558686 Xyz Standard Chat Example

{
  "generated": "2026-09-19",
  "method": "derived",
  "source": "https://gpt55.558686.xyz/v1/chat/completions/standard - the provider's own HTTP 402 quote body, extensions.bazaar.info (probed unpaid 2026-09-20). The request and response examples are the provider's, copied verbatim; the 402 quote around them is what an unpaid caller actually receives.",
  "operationId": "v1ChatCompletionsStandard",
  "note": "GPT-5.6 Luna Standard chat: $0.00293 (2930 atomic USDC) per request; the accepts[0].amount is the live quote and is authoritative immediately before payment.",
  "quote_request": {
    "method": "POST",
    "url": "https://gpt55.558686.xyz/v1/chat/completions/standard",
    "headers": {
      "content-type": "application/json"
    },
    "body": {
      "model": "gpt-5.6-luna",
      "messages": [
        {
          "role": "user",
          "content": "Summarize x402 in one sentence."
        }
      ],
      "max_tokens": 256,
      "stream": false
    }
  },
  "quote_response": {
    "status": 402,
    "headers": {
      "PAYMENT-REQUIRED": "<base64 of the JSON body>",
      "ratelimit-limit": "120",
      "ratelimit-policy": "120;w=60"
    },
    "body": {
      "x402Version": 2,
      "error": "Payment required",
      "resource": {
        "url": "https://gpt55.558686.xyz/v1/chat/completions/standard",
        "description": "GPT-5.6 Luna Standard chat for mainstream short answers, routing decisions, extraction helpers, and buyer trials. The legacy mini path remains available as a compatibility alias. Model tier: GPT-5.6 Luna Standard; upstream model: gpt-5.6-luna. Pay $0.00293 per request with x402 exact USDC on Base or Solana when advertised. Public paid calls are limited to 24000 input characters. Model theoretical max output is 128000 tokens; actual returned output depends on upstream availability, request...",
        "mimeType": "application/json",
        "serviceName": "gpt55-token-gateway",
        "tags": [
          "gpt-5.6-luna",
          "standard",
          "model-tier",
          "openai-compatible",
          "x402-chat"
        ],
        "iconUrl": "https://gpt55.558686.xyz/favicon.ico",
        "category": "ai-text-tools"
      },
      "accepts": [
        {
          "scheme": "exact",
          "network": "eip155:8453",
          "amount": "2930",
          "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "payTo": "0x1f0130669ca6fd02e025a984cc038f139df19a2f",
          "maxTimeoutSeconds": 300,
          "extra": {
            "name": "USD Coin",
            "version": "2",
            "x402Provider": "xpay"
          }
        }
      ]
    }
  },
  "paid_request": {
    "method": "POST",
    "url": "https://gpt55.558686.xyz/v1/chat/completions/standard",
    "headers": {
      "content-type": "application/json",
      "X-PAYMENT": "<x402 exact payment payload signed by the buyer wallet for accepts[0]>"
    },
    "body": {
      "model": "gpt-5.6-luna",
      "messages": [
        {
          "role": "user",
          "content": "Summarize x402 in one sentence."
        }
      ],
      "max_tokens": 256,
      "stream": false
    },
    "note": "Same request as the quote; only the X-PAYMENT header is added (sameRequestRetryRequired: true)."
  },
  "paid_response_example": {
    "status": 200,
    "headers": {
      "PAYMENT-RESPONSE": "<settlement receipt>",
      "x-x402-receipt-id": "<receipt id>",
      "x-x402-receipt-url": "<receipt url>"
    },
    "body": {
      "id": "chatcmpl_example",
      "object": "chat.completion",
      "model": "gpt-5.6-luna",
      "choices": [
        {
          "index": 0,
          "message": {
            "role": "assistant",
            "content": "A concise answer from GPT-5.6 Luna."
          },
          "finish_reason": "stop"
        }
      ],
      "usage": {
        "prompt_tokens": 32,
        "completion_tokens": 12,
        "total_tokens": 44
      }
    }
  },
  "output_schema": {
    "type": "object",
    "properties": {
      "type": {
        "type": "string"
      },
      "example": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "object": {
            "type": "string"
          },
          "model": {
            "type": "string"
          },
          "choices": {
            "type": "array"
          },
          "usage": {
            "type": "object"
          }
        },
        "required": [
          "id",
          "object",
          "model",
          "choices"
        ],
        "additionalProperties": true
      }
    },
    "required": [
      "type"
    ]
  }
}