LLM chat completions for AI agents — no API key, no account, no signup; pay per call in US

[
  {
    "scheme": "exact",
    "network": "base",
    "payTo": "0xE0Ed7A30589Fec49e98F2085c7162B90FdbB83de",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "max_tokens": {
            "description": "Max completion tokens. Default 800, max 2000.",
            "type": "number"
          },
          "messages": {
            "description": "Chat messages [{ role, content }]. Alternative to prompt.",
            "type": "array"
          },
          "model": {
            "description": "Optional model slug; still falls back through the chain.",
            "type": "string"
          },
          "prompt": {
            "description": "User prompt. Provide this or messages[].",
            "type": "string"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "content": "The answer is ...",
          "latency_ms": 1200,
          "model": "deepseek/deepseek-chat",
          "usage": {
            "completion_tokens": 80,
            "prompt_tokens": 24,
            "total_tokens": 104
          }
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "properties": {
            "body": {
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {},
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  }
}

curl "https://uxus.finance/api/llm"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://uxus.finance/api/llm");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

import httpx
res = httpx.get("https://uxus.finance/api/llm")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header