POST /webhooks/spectrum200 OK
{
"type": "ADDRESS_ACTIVITY",
"category": "token",
"value": "1000",
"asset": { "symbol": "USDC" },
"blockNumber": 19000000,
"removed": false
}
HMAC ✓X-Spectrum-Signature: t=…,v1=…
Push, don't poll
On-chain events, the moment they happen
Spectrum Webhooks watches the chain and pushes a signed HTTPS request to your endpoint whenever an address you care about moves value. No polling, no node to run, no missed blocks, just a clean JSON payload for every relevant event.
1 block
Typical delivery latency
Pushed the moment an event is confirmed
At-least-once
Durable, retried delivery
Retries until your server returns 2xx
Replace your indexer and your polling loops
Building on-chain usually means running an archive node with a custom indexer, or hammering a public RPC with polling that is slow, rate-limited, and still misses reorgs. Webhooks replaces both.
Stop polling
Get a push the instant an event is confirmed, typically within one block. No loops, no rate limits, no missed blocks.
Never miss an event
Durable, at-least-once delivery with automatic retries survives your endpoint being down, then a dead-letter queue you can replay.
Reorg-aware
When the chain reorganizes we flag which events to roll back, so you are never quietly left holding bad data.
Signed and verifiable
Every POST is HMAC-signed with a per-webhook secret and timestamp, so you can prove origin and reject replays.
From on-chain event to your endpoint
We ingest and decode every block, match it against your filters, sign it, and deliver, retrying until your server acknowledges. Everything is durably queued first, so an outage on either side never loses an event.
On-chain event
Block confirmed
HMAC
Spectrum
Decode & sign
Your endpoint
Verify & 2xx
On-chain event
Block confirmed
HMAC
Spectrum
Decode & sign
Your endpoint
Verify & 2xx
- 1
Ingest and decode
We subscribe to the chain and decode every block: native, internal, and token transfers.
- 2
Match your filters
Each event is matched against your webhook's addresses, token, and category filters.
- 3
Sign and batch
Matching events are batched by block, signed with your secret, and ordered deterministically.
- 4
Deliver and retry
We POST to your endpoint and retry with backoff until 2xx; persistent failures go to a dead-letter queue.
Every kind of transfer, decoded
Watch an address as sender or receiver, narrowed by token contract and category. Every event arrives with human-readable amounts and token metadata, so you never need a second RPC call to make sense of it.
externalNative coin transfers (e.g. ETH) sent as a top-level transaction.
internalNative value moved inside a contract call, recovered from execution traces and invisible in logs.
tokenERC-20 fungible token transfers, with symbol and decimals resolved.
erc721NFT transfers, including the tokenId.
erc1155Single and batch multi-token transfers.
Built for every on-chain trigger
One durable, signed event stream behind deposit detection, treasury monitoring, payments, alerting, and analytics.
Deposit detection
Credit users the moment funds land on your hot or deposit addresses, including internal transfers that log-only services miss.
Treasury monitoring
An audit trail of every inflow and outflow for your org wallets, with amounts already denominated in token units.
NFT activity feeds
Track mints, sales, and transfers for a collection or a set of holders in real time.
Payments and invoicing
Trigger fulfillment the instant a specific token payment hits your receiving address.
Security and alerting
Fire a Slack or PagerDuty alert when a monitored treasury or multisig moves unexpectedly.
Analytics pipelines
Stream decoded, normalized on-chain events straight into your data warehouse without running an indexer.
Start delivering
Ship real-time on-chain events today
Create a webhook, point it at your endpoint, and start receiving signed, decoded events. No nodes, no polling, no missed blocks.
Free tier included · No credit card required