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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 chain. See the Chain enumeration for supported values.
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base_token_address
string
required
ERC-20 contract address for the base asset (hex string, 20 bytes, no 0x prefix).
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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
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data.type_id
number
INTEGER
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data.bucket_start
string
TIMESTAMPTZ — Inclusive UTC bucket start.
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data.bucket_end
string
TIMESTAMPTZ — Exclusive UTC bucket end (bucket_start + bucket_seconds).
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data.bucket_seconds
number
INTEGER
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data.token_in
string
BYTEA
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data.token_out
string
BYTEA
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data.price_vwap
string | null
NUMERIC(78,18) — VWAP (token_out per 1 token_in); null if undefined.
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data.total_volume_in_raw
string
NUMERIC(78,0) — Sum of raw UInt256 amountIn values.
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data.total_volume_in
string | null
NUMERIC(78,18) — Decimal-adjusted token_in volume; null if decimals unknown.
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data.total_volume_out_raw
string
NUMERIC(78,0) — Sum of raw UInt256 amountOut values.
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data.total_volume_out
string | null
NUMERIC(78,18) — Decimal-adjusted token_out volume; null if decimals unknown.
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data.trade_count
number
BIGINT
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data._tracing_id
string
BYTEA
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data._parent_tracing_ids
string[] | null
BYTEA[] — Optional parent lineage references.
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data._created_at
string
TIMESTAMPTZ
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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,
    "bucket_start": "2025-11-11T18:00:00.000Z",
    "bucket_end": "2025-11-11T19:00:00.000Z",
    "bucket_seconds": 3600,
    "token_in": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "token_out": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "price_vwap": "3024.112233445566778899",
    "total_volume_in_raw": "580000000000000000000",
    "total_volume_in": "580.000000000000000000",
    "total_volume_out_raw": "1750000000000",
    "total_volume_out": "1750000.000000000000000000",
    "trade_count": 142,
    "_tracing_id": "0405000000000000000000000000000000000001",
    "_parent_tracing_ids": null,
    "_created_at": "2025-11-11T19:00:05.000Z",
    "_updated_at": "2025-11-11T19:00:05.000Z"
  }
}
Messages
subscribe
type:object
unsubscribe
type:object
subscribe_response
type:object
unsubscribe_response
type:object
update
type:object
Last modified on May 27, 2026