BitBooth echo endpoint — pays a tiny USDC fee, returns a JSON echo

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDa2F35d283c42dd60B965322394bc658a5c1769F",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "EDtPHNFA6ofGQZPb8NYUxdTkqVwCfkWJzRCg8vQXkYBL",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "xrpl:0",
    "payTo": "rfryheo6yzFdLWj8qUQtZc7zG9MKkBkUEy",
    "asset": "524C555344000000000000000000000000000000",
    "amount": "0.001000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "xrpl:0",
    "payTo": "rfryheo6yzFdLWj8qUQtZc7zG9MKkBkUEy",
    "asset": "5553444300000000000000000000000000000000",
    "amount": "0.001000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "stellar:pubnet",
    "payTo": "GCB5WZT5VCBBATGMQMTB6TLUXD6KQC6N5ITRWK3CCP4J3YOCE45FA2GO",
    "asset": "USDC",
    "amount": "10000",
    "maxTimeoutSeconds": 120
  }
]

{
  "bazaar": {
    "category": "utility",
    "discoverable": true,
    "info": {
      "input": {
        "body": {
          "message": "hello bitbooth"
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "ok": true,
          "payment": {
            "network": "eip155:8453",
            "payer": "0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
            "transaction": "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
          },
          "protocol": "x402 + CDP Facilitator",
          "service": "BitBooth /v1/cdp/echo",
          "timestamp": "2026-05-05T12:00:00.000Z",
          "youSent": "hello bitbooth"
        },
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "properties": {
                "message": {
                  "description": "Optional string to echo back in the response. Max 500 chars.",
                  "maxLength": 500,
                  "type": "string"
                }
              }
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "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"
    },
    "tags": [
      "reference",
      "demo",
      "x402"
    ]
  }
}

curl "https://app.heinrichstech.com/v1/cdp/echo"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

const res = await fetch("https://app.heinrichstech.com/v1/cdp/echo");
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://app.heinrichstech.com/v1/cdp/echo")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header