Skip to content
Chainhook
Sign in

Polygon WBTC transfer notifications, delivered as webhooks

Get a signed webhook when a Polygon address sends or receives (PoS) Wrapped BTC (WBTC). Chainhook waits 64 blocks, about 2 minutes, then posts the transfer to your endpoint.

Start for freeAPI reference

WBTC on Polygon at a glance

The contract Chainhook watches, how amounts are scaled, and how long WBTC takes to reach your endpoint.

Token
(PoS) Wrapped BTC (WBTC)
Network
Polygon
Contract
0x1bfd67037b42cf73acf2047067bd4f2c47d9bfd6
Decimals
8
Confirmations
64
Time to webhook
About 2 minutes

How WBTC ERC-20 webhooks work

Polygon blocks arrive every second or two, and short reorgs have historically been more common than on Ethereum. A home-grown poller has to re-check recent blocks and undo credits when they change. Chainhook waits 64 blocks first, so an event you receive is already settled.

  1. Register the address

    Create a webhook with network: "polygon", type: "token" and the address you want to watch. The signing secret is returned once.

  2. Chainhook waits for confirmations

    Every Polygon block is scanned. A matching WBTC transfer is held until it is 64 blocks deep, about 2 minutes.

  3. Your endpoint gets a signed POST

    A transfer.detected event arrives with an X-Webhook-Signature header. Failed attempts are retried automatically, up to 3 attempts in total, waiting 1 minute, then 5 minutes between attempts.

POST /v1/webhooks

{
  "network": "polygon",
  "type": "token",
  "direction": "in",
  "address": "0x5bf5a1da194ed738308ecbfcfa38f6e1dc50ace5",
  "webhook_url": "https://api.example.com/webhooks/chainhook"
}

Sample webhook payload

What your endpoint receives for an incoming WBTC transfer on Polygon. amount is already scaled by decimals; amount_raw is the on-chain integer.

WBTC on Polygon

POST /webhooks/chainhook HTTP/1.1
Host: api.example.com
Content-Type: application/json
User-Agent: chainhook/1.x
X-Webhook-Id: 01a0fbfd-4fe4-7a3c-8f21-6b9d0e4c7a15
X-Webhook-Signature: 7a12d02673420517279805cf8188a1a62c6f69706161ba5cf0a8ec91ea66b8e3

{
  "id": "01a0fbfd-4fe4-7a3c-8f21-6b9d0e4c7a15",
  "event": "transfer.detected",
  "created_at": "2026-10-02T09:41:17Z",
  "webhook_id": "01a0fbf2-fadc-7c3e-9b1a-4d6f2e8a5c71",
  "data": {
    "network": "polygon",
    "direction": "in",
    "type": "token",
    "transaction_hash": "0x67763c903d65883ad9d7c00d22dcdea576a4187519f80744fa85dd3efb96f592",
    "transfer_index": 12,
    "block_number": 95905610,
    "block_hash": "0x0e8a9ad08897f58628f8f09b65e33eaa2238864f831f62216fcbdf8c7330d817",
    "block_timestamp": "2026-10-02T09:41:05Z",
    "confirmations": 64,
    "from": "0x5b8ddac816baad6111c7c7b39c88355c00ba7ea1",
    "to": "0x5bf5a1da194ed738308ecbfcfa38f6e1dc50ace5",
    "currency": "WBTC",
    "amount": "0.5",
    "amount_raw": "50000000",
    "decimals": 8,
    "contract_address": "0x1bfd67037b42cf73acf2047067bd4f2c47d9bfd6"
  }
}

Verify the signature

X-Webhook-Signature is a hex HMAC-SHA256 of the raw body, keyed with your webhook's secret. Reject any request where it doesn't match.

import crypto from 'node:crypto';
import express from 'express';

const app = express();

app.post(
  '/webhooks/chainhook',
  express.raw({ type: 'application/json' }),
  (req, res) => {
    const signature = req.get('X-Webhook-Signature') ?? '';
    const expected = crypto
      .createHmac('sha256', process.env.CHAINHOOK_SIGNING_SECRET)
      .update(req.body)
      .digest('hex');

    const valid =
      signature.length === expected.length &&
      crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));

    if (!valid) {
      return res.sendStatus(401);
    }

    const event = JSON.parse(req.body);
    // Skip event.id if you've already processed it.

    res.sendStatus(200);
  },
);

Crediting WBTC deposits safely

A wrapped asset

(PoS) Wrapped BTC (WBTC) is a wrapped ERC-20 token that tracks another asset on Polygon. Chainhook detects it as a token, separately from any native coin on the network.

Only this contract

Chainhook watches 0x1bfd67037b42cf73acf2047067bd4f2c47d9bfd6. Versions of WBTC bridged to Polygon through other routes are separate tokens and are not reported.

8 decimals

WBTC on Polygon uses 8 decimals. Credit the amount string, or scale amount_raw by decimals; never parse amounts as floating-point numbers.

Credit once per transfer

Delivery is at least once. Store the event id, or transaction_hash with transfer_index, and skip events you have already processed.

Pay per detection

Start with 100 trial detections for 1 month and pay only for what you use. Paid plans add detections, webhooks, and per-detection overage.

  • Pay as you go

    $0/month

    Card required, no monthly fee

    • 100 trial detections for 1 month
    • 3 active webhooks
    • $0.001 per detection after the trial
    • Decoded transfers, delivered once confirmed
    Start for free

  • Starter

    $9/month

    or $90/year billed yearly

    • 25,000 detections a month
    • 25 active webhooks
    • $0.0006 per extra detection
    • Decoded transfers, delivered once confirmed
    Subscribe
  • Recommended

    Growth

    $29/month

    or $290/year billed yearly

    • 100,000 detections a month
    • 100 active webhooks
    • $0.0003 per extra detection
    • Decoded transfers, delivered once confirmed
    Subscribe

  • Scale

    $99/month

    or $990/year billed yearly

    • 400,000 detections a month
    • 200 active webhooks
    • $0.0002 per extra detection
    • Decoded transfers, delivered once confirmed
    Subscribe

Enterprise

Custom limits for teams that need more than 400,000 detections a month or more than 200 active webhooks. Contact us and we'll set up a plan around your volume.

Contact support

Prices in USD, plus applicable tax. Billed monthly or yearly, and paid allowances reset monthly. Cancel any time and keep your plan until the period ends.

Compare plans and estimate your bill

WBTC on Polygon questions

Can't find your answer? Contact support.

What is the WBTC contract address on Polygon?

0x1bfd67037b42cf73acf2047067bd4f2c47d9bfd6, with 8 decimals.

How do I detect an incoming WBTC transfer on Polygon?

Create a webhook with network: "polygon", type: "token", direction: "in" and the receiving address. Each confirmed WBTC transfer arrives as a transfer.detected event.

How long until a WBTC transfer is reported?

About 2 minutes. Chainhook waits 64 blocks on Polygon before it sends the event.

Does Chainhook need my private key?

No. Chainhook only reads public blockchain data. You register a public address and receive events about it.

Watch your first wallet

Create an account and start with 100 trial detections for 1 month.

Start for free