# How to Monitor Crypto Addresses with Webhooks

Get a callback the instant an address receives a payment, a token transfer lands, or a new block is mined — across Bitcoin, Ethereum and 20+ chains. Subscribe once and your app reacts in real time, with no polling and no node to run.

## Read-only by design

Monitoring observes public on-chain activity for the addresses you name. It never touches a private key — a subscription just watches public data and posts a callback.

## Set it up in three steps

1. **Expose an HTTPS callback URL.** Stand up an endpoint that accepts POST callbacks and verify your callback domain once in the dashboard.
2. **Subscribe an address to an event.** Create a subscription for the address and the event you care about — confirmed coin transactions, token transfers, or new blocks. You get a `referenceId` back to manage it later.
   `POST /blockchain-events/{blockchain}/{network}/address-coins-transactions-confirmed`
3. **Handle the callback.** When the event confirms, CryptoAPIs POSTs the details to your URL — react in your app, update an order, credit a balance. Subscribe to token transfers (`/address-tokens-transactions-confirmed`) or new blocks (`/new-block`) the same way.

## What you can watch

Confirmed and unconfirmed coin transactions, token (ERC-20/TRC-20) transfers, internal transactions, per-confirmation updates, mined transactions and new blocks — across 20+ chains. This is the same real-time layer behind the [accept-crypto-payments](https://cryptoapis.io/guides/accept-crypto-payments) and [automated-forwarding](https://cryptoapis.io/guides/automate-payment-forwarding) flows.

## FAQ

**How do I monitor a crypto address in real time?** Create a webhook subscription on the address for the event you want, and CryptoAPIs POSTs a callback to your URL the moment it confirms — with no polling and no node to run.

**What events can I subscribe to?** Confirmed and unconfirmed coin transactions, token transfers, internal transactions, per-confirmation updates, mined transactions and new blocks, across 20+ chains.

**Do I need to run a node to get webhooks?** No. CryptoAPIs watches the chain for you and calls your endpoint when the event happens. You only need an HTTPS callback URL.

**Is address monitoring custodial?** No. Monitoring is read-only — it observes public on-chain activity for addresses you specify. No keys are involved.

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