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Making Digital Assets Bankable
Every asset on-chain deserves the right price.
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We make sure it gets one, delivering that accuracy to everyone building, trading, and valuing crypto.
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Blocksize is a market data provider for crypto and tokenized assets. We aggregate prices from more than 70 exchanges in real time, delivered through one API.
BTC/USD · real-time VWAP · …
Our clients and partners
Who Is Blocksize
We operate across the oracle value chain. Making DeFi more secure and accessible.
We operate publishers in all leading oracle networks, run the node infrastructure that delivers data on-chain, and aggregate the crypto market data that mission-critical use cases depend on, from DeFi protocols to financial institutions.
Publishers in all leading oracle networks
The node infrastructure that delivers data on-chain
- Publishers
- Nodes
- RPC endpoints
Real-Time Market Data
Best-in-class market data, taken from the source: VWAP from executed trades, consolidated bid/ask from top-of-book updates, state prices read directly from pool contracts. Aggregated in real time across 70+ exchanges and 9,000+ pairs, plus 40 tokenized assets priced 24/7, outliers filtered, delivered over WebSocket at sub-250 ms latency. Built for the highest standards of decentralized oracle networks, developers, and financial institutions.
Consensus Proven
Blocksize operates the infrastructure behind the data: publishers, nodes and RPC endpoints across the leading oracle networks. Every price we submit must hold against consensus before it is accepted on-chain: independent validation, continuously, across networks securing around 75% of all value secured by oracles. A first-party data publisher since 2018, into eight networks. The same feed that is checked on-chain is the one delivered off-chain, through one API.
Solutions
One Price. Four Teams.
The same live price, in what each team does with it.
LIVE
- BTC/USD REAL-TIME VWAP
One Price, Whole Market.
Crypto liquidity is scattered. There is no consolidated tape and no single official price. The same asset trades at different levels on every venue, and the gaps widen exactly when accuracy matters most. Even the deepest exchanges sit within market-wide fair value only 25% of the time. Blocksize aggregates into one price the whole market agrees on.
- Illustration · share of volume
- Venue A21%
- Venue B18%
- Venue C16%
- Venue D13%
- Venue E12%
- Venue F11%
- Venue G9%
- Blocksizeone price
afastbutwrongpriceisjustafastermistake
Verified where it matters most
Our data is published into the leading oracle networks, where every update is checked by consensus before it's trusted on-chain. The same feed that is checked on-chain is the one delivered off-chain.
Outstanding Accuracy
Every price is held inside a tight fair-value accuracy corridor. Bad prints, stale books and drifting venues are detected and down-weighted. Operated from compliant infrastructure in Germany, with 24/7 monitoring, automated failover, and a hands-on engineering team behind it. Reliability and accuracy you can build on.
Network Contribution
We aggregate the market data, operate the publishing infrastructure that delivers it on-chain, and stay active in the networks: running RPC nodes where needed, self-staking our own funds, voting in governance, and contributing open-source tooling. Our long-term commitment strengthens the ecosystems we believe in.
Made in Germany
Blocksize is incorporated in Germany — operating under strict legal frameworks with full transparency and accountability. We operate highly reliable infrastructure, giving our partners confidence in every transaction.
Resources
Learn more.
The three newest articles from the Blocksize blog, newest first.
Getting Started with Blocksize Market Data
Everything you need before you integrate: what we cover across exchanges and asset classes, which data products are included at each tier, how the feed is delivered and documented, what it costs, and who relies on it.
We operate the infrastructure behind the data: publishers, nodes and RPC endpoints across eight leading oracle networks. Our prices have to hold against consensus on-chain, validated continuously by parties with no incentive to agree with us. Most market data vendors publish a number and ask you to trust it; ours is checked by independent operators every time it goes on-chain, across networks securing around 75% of all value secured by oracles.
Asset managers and funds use Blocksize for NAV and fair-value marks their auditors sign off. Trading firms and brokers use it for best-execution benchmarks and backtesting against clean history aggregated across all venues. Crypto businesses, exchanges, custodians and lenders use it for pricing, collateral and risk. Oracle networks and DeFi protocols use Blocksize as a first-party data publisher, as they have since 2018.
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More than 70 centralized and decentralized exchanges, and over 9,000 crypto price pairs, aggregated and updated in real time. Coverage spans majors like BTC, ETH and SOL through to long-tail and low-liquidity pairs, where single-venue pricing breaks down most severely. RWA feeds add 38 tokenized stocks, gold and silver, priced 24/7 through the same API.
Real-Time VWAP, Real-Time Bid/Ask, 24-Hour VWAP and 30-Minute VWAP are included on every plan. AMM State Price and tick-level trade Events are available from Business upwards. Each is drawn from its own source: VWAP from executed trades, bid/ask from top-of-book updates, state prices read directly from pool contracts. The 24-hour and 30-minute VWAP windows are built for closing marks, end-of-day valuation and audit-ready reporting. RWA bid/ask feeds price 38 tokenized stocks, gold and silver around the clock. RWA perpetuals are coming soon.
Data is delivered over WebSocket at sub-250ms latency, with HTTP available on Enterprise plans. The API documentation covers authentication, subscription methods, message schemas and error handling, with a machine-readable spec at api-docs.json. AI agents can connect through our MCP server without writing integration code.
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Pricing is published: Developer at €49, Start-Up at €299 and Business at €799 per month, with Enterprise quoted individually. Tiers differ by active feed count, API keys, concurrent connections, licence type and support level. Data quality is identical across all of them. See all plans and limits →
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Yes. 14 days free. Create an API key in the data portal and you can be streaming live data within minutes. The trial gives you the real feed, not a sandbox or delayed sample, so you can benchmark it against whatever you're using today.
Free trial
Test the Feeds on Live Data.
Every plan starts with a 14-day trial on live data.
- 01 Sign up
- 02 Get your key
- 03 Subscribe
ws.subscribe("BTCUSD", "realtime_vwap")