Off the Hook is a webhook notification service built specifically for TRON. You create a subscription, point it at your HTTPS endpoint, and add the addresses you want to watch. Within seconds of a matching transfer hitting the chain, Off the Hook signs a payload with HMAC-SHA256 and POSTs it to your endpoint — no polling, no custom indexing, no infrastructure to run.Documentation Index
Fetch the complete documentation index at: https://docs.offthehook.dev/llms.txt
Use this file to discover all available pages before exploring further.
Why TRON needs a dedicated service
TRON moves more USDT volume than Ethereum and processes roughly ten times the daily transactions, yet the major webhook providers — Alchemy Notify, QuickNode Streams, Moralis Streams — treat TRON as an afterthought or skip it entirely. Off the Hook exists to close that gap. It covers native TRX transfers and every TRC-20 token, so you get the same notification quality on TRON that other providers deliver on Ethereum.What makes Off the Hook different
Off the Hook is built on the Standard Webhooks specification. That means the delivery format, signing algorithm, and header names are an open standard — not a proprietary wire format you have to reverse-engineer. Any Standard Webhooks-compatible verification library (including Svix’s open-source clients) works out of the box. Chains and addresses are identified with CAIP-2 identifiers (tron:mainnet, tron:nile, tron:shasta). CAIP-2 IDs appear in every API request and every webhook payload, so your code never has to guess which network a transfer came from.
Key features
- Real-time delivery — TRON blocks are polled every three seconds; matched transfers are queued and delivered immediately.
- Automatic retries — failed deliveries are retried at 200 ms, 1 s, 5 s, 1 min, 5 min, 30 min, and 2 h. The same
webhook-idis sent on every attempt so you can deduplicate on your side. - HMAC-SHA256 signing — every delivery is signed over
{id}.{timestamp}.{body}per the Standard Webhooks spec. Reject any request that fails verification. - Multi-secret rotation — rotate your signing secret without dropping deliveries. Both the old and new secrets are valid during a configurable grace window.
- Per-address filtering — subscriptions watch specific addresses, not entire chains. Each address is scoped to a chain ID so the same subscription can span Mainnet and a testnet simultaneously.
- Native TRX and all TRC-20s — one event type (
wallet.transfer.broadcasted) covers both native TRX and every TRC-20 token. The asset details — symbol, decimals, contract address — are in the payload.
Supported chains
| Network | CAIP-2 ID | Purpose |
|---|---|---|
| TRON Mainnet | tron:mainnet | Production |
| TRON Nile | tron:nile | Testnet |
| TRON Shasta | tron:shasta | Testnet |
Start building
Quick start
Create your first subscription and receive a live notification in four steps.
Authentication
Learn how to pass your API key on every request.
Subscriptions
Understand the subscription resource — destinations, events, and address filters.
API reference
Browse the full REST API with request and response schemas.