The Notifications API allows you to receive real-time blockchain activity updates such as native transfers, token movements, NFT interactions, contract events, and fee payments all via webhooks.
Notification Types
The following event types are supported across different chains:
- ADDRESS_EVENT - Triggered for any address-level event or transaction.
- CONTRACT_ADDRESS_LOG_EVENT - Captures smart contract logs (EVM-based chains).
- FAILED_TXS_PER_BLOCK - Detects failed transactions within a block.
- INCOMING / OUTGOING_FUNGIBLE_TX - Detects ERC20 or equivalent token transfers.
- INCOMING / OUTGOING_NATIVE_TX - Detects native currency transfers (ETH, MATIC, etc.).
- INCOMING / OUTGOING_NFT_TX - Detects NFT transfers (ERC721 / ERC1155).
- INCOMING / OUTGOING_MULTITOKEN_TX - Multi-token event detection (ERC1155).
- INCOMING / OUTGOING_INTERNAL_TX - Tracks internal transactions (calls within a transaction).
- PAID_FEE - Captures gas fee payments by an address.
Supported Chains
Chain | Type | Supported Notifications |
|---|---|---|
Ethereum Mainnet | EVM | All notification types |
Polygon Mainnet | EVM | All notification types |
BSC Mainnet | EVM | All notification types |
Arbitrum One | EVM | All notification types |
Optimism Mainnet | EVM | All notification types |
Base Mainnet | EVM | All notification types |
Berachain Mainnet | EVM | All notification types |
Avalanche Mainnet | EVM | All notification types |
Celo Mainnet | EVM | All notification types |
Chiliz Mainnet | EVM | All notification types |
Cronos Mainnet | EVM | All notification types |
Fantom Mainnet | EVM | All notification types |
Kaia Mainnet | EVM | All notification types |
Klaytn Cypress | EVM | All notification types |
Flare Mainnet | EVM | All notification types |
Songbird Mainnet | EVM | All notification types |
Unichain Mainnet | EVM | All notification types |
| EVM | All notification types |
Ethereum Sepolia | EVM | All notification types |
Ethereum Holesky | EVM | All notification types |
Celo Testnet | EVM | All notification types |
BSC Testnet | EVM | All notification types |
Polygon Amoy | EVM | All notification types |
Flare Coston / Coston2 | EVM | All notification types |
Kaia Kairos | EVM | All notification types |
Klaytn Baobab | EVM | All notification types |
Other Supported Chains
| Chain | Type | Supported Notifications |
|---|---|---|
| Tezos Mainnet | Non-EVM | 13 notification types (no multi-token support) |
| Tron Mainnet | Non-EVM | 13 notification types (no multi-token support) |
| Solana Mainnet | SVM | 9 notification types (no internal or contract log events) |
| Ripple Mainnet | XRPL | 4 notification types (native transfers + paid fee) |
| Bitcoin Mainnet | UTXO | 3 notification types (native transfers only) |
| Litecoin Mainnet | UTXO | 3 notification types (native transfers only) |
| Dogecoin Mainnet | UTXO | 3 notification types (native transfers only) |
| Bitcoin Cash Mainnet | UTXO | 1 notification type (address event only) |
Summary
| Support Level | Notification Coverage | Example Chains |
|---|---|---|
| 🟢 Full Support | All 15 types | Ethereum, Polygon, BSC, Base, Arbitrum, Optimism |
| 🟡 Partial Support | 9–13 types | Solana, Tron, Tezos |
| 🔵 Native-Only Support | 3–4 types | Bitcoin, Litecoin, Dogecoin, Ripple |
| ⚫ Limited Support | 1 type | Bitcoin Cash |
Notifications FAQs
Which testnets are supported for Notifications?
The following testnets are supported for real-time notification tracking:
- Ethereum Sepolia, Ethereum Holesky
- Polygon Amoy
- BSC Testnet, Celo Testnet
- Flare Coston, Flare Coston2
- Kaia Kairos, Klaytn Baobab
- Monad Testnet
- Avalanche Testnet, Optimism Testnet, Fantom Testnet
- Base Sepolia
- Tezos Testnet, Tron Testnet
- Solana Devnet, Ripple Testnet
- Bitcoin Testnet, Litecoin Testnet, Dogecoin Testnet
- Bitcoin Cash Testnet
Why do some chains have fewer notification types?
Blockchain architectures differ in how they expose transaction and event data:
- EVM chains support all notification types, including logs and internal calls.
- SVM chains (Solana) support transfers and program events, but not internal calls.
- UTXO chains (Bitcoin, Litecoin, Dogecoin) support native transfer tracking only.
- XRPL (Ripple) supports native payments and fee tracking.
How fast are notifications delivered?
Notifications are typically delivered within 1–3 seconds of block confirmation, depending on the chain’s consensus and finality model.
Can I subscribe to multiple notification types for one address?
Yes — you can subscribe a single address to multiple event types such as native, token, and NFT transfers simultaneously. Manage all subscriptions easily via the Notifications API.
Which chains were recently added?
- 🆕 Unichain Mainnet
- 🆕 Berachain Mainnet
- 🆕 Monad Testnet