Know the moment
money moveson any chain
Watch any address or contract and get a signed webhook the instant funds move. No nodes to run, no polling loop to babysit, no missed deposit.
Everything a deposit needs
Generate the address, watch it, and hear about it — without standing up a single node.
HD wallet generation
Derive wallets with BIP39/BIP44 across 21 coin types. Stateless — we keep nothing.
Real-time monitoring
Watch any address or contract across EVM, Bitcoin, TRON, Solana and more. Events land as they happen.
Webhook delivery
HMAC-signed and retried with backoff. Filter by event type, direction and value range.
31+ blockchains
EVM, Bitcoin, TRON, Solana, Cardano, Polkadot, TON, Aptos — testnets included. One API for all of it.
Event filtering
Native transfers, ERC-20, ERC-721, approvals — filtered by direction and value before they reach you.
Key management
Separate keys for sandbox and live, with usage tracked per key.
Forwarding wallets
Sweep deposits onward automatically, under rules you set — token whitelists and amount caps.
Programmable rules
Cap amounts, whitelist tokens, auto-refund anything that breaks the rule — with the event trail to prove it.
Watching a wallet, start to finish
Derive an address, subscribe to it, and point the events at your endpoint.
POST /api/v1/webhooks/
{"name":"Production","url":"https://yourapp.com/fluxrail/events","secret":"your-hmac-secret"}
# ← {"id": 1}
# 2. Derive an address to hand your customer
POST /api/v1/wallet/derive/
{"mnemonic":"word1 word2 ...","coin":"ethereum","index":0}
# ← {"address": "0x742d35Cc..."}
# 3. Watch it — and say which events you care about
POST /api/v1/subscriptions/
{"name":"Watch ETH wallet","chain_slug":"ethereum",
"wallet_addresses":["0x742d35Cc..."],
"event_types":["native_transfer","erc20_transfer"],
"direction":"incoming","webhook":1}
# Funds arrive → your endpoint is called, signed and retried until it sticks.
Choose your plan
Flexible pricing that scales with your needs
Free
Try it out, no card required
- ✓ 100.0K credits (lifetime)
- ✓ 5 subscriptions
- ✓ 1 webhook
- ✓ Community support
Starter
For builders and growing projects
- ✓ 4.0M credits/month
- ✓ 50.0K subscriptions
- ✓ 50 webhooks
- ✓ Standard support
Pro
For production apps
- ✓ 10.1M credits/month
- ✓ 200.0K subscriptions
- ✓ 200 webhooks
- ✓ Priority support
Scale
High-volume platforms
- ✓ 30.6M credits/month
- ✓ 500K subscriptions
- ✓ 500 webhooks
- ✓ Dedicated support
7-day free trial on all paid plans. No credit card required.
Stop polling. Start listening.
The free plan covers five subscriptions, one webhook and 100K lifetime credits — enough to wire the whole thing up before you decide.