BitBooth Webhook Signature Verify: pay 0.005 USDC, verify a webhook signature against t…

What it does

BitBooth Webhook Signature Verify: pay 0.005 USDC, verify a webhook signature against the provider's canonical HMAC scheme. Supports stripe, github, vercel, cdp, slack, and generic HMAC-SHA256. Constant-time compare, clock-skew tolerance on timestamp-bearing providers (Stripe / Slack / CDP). Stateless — caller supplies their secret in the request body, we never store it.

Tags: bazaar

Call contract

Method

POST

Input

json

Output

json

Last paid call

2026-10-06

{
  "payload": "{\"id\":\"evt_test\",\"type\":\"checkout.session.completed\"}",
  "provider": "stripe",
  "secret": "whsec_test_secret",
  "signature": "t=1640000000,v1=abc...",
  "timestamp": "1640000000",
  "toleranceSeconds": 300
}

{
  "details": {
    "ageSeconds": 14,
    "checkedTolerance": true
  },
  "ok": true,
  "payment": {
    "network": "eip155:8453",
    "payer": "0xbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
    "transaction": "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
  },
  "provider": "stripe",
  "scheme": "hmac-sha256-stripe",
  "valid": true
}

Use with an agent

1. Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
2. Inspect. Fetch /resources/40204.json for the price and payment options.
3. Pay. Call GET https://app.heinrichstech.com/v1/cdp/webhook-sig-verify. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
4. Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Solana, xrpl:0, stellar:pubnet, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price

$0.005 / request

Protocol

x402 v2

Auth

No account or API key. Pay per request.

Networks

Base, Solana, xrpl:0, stellar:pubnet

Demand

1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDa2F35d283c42dd60B965322394bc658a5c1769F",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "EDtPHNFA6ofGQZPb8NYUxdTkqVwCfkWJzRCg8vQXkYBL",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "xrpl:0",
    "payTo": "rfryheo6yzFdLWj8qUQtZc7zG9MKkBkUEy",
    "asset": "524C555344000000000000000000000000000000",
    "amount": "0.005000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "xrpl:0",
    "payTo": "rfryheo6yzFdLWj8qUQtZc7zG9MKkBkUEy",
    "asset": "5553444300000000000000000000000000000000",
    "amount": "0.005000",
    "maxTimeoutSeconds": 120
  },
  {
    "scheme": "exact",
    "network": "stellar:pubnet",
    "payTo": "GCB5WZT5VCBBATGMQMTB6TLUXD6KQC6N5ITRWK3CCP4J3YOCE45FA2GO",
    "asset": "USDC",
    "amount": "50000",
    "maxTimeoutSeconds": 120
  }
]

Schemas

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

{
  "example": {},
  "type": "string"
}

Examples

curl -X POST 'https://app.heinrichstech.com/v1/cdp/webhook-sig-verify' -H 'Content-Type: application/json' --data '{"payload":"{\"id\":\"evt_test\",\"type\":\"checkout.session.completed\"}","provider":"stripe","secret":"whsec_test_secret","signature":"t=1640000000,v1=abc...","timestamp":"1640000000","toleranceSeconds":300}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

const res = await fetch("https://app.heinrichstech.com/v1/cdp/webhook-sig-verify", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"payload\":\"{\\\"id\\\":\\\"evt_test\\\",\\\"type\\\":\\\"checkout.session.completed\\\"}\",\"provider\":\"stripe\",\"secret\":\"whsec_test_secret\",\"signature\":\"t=1640000000,v1=abc...\",\"timestamp\":\"1640000000\",\"toleranceSeconds\":300}"
});
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
import json
res = httpx.request("POST", "https://app.heinrichstech.com/v1/cdp/webhook-sig-verify", json=json.loads("{\"payload\":\"{\\\"id\\\":\\\"evt_test\\\",\\\"type\\\":\\\"checkout.session.completed\\\"}\",\"provider\":\"stripe\",\"secret\":\"whsec_test_secret\",\"signature\":\"t=1640000000,v1=abc...\",\"timestamp\":\"1640000000\",\"toleranceSeconds\":300}"))
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider

app.heinrichstech.com

Endpoint

https://app.heinrichstech.com/v1/cdp/webhook-sig-verify

Machine-readable

/resources/40204.json