Flexible Webhook Stream Types

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Stream type refers to the kind of on-chain data that Flexible Webhook tracks. This is a separate concept from the WebSocket-based Nodit Stream service.

The data schema available for reception varies by the stream type selected by the user. Each field in the schema serves two purposes:

• Receive Fields: Select which fields to include in the webhook payload. All fields in the schema are eligible. You can deselect fields you do not need and receive only the fields you want.
• Condition Fields (Condition): Some fields can also be used as filtering conditions. These are marked with ✓ in the Condition column of the tables below.

Fields currently used in filter conditions cannot be deselected from receive fields. The value format when writing filter conditions varies by field.

• Address fields (e.g., from_address, to_address, token_address): 0x-prefixed checksum address
• Quantity fields (e.g., value, gas_used, receipt_gas_used): string representation of a large integer (bigint)
• Others: use the field's Type as-is

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All schemas are commonly supported on EVM-compatible chains and have the same structure across all supported chains.

Block

Tracks block creation events.

Field	Type	Condition	Description
base_fee_per_gas	string		EIP-1559 base fee (wei)
blob_gas_used	string		EIP-4844 blob gas used
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
difficulty	string		Block difficulty. 0 after PoS transition
excess_blob_gas	string		Excess blob gas beyond the target
extra_data	string		Arbitrary data included by the block producer
gas_limit	string		Block gas limit
gas_used	string	✓	Total gas used in the block
hash	string		Block hash
log_count	integer	✓	Number of event logs included in the block
logs_bloom	string		Bloom filter for log search
miner	string	✓	Block producer (validator) address
mix_hash	string		PoW verification hash. RANDAO value after PoS
nonce	string		PoW nonce. 0x0 after PoS
parent_beacon_block_root	string		Parent beacon block root hash
parent_hash	string		Parent block hash
receipts_root	string		Transaction receipts Merkle root
requests_hash	string		EIP-7685 requests hash
sha3_uncles	string		Uncle block hash
size	string		Block size (bytes)
state_root	string		State trie Merkle root
transaction_count	integer	✓	Number of transactions included in the block
transactions	array		List of transaction hashes
transactions_root	string		Transaction trie Merkle root
withdrawal_count	integer		Number of validator withdrawals
withdrawals_root	string		Withdrawals trie Merkle root

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ERC-20 Transfer

Tracks ERC-20 token transfer events.

Field	Type	Condition	Description
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
from_address	string	✓	Sender address
log_index	integer		Log index within the block
to_address	string	✓	Recipient address
token_address	string	✓	Token contract address
transaction_hash	string		Transaction hash
transaction_index	integer		Transaction index within the block
value	string	✓	Transfer amount (raw value without decimals applied)

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ERC-721 Transfer

Tracks ERC-721 NFT transfer events.

Field	Type	Condition	Description
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
from_address	string	✓	Sender address
log_index	integer		Log index within the block
to_address	string	✓	Recipient address
token_address	string	✓	NFT contract address
token_id	string	✓	Token ID
transaction_hash	string		Transaction hash
transaction_index	integer		Transaction index within the block

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ERC-1155 Transfer

Tracks ERC-1155 multi-token transfer events.

Field	Type	Condition	Description
batch_index	integer		Index within a batch transfer
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
from_address	string	✓	Sender address
log_index	integer		Log index within the block
operator	string	✓	Operator address that executed the transfer
to_address	string	✓	Recipient address
token_address	string	✓	Token contract address
token_id	string	✓	Token ID
transaction_hash	string		Transaction hash
transaction_index	integer		Transaction index within the block
value	string	✓	Transfer amount (raw value without decimals applied)

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Log

Tracks smart contract event logs.

Field	Type	Condition	Description
address	string	✓	Contract address that emitted the event
block_hash	string		Block hash
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
data	string		Non-indexed event data (hex)
log_index	integer		Log index within the block
removed	boolean	✓	Whether the log was removed due to chain reorganization (reorg)
topics	array		Event topics array
topics[0]	array element	✓	event signature hash (filter only)
topics[1]	array element	✓	First indexed parameter (filter only)
topics[2]	array element	✓	Second indexed parameter (filter only)
topics[3]	array element	✓	Third indexed parameter (filter only)
transaction_hash	string		Transaction hash
transaction_index	integer		Transaction index within the block

topics[0] through topics[3] are filter-condition-only fields. In received data, they are delivered as the topics array.

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Transaction Receipt

Tracks transaction execution results (receipts).

Field	Type	Condition	Description
access_list	array		EIP-2930 access list
authorization_list	array		EIP-7702 authorization list
blob_versioned_hashes	array		EIP-4844 blob versioned hash list
block_hash	string		Block hash
block_number	integer		Block number
block_timestamp	integer		Block creation time (Unix timestamp)
from_address	string	✓	Transaction sender address
gas	string		Transaction gas limit
gas_price	string		Gas price (wei)
hash	string		Transaction hash
input	string	✓	Transaction input data (calldata, hex)
max_fee_per_blob_gas	string		EIP-4844 max fee per blob gas
max_fee_per_gas	string		EIP-1559 max fee per gas
max_priority_fee_per_gas	string		EIP-1559 priority fee per gas
nonce	string		Transaction sequence number of the sender address
receipt_blob_gas_price	string		Actual blob gas price applied
receipt_blob_gas_used	string		Amount of blob gas used
receipt_contract_address	string		Deployed address for contract creation transactions
receipt_cumulative_gas_used	string		Cumulative gas used within the block
receipt_effective_gas_price	string		Actual gas price applied
receipt_gas_used	string	✓	Actual amount of gas used
receipt_logs_bloom	string		Bloom filter for log search
receipt_root	string		State root (pre-Byzantium compatibility)
receipt_status	string	✓	Execution result (`0x0`: failure, `0x1`: success)
to_address	string	✓	Transaction recipient address
transaction_index	integer		Transaction index within the block
transaction_type	string		Transaction type (`0x0`: legacy, `0x2`: EIP-1559, etc.)
value	string	✓	Native token transferred (wei)