output
Returns an OpenAI-compatible chat completion object containing an id, model name, choices array with assistant message content (typically code or structured development output), and a usage object with token counts. Actual output length depends on upstream availability, request parameters, and account policy up to 128000 tokens.
Example use cases
Generate code for REST API
“Use the GPT-5.3 Codex model to write a Node.js REST API endpoint that handles user authentication with JWT tokens — pay per call with USDC and keep the output concise.”
Plan a software refactor
“I need to refactor a legacy Python monolith into microservices — can you use GPT-5.3 Codex to create a structured patch plan with file-by-file changes and keep it under 3000 tokens?”
Fix a bug in code
“There's a bug in my TypeScript async function where promises aren't being awaited correctly — can you ask the GPT-5.3 Codex model to diagnose and fix it, using a pay-per-call USDC request?”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/chat/completions/gpt-5.3-codexWhen to prefer
Choose this endpoint when you need coding-oriented GPT chat completions (patch planning, code generation, structured dev output) via a simple GET request with x402 USDC micropayment on Base or Solana, without needing a long-lived API key. Ideal for AI agents that support x402 payment flows and want Codex-class output on a pay-per-call basis.
Side effects
- Payment not provided or insufficient — 402 Payment Required returned
- Input exceeds 700000 character limit — request rejected
- Upstream model unavailable — 503 or timeout error
- Invalid model enum value in query param — 400 Bad Request
- max_tokens out of range (must be 1–128000) — validation error
- Missing required 'input' query parameter — 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl_example",
"model": "gpt-5.6-luna",
"usage": {
"total_tokens": 44,
"prompt_tokens": 32,
"completion_tokens": 12
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "A concise answer from GPT-5.5."
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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