Skip to main content
WSS
Messages
subscribe
type:object
unsubscribe
type:object
subscribe_response
type:object
unsubscribe_response
type:object
update
type:object

​
Overview

​
Subscription Parameters

​
chain_id
number
required
Target EVM network. 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_currency_code
string
required
ISO-4217 fiat currency code (e.g., USD, EUR).

​
Message Fields (data)

Top-level fields: chain_id, dataset_id, is_reorg, data (object). The data object mirrors b0605_token_to_fiat_vwap:
​
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_address
string
BYTEA
​
data.price_usd
string
NUMERIC(78,18)
​
data.total_notional_usd
string
NUMERIC(78,18)
​
data.hops
number
INTEGER
​
data.sources_count
number
INTEGER
​
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

​
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": "0605", "chain_id": 1, "params": {"base_token_address": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", "quote_currency_code": "USD"}}'

​
Response Example

{
  "chain_id": 1,
  "dataset_id": "0605",
  "is_reorg": false,
  "data": {
    "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_address": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "price_usd": "3024.112233445566778899",
    "total_notional_usd": "1750000.000000000000000000",
    "hops": 2,
    "sources_count": 4,
    "_tracing_id": "0605000000000000000000000000000000000001",
    "_created_at": "2025-11-11T19:00:05.000Z",
    "_updated_at": "2025-11-11T19:00:05.000Z"
  }
}
Last modified on April 6, 2026