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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 chain. See the Chain enumeration for supported values.
​
base_token_address
string
required
ERC-20 contract address for the base asset (hex string, 20 bytes, no 0x prefix).
​
quote_token_address
string
required
ERC-20 contract address for the quote asset (hex string, 20 bytes, no 0x prefix).

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Message Fields (data)

Top-level fields: chain_id, dataset_id, is_reorg, data (object). The data object mirrors b0405_token_to_token_vwap_v1:
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data.pool_uid
string
BYTEA
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data.exchange_id
number
INTEGER
​
data.type_id
number
INTEGER
​
data.first_block_number
number
BIGINT
​
data.first_block_time
string
TIMESTAMPTZ
​
data.first_tx_index
number
INTEGER
​
data.first_log_index
number
INTEGER
​
data.last_block_number
number
BIGINT
​
data.last_block_time
string
TIMESTAMPTZ
​
data.last_tx_index
number
INTEGER
​
data.last_log_index
number
INTEGER
​
data.bucket_start
string
TIMESTAMPTZ
​
data.bucket_seconds
number
INTEGER
​
data.token_in
string
BYTEA
​
data.token_out
string
BYTEA
​
data.price_vwap
string
NUMERIC(78,18)
​
data.total_volume_in
string
NUMERIC(78,18)
​
data.total_volume_out
string
NUMERIC(78,18)
​
data.trade_count
number
BIGINT
​
data._tracing_id
string
BYTEA
​
data._parent_tracing_ids
string[]
BYTEA[] (nullable by default; can be large)
​
data._created_at
string
TIMESTAMPTZ
​
data._updated_at
string
TIMESTAMPTZ

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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": "0405", "chain_id": 1, "params": {"base_token_address": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", "quote_token_address": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"}}'

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Response Example

{
  "chain_id": 1,
  "dataset_id": "0405",
  "is_reorg": false,
  "data": {
    "pool_uid": "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640000000000000000000000000",
    "exchange_id": 1,
    "type_id": 201,
    "first_block_number": 18930000,
    "first_block_time": "2025-11-11T18:00:11.000Z",
    "first_tx_index": 12,
    "first_log_index": 5,
    "last_block_number": 18939999,
    "last_block_time": "2025-11-11T18:59:48.000Z",
    "last_tx_index": 44,
    "last_log_index": 2,
    "bucket_start": "2025-11-11T18:00:00.000Z",
    "bucket_seconds": 3600,
    "token_in": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "token_out": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "price_vwap": "3024.112233445566778899",
    "total_volume_in": "580.000000000000000000",
    "total_volume_out": "1750000.000000000000000000",
    "trade_count": 142,
    "_tracing_id": "0405000000000000000000000000000000000001",
    "_created_at": "2025-11-11T19:00:05.000Z",
    "_updated_at": "2025-11-11T19:00:05.000Z"
  }
}
Last modified on April 6, 2026