--- title: "Blocksize on API3 – A Crypto Data Provider" description: "Blocksize is a first-party data provider on the API3 Network, delivering real-time crypto market data directly on-chain with no middleman in between." canonical_url: "https://blocksize.info/node-ops/oracles/api3/" last_updated: "2026-06-24" --- Source: https://blocksize.info/node-ops/oracles/api3/ API3 · First-party provider # Blocksize on API3 Crypto prices from 9,000+ pairs across 70+ exchanges, tested against API3's consensus with every update. - **9,000+**pairs - **99.99%**node uptime Blocksize feed … BTC/USD … [Announced by API3**API3 blog, 2024 ↗**](https://blog.api3.org/blocksize-joins-api3s-network-of-first-party-oracle-node-providers/) What we run on API3 - Airnode - Signed beacons API3 at a glance · from today's FAQ The network ### What is the API3 Network? API3 is a first-party oracle network. Instead of relying on third-party node operators to fetch and relay data, API3 has the data providers themselves deliver their data on-chain directly. This removes the middleman layer between the source and the blockchain, so applications get data straight from the firms that actually produce it, across 100+ data feeds on every major chain. *hover to read* Its model ### Why first-party data matters Every layer between the source and the chain is a place where data can break, lag, or be tampered with. API3's first-party model removes that layer: the provider runs the connection itself, so the data on-chain comes directly and accountably from its origin. The trade-off is that the network is only as good as the providers behind it, which is exactly why the quality of each source matters. *hover to read* Our role ### Blocksize on API3 Blocksize is a data provider on the API3 Network. We deliver our own aggregated, real-time crypto market data directly into API3, the same feed we provide to our customers off-chain. As a first-party source, our data reaches the chain straight from us, with no intermediary that could distort it on the way. *hover to read* Network participation API3 First-party provider - 01Created - 02Pushed - 03Checked - 04Secured - 05Recognised **0**/5 checked 01 Created ## Built from the whole market. - **Real-time aggregation**Liquidity is scattered. Prices are aggregated between 70+ exchanges live. - **Outlier detection**Individual trades are filtered using confidence intervals. - **Dynamic source**Markets that show sustained drift, staleness, or unreliable volume are dynamically excluded. - **Contingency logic**We have clearly defined rules in place to address rare situations where data is delayed or missing. - **Governance by design**All methodology rules are overseen by the Blocksize Data Committee. 02 Pushed ## Our node, our endpoints. Blocksize Airnode → signed beacon → dAPI median on-chain. 03 Checked · Beacon median ## Tested by consensus, every update. Our signed beacon is one of the sources of the feed; the contract takes the median of the beacons. Our accuracy is not a claim we make. API3 measures it each time we submit. 04 Secured ## Every minute, on the record. Node uptime 99.99% per network. The status page lists each downtime minute instead of a badge. [**99.99%**node uptime*Node status, every network →*](https://blocksize.info/node-operations/performance/) 05 Recognised ## In API3's own words. API3 announced Blocksize on its own channel. The source is one click away. API3 blog · 25 September 2024**“API3 is proud to announce its partnership with BLOCKSIZE”***open the source ↗*Announced by API3 4 layers, trade to chain ## From a trade on 70+ exchanges to API3's consensus. 01 · Exchanges Trades and quotes from 70+ venues. Liquidity is scattered; no venue alone is the market. 02 · Aggregation 9,000+ pairs, outliers filtered, drifting venues down-weighted, rules under the Data Committee. 03 · Airnode We run the connection to the chain ourselves. 04 · Beacon median Our signed beacon is one source of the feed's median. Why it matters to API3 ## What vertical integration gives a network. Accuracy ### No hand-offs between trade and chain The price leaves our aggregation and reaches the network through our own nodes. Nothing in between can round, delay or replace it. Tested in public ### Every update meets consensus Each submission is compared with the other sources before it counts. Our accuracy is measured by the network, update after update, not by us. Security ### Fewer parties in the path Own publisher nodes, own RPC endpoints, own keys. A shorter path has fewer places to attack and fewer parties to trust. Liveness ### One team watches every layer Exchange outages are absorbed in aggregation; node and RPC failover is ours. The status log shows every minute. Accountability ### One name on every layer If a value is wrong, it is ours at every step, and networks penalise bad data. Incentives point one way. Diversity ### An independent operator A first-party source with its own aggregation and infrastructure adds an independent voice to each network's consensus. The same feed, eight networks [**Chainlink**Node operator and data provider](https://blocksize.info/node-ops/oracles/chainlink/) [**Pyth**Publisher](https://blocksize.info/node-ops/oracles/pyth/) [**RedStone**Node operator](https://blocksize.info/node-ops/oracles/redstone/) [**Band**Validator and data operator](https://blocksize.info/node-ops/oracles/band/) [**Supra**Data provider and validator](https://blocksize.info/node-ops/oracles/supra/) [**API3**you are here](https://blocksize.info/node-ops/oracles/api3/) [**Tellor**Reporter and validator](https://blocksize.info/node-ops/oracles/tellor/) [**SEDA**Data provider](https://blocksize.info/node-ops/oracles/seda/) Behind API3 ## Frequently Asked Questions ### Why do oracle-aligned prices matter for our operations? If any part of your portfolio touches DeFi, on-chain derivatives or lending protocols, the prices behind those positions are set by oracle consensus. Liquidations, settlements and margin calls on-chain follow the oracle price, whatever one exchange shows. Blocksize delivers those oracle-grade prices off-chain into your systems, so your risk models match what smart contracts act on. Download our [Whitepaper](https://blocksize.info/market-data/whitepaper/) to learn more. ![Group 36(2)](https://blocksize.info/files/c9417b59-f425-42de-a5b6-9cfcbd1a5746/Group%2036(2).svg) ### What makes Blocksize different from other institutional providers? Our feeds are validated across eight leading oracle networks, which together secure around 75% of all value secured by oracles, and delivered off-chain to institutional systems. Compliance, risk and trading teams receive the same oracle-grade prices that govern DeFi smart contracts. ![Group 36(1)](https://blocksize.info/files/8a7100e7-524d-4675-ad73-db96894343ff/Group%2036(1).svg) ### How is your data different from CoinGecko or CoinMarketCap? A single exchange only shows its own order book, which can drift from the real market: on even the most liquid pair, only about 25% of a top exchange's quotes sit within the true multi-venue fair value, and during stress a venue can diverge by 10 basis points or more. Listing sites like CoinGecko show a reference average, not a real-time, validated feed you can build on. We aggregate across 70+ venues in real time, filter outliers, and down-weight drifting sources, so you get the consensus price the whole market agrees on, not one venue's version of it. ![Building Illustration](https://blocksize.info/files/d26adfc4-a548-4c0c-988c-69db957628cd/building_illustration.png) ### How is your data quality validated? As a first-party oracle data publisher, every price update we produce is independently verified by multiple node operators across decentralized oracle networks like Chainlink, Pyth, and RedStone. Submissions that deviate from consensus are rejected, and operators providing inaccurate data face financial penalties. This creates continuous, real-time quality enforcement in every single block. ![Computer Illustration](https://blocksize.info/files/8a93e958-8c9b-4246-af5d-b03e6603bf85/computer_illustration.png) ### How is Blocksize regulated? Blocksize operates under German jurisdiction with full transparency and a strong focus on institutional-grade compliance. We follow regulatory best practices to meet the expectations of banks, asset managers, and professional investors, delivering secure, non-custodial services with clear legal alignment. ![Building Illustration](https://blocksize.info/files/d26adfc4-a548-4c0c-988c-69db957628cd/building_illustration.png) ![Group 36(2)](https://blocksize.info/files/c9417b59-f425-42de-a5b6-9cfcbd1a5746/Group%2036(2).svg) ![Group 36(1)](https://blocksize.info/files/8a7100e7-524d-4675-ad73-db96894343ff/Group%2036(1).svg) ![Building Illustration](https://blocksize.info/files/d26adfc4-a548-4c0c-988c-69db957628cd/building_illustration.png) ![Computer Illustration](https://blocksize.info/files/8a93e958-8c9b-4246-af5d-b03e6603bf85/computer_illustration.png) ![Building Illustration](https://blocksize.info/files/d26adfc4-a548-4c0c-988c-69db957628cd/building_illustration.png) For API3 teams ## Add Blocksize as a source. [Talk to us](https://blocksize.info/contact/) [Methodology](https://blocksize.info/market-data/methodology/real-time-vwap/)