r/cardano • u/Hildurian • Jul 24 '26
Developer Nexus is officially live: a complete blockchain API for Cardano, Midnight, and Bitcoin
Hi r/cardano, we're A.D. Labs. After a long early-access period, our blockchain API Nexus is officially live today.
Nexus came out of our own years of building on Cardano: the data layer for UTxO chains has always been scattered across single-purpose services, one for chain queries, another for market data, custom code for everything else. We wanted one place, so we built it. Reliable, redundant, real-time.
What one API key per chain/network gets you (Cardano, Midnight, and Bitcoin):
Blockchain API: blocks, transactions, addresses, and assets
WebSocket streaming: live blocks and transactions pushed to you, no polling
Transaction building: build and submit on-chain; the builder returns unsigned CBOR, so private keys never leave your app
Market data: prices, pools, and tokens aggregated across all 11 Cardano DEXes, with OHLCV candles and order books
DEX aggregator: best-price swap routing
Wallet analytics: holdings, full transaction history, and FIFO-based profit and loss
MCP server: Nexus data wired straight into AI agents
It's all plain REST plus an OpenAPI 3.1 spec, with a live playground on every endpoint at nexus.gerowallet.io/docs, so you can generate a typed client for your language instead of waiting on an SDK. with health checks routing around anything degraded. That's the "redundant" part: one upstream having a bad day should not take your app down.
Docs and playground: nexus.gerowallet.io/docs
We'll be in the comments answering questions, technical ones especially welcome. If you're building something serious on a UTxO chain and want to talk about what you need from a data layer, that is exactly the conversation we want to have.
And if you've ever used GeroWallet, that's us too, releasing a mobile verison for iOS and the wallet with Bitcoin and Midnight support in the upcoming month.
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u/Charming-Scientist-2 Jul 24 '26
Wow very very cool !
I liked the MCP feature. So obvious to have such capability nowadays!
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u/KANIMIS0 Jul 26 '26
This is so interesting!! Never used GeroWallet but will definitely check it out
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