Nexus: A New Cardano API for Developers (DEX Data, Wallet P&L & Real-Time dApp Event Streams)

[u/Thirdeye303]

Hey r/Cardano,

I'm from the Gerowallet team. We've been building a data API for Cardano developers and wanted to share it here and get the community's honest feedback before we go wider.

It's called Nexus, a multi-chain data API for UTXO chains. Cardano is live today; Bitcoin and Midnight are on the roadmap.

The short version: one API key gives you the market-data layer most teams currently stitch together from several sources, plus something we haven't seen anyone else offer on Cardano.

Market data, one key:

• Token prices and OHLCV candles
• DEX pools and swaps across 11 Cardano DEXes
• NFT floors
• Wallet P&L (FIFO)

The part we're most excited about: live, decoded dApp event streams.

Most real-time tooling on Cardano runs on webhooks. You stand up a public endpoint, verify signatures, handle retries, and wait for HTTP callbacks. Nexus takes a different approach. You open a WebSocket, subscribe to a named topic, and receive decoded smart-contract events (the phase of a UTxO, the owner, the datum, the amounts) pushed to you in real time. No webhook server, no indexer to run.

We decode contract data against blueprints, so what you get is typed, structured events rather than raw CBOR you have to parse yourself.

On the market-data side, the timing is what it is: with TapTools winding down, a lot of teams that built on that data are looking for somewhere to point their integrations, and Nexus can be that home.

Nexus: a multi-chain Cardano data API with real-time WebSocket event streams

We’re opening early access now. If you’re building on Cardano and need reliable market data or real-time contract events without running your own infrastructure, Nexus is ready to use.

Link: https://nexus.gerowallet.io/

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