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WSS
wss://stream.blockdb.io/v1/evm/
Messages
subscribe
type:object
unsubscribe
type:object
subscribe_response
type:object
unsubscribe_response
type:object
update
type:object

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Description

The Spot Prints stream delivers real-time notifications of executed swap events. These prints represent realized execution outcomes, providing the actual prices and sizes achieved on-chain as they happen.

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Subscription Parameters

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chain_id
number
required
Target EVM network.
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base_token_address
string
required
ERC-20 contract address for the base asset.
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quote_token_address
string
required
ERC-20 contract address for the quote asset.

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Message Fields

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exec_price
string
Realized execution price (quote per 1 base).
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amount_in
string
Amount of the input token executed.
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amount_out
string
Amount of the output token received.
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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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block_number
number
Block height where the swap occurred.
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_tracing_id
string
Row-level lineage hash for correlation.

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Subscription Example

# Use wscat to connect and subscribe
wscat -c wss://stream.blockdb.io/v1/evm/ \
  -H "Authorization: Bearer $BLOCKDB_API_KEY" \
  -x '{"action": "subscribe", "dataset_id": "0302", "chain_id": 1, "params": {"base_token_address": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", "quote_token_address": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"}}'

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Response Example

{
  "chain_id": 1,
  "dataset_id": "0302",
  "is_reorg": false,
  "data": {
    "base_token_address": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "quote_token_address": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "pool_uid": "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640000000000000000000000000",
    "token_in": "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "token_out": "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
    "amount_in": "10.000000000000000000",
    "amount_out": "30241.122334455667788990",
    "exec_price": "3024.112233445566778899",
    "block_number": 18930123,
    "block_time": "2025-11-11T18:15:30Z",
    "_tracing_id": "0302000000000000000000000000000000000001",
    "_created_at": "2025-11-11T18:15:35.000Z"
  }
}