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WSS

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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.
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pool_uids
string[]
Filter updates to specific BlockDB pool identifiers.
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exchange_ids
number[]
Filter updates by exchange identifiers. See the DigitalExchange enumeration.

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Message Fields

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pool_uid
string
BlockDB pool identifier.
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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 fee-terms record is anchored.
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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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total_fee
string | null
Total fee fraction (e.g., 0.003 = 0.30%). String to preserve NUMERIC(18,18) precision.
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user_fee
string | null
Absolute fee fraction allocated to LPs/users (same units as total_fee).
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protocol_fee
string | null
Absolute fee fraction allocated to protocol/treasury (same units as total_fee).
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extra_fee
string | null
Absolute fee fraction allocated to extra destinations (same units as total_fee).
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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": "0212", "chain_id": 1, "params": {"pool_uids": ["88e6a0c2ddd26feeb64f039a2c41296fcb3f5640000000000000000000000000"]}}'

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Response Example

{
  "chain_id": 1,
  "dataset_id": "0212",
  "is_reorg": false,
  "data": {
    "pool_uid": "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640000000000000000000000000",
    "exchange_id": 1,
    "type_id": 201,
    "block_number": 19001234,
    "block_time": "2025-12-20T12:34:56Z",
    "tx_index": 7,
    "log_index": 12,
    "total_fee": "0.003000000000000000",
    "user_fee": "0.003000000000000000",
    "protocol_fee": "0.000000000000000000",
    "extra_fee": "0.000000000000000000",
    "_tracing_id": "0212c0ffee000000000000000000000000000000000000000000000000000001",
    "_parent_tracing_ids": [
      "0103c0ffee000000000000000000000000000000000000000000000000000001"
    ],
    "_created_at": "2025-12-20T12:35:01Z",
    "_updated_at": "2025-12-20T12:35:01Z"
  }
}
Messages
subscribe
type:object
unsubscribe
type:object
subscribe_response
type:object
unsubscribe_response
type:object
update
type:object
Last modified on April 6, 2026