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WSS
Messages
subscribe
type:object
unsubscribe
type:object
subscribe_response
type:object
unsubscribe_response
type:object
update
type:object

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Overview

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Subscription Parameters

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chain_id
number
required
Target EVM network. See the Chain enumeration for supported values.
​
pool_uids
string[]
Filter updates to specific BlockDB pool identifiers.
​
token_in_addresses
string[]
Filter by input token addresses (hex strings, 20 bytes, no 0x prefix).

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Message Fields

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pool_uid
string
BlockDB pool identifier.
​
exchange_id
number
Exchange/DEX identifier.
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type_id
number
Pool type identifier.
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block_number
number
Block height where the swap occurred.
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block_time
string
Block time (ISO-8601).
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tx_index
number
Transaction index.
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log_index
number
Log index.
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token_in
string
Address of the input token.
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token_out
string
Address of the output token.
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fee_token
string
Token address the fee is denominated in.
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amount_in
string
Executed input amount (raw units, integer string).
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amount_out
string
Executed output amount (raw units, integer string).
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fee_amount_total
string
Total fee amount in fee_token units.
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fee_amount_user
string | null
User/LP share of fees (raw units, nullable).
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fee_amount_protocol
string | null
Protocol share of fees (raw units, nullable).
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fee_amount_extra
string | null
Extra destination share of fees (raw units, nullable).
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_tracing_id
string
Row-level lineage hash for correlation.
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_parent_tracing_ids
string[]
Parent lineage ids (hex).
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_created_at
string
Record creation time (ISO-8601).
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_updated_at
string
Record last update time (ISO-8601).

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Subscription Example

# Use wscat to connect and subscribe
wscat -c wss://api.blockdb.io/v1/evm/ \
  -H "Authorization: Bearer $BLOCKDB_API_KEY" \
  -x '{"action": "subscribe", "dataset_id": "0303", "chain_id": 1, "params": {"token_in_addresses": ["c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"]}}'

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Response Example

{
  "chain_id": 1,
  "dataset_id": "0303",
  "is_reorg": false,
  "data": {
    "pool_uid": "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640000000000000000000000000",
    "exchange_id": 1,
    "type_id": 201,
    "block_number": 19000042,
    "block_time": "2025-12-20T12:34:56Z",
    "tx_index": 15,
    "log_index": 88,
    "token_in": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "token_out": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "fee_token": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "amount_in": "5.000000000000000000",
    "amount_out": "15850.000000000000000000",
    "fee_amount_total": "0.015000000000000000",
    "fee_amount_user": "0.012000000000000000",
    "fee_amount_protocol": "0.003000000000000000",
    "fee_amount_extra": "0.000000000000000000",
    "_tracing_id": "0303c0ffee000000000000000000000000000000000000000000000000000001",
    "_parent_tracing_ids": [
      "0103c0ffee000000000000000000000000000000000000000000000000000001",
      "0204c0ffee000000000000000000000000000000000000000000000000000001"
    ],
    "_created_at": "2025-12-20T12:35:01Z",
    "_updated_at": "2025-12-20T12:35:01Z"
  }
}
Last modified on April 6, 2026