BlockSize Data Parser & API

BlockSize is a Frankfurt-based institutional crypto market-data provider that aggregates real-time price feeds and VWAP reference rates across 9,000+ assets from 70+ centralized and decentralized exchanges, and StockAPIS extracts its data — aggregated prices, 30-minute and daily VWAP benchmarks, and source-exchange breakdowns — through a single REST API. BlockSize offers an official API (BlockSize Connect, with REST and WebSocket delivery), and StockAPIS normalizes it to the same schema you use for every other crypto source, so you query BlockSize, Kaiko and CF Benchmarks the same way without maintaining separate integrations.

Platform Overview

Market Position

• An institutional, oracle-grade crypto data vendor built for accuracy-critical use cases
• Aggregates 9,000+ assets across 70+ centralized exchanges and DEXs into single reference prices
• Price feeds engineered to meet decentralized oracle accuracy standards (consensus-enforced data quality)
• Official BlockSize Connect API with REST and WebSocket delivery, complemented by StockAPIS’s unified normalization

Data Coverage

StockAPIS exposes the full BlockSize reference-data surface:

• Aggregated price feeds — real-time consolidated prices benchmarked across all supported venues to avoid one-sided market inaccuracies
• 30-minute VWAP — market reference closing prices calculated as a volume-weighted average across exchanges within each 30-minute interval
• Daily VWAP — a single volume-adjusted price point per asset over a trailing 24 hours, updated at 00:00:00 UTC
• Source-exchange breakdown — which venues and volumes contributed to each aggregated rate
• Reference rates — benchmark-grade pricing suitable for settlement, NAV and oracle feeds
• Coverage metadata — supported assets, contributing exchanges and feed timestamps

Quick Start

import stockapis
 
client = stockapis.Client(api_key="your-api-key")
 
# Aggregated reference price for an asset
btc = client.blocksize.get_reference_rate(symbol="BTC-USD")
print(f"BTC VWAP: ${btc['vwap']}  ·  daily VWAP ${btc['dailyVwap']}")

const { StockAPIS } = require("stockapis");
const client = new StockAPIS({ apiKey: "your-api-key" });
 
// Daily VWAP benchmark with contributing exchanges
const rate = await client.blocksize.getReferenceRate({ symbol: "ETH-USD" });
console.log(rate.dailyVwap, rate.sourceExchanges);

Sample API Response

{
  "success": true,
  "data": {
    "symbol": "BTC-USD",
    "price": "45012.40",
    "vwap": "44998.75",
    "dailyVwap": "44650.10",
    "volume": "18420.5",
    "referenceRate": "44998.75",
    "sourceExchanges": [
      { "exchange": "binance", "weight": 0.41 },
      { "exchange": "coinbase", "weight": 0.27 },
      { "exchange": "kraken", "weight": 0.18 },
      { "exchange": "okx", "weight": 0.14 }
    ],
    "interval": "30m",
    "timestamp": "2024-01-15T10:30:00.000Z"
  },
  "metadata": { "source": "blocksize", "timestamp": "2024-01-15T10:30:00.000Z" }
}

Use Cases

• Settlement & NAV pricing — use benchmark-grade VWAP reference rates to mark portfolios and settle contracts
• Oracle feeds — feed consensus-grade aggregated prices into on-chain oracles and DeFi protocols
• Cross-venue fair value — derive a single fair price from 70+ exchanges instead of trusting one venue’s tick
• Quant research & backtesting — anchor models on volume-weighted reference series across the full asset universe

Frequently Asked Questions

Does BlockSize have an official API? Yes — BlockSize provides the BlockSize Connect API with REST and WebSocket delivery for real-time and aggregated price feeds. StockAPIS wraps it in a unified schema so BlockSize data matches every other source you pull.

What data can I get from BlockSize through StockAPIS? Aggregated real-time prices, 30-minute and daily VWAP reference rates, source-exchange weightings and coverage metadata across 9,000+ assets from 70+ exchanges and DEXs.

How is BlockSize different from a single exchange feed? BlockSize aggregates and volume-weights prices across many venues to produce a single benchmark reference rate, reducing the impact of any one exchange’s outliers or thin liquidity — built to oracle-grade accuracy standards.

Related Resources

• API reference
• Crypto data sources