Locus public pay-per-use API

[
  {
    "scheme": "upto",
    "network": "eip155:8453",
    "payTo": "0x3C5CBe28ECA3b96023c45D3f877da834F1C7d5fA",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "14747",
    "maxTimeoutSeconds": 1800
  }
]

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "max_tokens": 1,
          "messages": [
            {
              "content": "Hello from x402",
              "role": "user"
            }
          ],
          "model": "mistral-medium-3-5"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "data": {},
          "payment": {
            "authorizedMaxUsdc": "0.001000",
            "scheme": "exact",
            "settledUsdc": "0.001000"
          },
          "request": {
            "id": "00000000-0000-4000-8000-000000000000",
            "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
          },
          "success": true
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "additionalProperties": true,
              "properties": {
                "max_tokens": {
                  "description": "Maximum output tokens. Required to bound metered x402 authorization.",
                  "type": "number"
                },
                "messages": {
                  "description": "Conversation messages array",
                  "items": {
                    "additionalProperties": true,
                    "type": "object"
                  },
                  "type": "array"
                },
                "model": {
                  "description": "Model ID (e.g. \"mistral-medium-3-5\", \"mistral-small-2603\", \"mistral-large-2512\", \"ministral-14b-2512\", \"codestral-latest\")",
                  "type": "string"
                },
                "response_format": {
                  "additionalProperties": true,
                  "description": "Output format (json_object, json_schema, text)",
                  "type": "object"
                },
                "seed": {
                  "description": "Deterministic sampling seed",
                  "type": "number"
                },
                "stop": {
                  "description": "Stop sequences",
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "temperature": {
                  "description": "Sampling temperature (0-2)",
                  "type": "number"
                },
                "tool_choice": {
                  "additionalProperties": true,
                  "description": "Tool selection control",
                  "type": "object"
                },
                "tools": {
                  "description": "Tool/function definitions",
                  "items": {
                    "type": "string"
                  },
                  "type": "array"
                },
                "top_p": {
                  "description": "Nucleus sampling (0-1)",
                  "type": "number"
                }
              },
              "required": [
                "model",
                "messages",
                "max_tokens"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "type": "object"
            },
            "type": {
              "type": "string"
            }
          },
          "required": [
            "type"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "eip2612GasSponsoring": {
    "info": {
      "description": "The facilitator accepts EIP-2612 gasless Permit to `Permit2` canonical contract.",
      "version": "1"
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "amount": {
          "description": "The amount to approve (uint256). Typically MaxUint.",
          "pattern": "^[0-9]+$",
          "type": "string"
        },
        "asset": {
          "description": "The address of the ERC-20 token contract.",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "type": "string"
        },
        "deadline": {
          "description": "The timestamp at which the signature expires.",
          "pattern": "^[0-9]+$",
          "type": "string"
        },
        "from": {
          "description": "The address of the sender.",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "type": "string"
        },
        "nonce": {
          "description": "The current nonce of the sender.",
          "pattern": "^[0-9]+$",
          "type": "string"
        },
        "signature": {
          "description": "The 65-byte concatenated signature (r, s, v) as a hex string.",
          "pattern": "^0x[a-fA-F0-9]+$",
          "type": "string"
        },
        "spender": {
          "description": "The address of the spender (Canonical Permit2).",
          "pattern": "^0x[a-fA-F0-9]{40}$",
          "type": "string"
        },
        "version": {
          "description": "Schema version identifier.",
          "pattern": "^[0-9]+(\\.[0-9]+)*$",
          "type": "string"
        }
      },
      "required": [
        "from",
        "asset",
        "spender",
        "amount",
        "nonce",
        "deadline",
        "signature",
        "version"
      ],
      "type": "object"
    }
  }
}

curl "https://mistral.x402.stage.paywithlocus.com/mistral/chat"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://mistral.x402.stage.paywithlocus.com/mistral/chat");
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://mistral.x402.stage.paywithlocus.com/mistral/chat")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header