Yields

# 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": "0411", "chain_id": 1, "params": {"target_period_days": 7}}'

#include <libwebsockets.h>
#include <string.h>
#include <stdio.h>

static int callback_blockdb(struct lws *wsi, enum lws_callback_reasons reason,
                            void *user, void *in, size_t len) {
    switch (reason) {
        case LWS_CALLBACK_CLIENT_ESTABLISHED:
            lws_callback_on_writable(wsi);
            break;
        case LWS_CALLBACK_CLIENT_RECEIVE:
            printf("Received: %s\n", (char *)in);
            break;
        case LWS_CALLBACK_CLIENT_WRITEABLE: {
            unsigned char buf[LWS_PRE + 512];
            unsigned char *p = &buf[LWS_PRE];
            size_t n = sprintf((char *)p, "{\"action\": \"subscribe\", \"dataset_id\": \"0411\", \"chain_id\": 1, \"params\": {\"target_period_days\": 7}}");
            lws_write(wsi, p, n, LWS_WRITE_TEXT);
            break;
        }
    }
    return 0;
}

using System;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

class Program {
    static async Task Main() {
        using var ws = new ClientWebSocket();
        ws.Options.SetRequestHeader("Authorization", $"Bearer {Environment.GetEnvironmentVariable("BLOCKDB_API_KEY")}");
        await ws.ConnectAsync(new Uri("wss://api.blockdb.io/v1/evm/"), CancellationToken.None);

        var subMsg = "{\"action\": \"subscribe\", \"dataset_id\": \"0411\", \"chain_id\": 1, \"params\": {\"target_period_days\": 7}}";
        await ws.SendAsync(new ArraySegment<byte>(Encoding.UTF8.GetBytes(subMsg)), WebSocketMessageType.Text, true, CancellationToken.None);

        var buffer = new byte[1024 * 4];
        while (ws.State == WebSocketState.Open) {
            var result = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            Console.WriteLine(Encoding.UTF8.GetString(buffer, 0, result.Count));
        }
    }
}

import websocket
import json
import os

def on_message(ws, message):
    print(f"Received: {message}")

def on_open(ws):
    msg = {
        "action": "subscribe",
        "dataset_id": "0411",
        "chain_id": 1,
        "params": {
            "target_period_days": 7
        }
    }
    ws.send(json.dumps(msg))

ws = websocket.WebSocketApp(
    "wss://api.blockdb.io/v1/evm/",
    header={"Authorization": f"Bearer {os.getenv('BLOCKDB_API_KEY')}"},
    on_message=on_message,
    on_open=on_open
)
ws.run_forever()

const WebSocket = require('ws');

const ws = new WebSocket('wss://api.blockdb.io/v1/evm/', {
  headers: { 'Authorization': `Bearer ${process.env.BLOCKDB_API_KEY}` }
});

ws.on('open', () => {
  ws.send(JSON.stringify({
    action: 'subscribe',
    dataset_id: '0411',
    chain_id: 1,
    params: {
      target_period_days: 7
    }
  }));
});

ws.on('message', (data) => {
  console.log('Received:', JSON.parse(data));
});

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"github.com/gorilla/websocket"
)

func main() {
	header := http.Header{"Authorization": []string{"Bearer " + os.Getenv("BLOCKDB_API_KEY")}}
	c, _, err := websocket.DefaultDialer.Dial("wss://api.blockdb.io/v1/evm/", header)
	if err != nil {
		log.Fatal("dial:", err)
	}
	defer c.Close()

	sub := `{"action": "subscribe", "dataset_id": "0411", "chain_id": 1, "params": {"target_period_days": 7}}`
	err = c.WriteMessage(websocket.TextMessage, []byte(sub))
	if err != nil {
		log.Fatal("write:", err)
	}

	for {
		_, message, err := c.ReadMessage()
		if err != nil {
			log.Fatal("read:", err)
		}
		fmt.Printf("Received: %s\n", message)
	}
}

{
  "chain_id": 1,
  "dataset_id": "0411",
  "is_reorg": false,
  "data": {
    "pool_uid": "00000000000000000000000088e6a0c2ddd26feeb64f039a2c41296fcb3f5640",
    "exchange_id": 3,
    "type_id": 302,
    "block_number": 19001234,
    "block_time": "2025-12-20T12:34:56Z",
    "tx_index": 7,
    "log_index": 12,
    "target_period_days": 30,
    "observed_period_days": 30,
    "is_full_period": true,
    "is_extrapolated": false,
    "extrapolation_factor": "1.000000",
    "window_start_time": "2025-11-20T12:34:56Z",
    "window_end_time": "2025-12-20T12:34:56Z",
    "tokens": [
      "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"
    ],
    "current_reserves": [
      "1250.000000000000000000",
      "3950000.000000000000000000"
    ],
    "volume_observed": [
      "12000.000000000000000000",
      "0.000000000000000000"
    ],
    "volume_predicted": [
      "12000.000000000000000000",
      "0.000000000000000000"
    ],
    "user_fees_observed": [
      "36.000000000000000000",
      "0.000000000000000000"
    ],
    "user_fees_predicted": [
      "36.000000000000000000",
      "0.000000000000000000"
    ],
    "roi_predicted": [
      "0.028800000000000000",
      "0.000000000000000000"
    ],
    "_tracing_id": "041100000000000000000000000000007401",
    "_parent_tracing_ids": ["030300000000000000000000000000007401", "030100000000000000000000000000007401"],
    "_created_at": "2025-12-20T12:35:01Z",
    "_updated_at": "2025-12-20T12:35:01Z"
  }
}