For developers evaluating alternatives after the Maestro shutdown, Nexus supports Cardano and Bitcoin APIs

[u/Hildurian]

With Maestro retiring its Developer API on September 18, a lot of teams in the ecosystem are going to be reviewing their infrastructure over the coming weeks.

For anyone comparing providers, Nexus is an API platform providing infrastructure for Cardano and Bitcoin through the same service.

On the Bitcoin side, Nexus currently covers:

• Blocks
• Transactions
• Addresses
• UTXOs
• Mempool data
• Fee estimates
• Transaction broadcasting
• Ordinals
• Runes

The API is REST based, includes an OpenAPI specification, and we provide a TypeScript SDK.

Nexus:
https://nexus.gerowallet.io/

Docs:
https://nexus.gerowallet.io/docs/introduction

I’m part of the team behind Nexus.

Given the Maestro shutdown, we’re particularly interested in hearing from developers who depend on specific Maestro workflows today. If there are endpoints, data structures, or developer tooling that are especially important to your stack, I’d be happy to discuss them.

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[u/quantum3ntanglement]

What is Nexus doing? Is it downloading the entire BTC and ADA chains to a local drive?

Can run I run queries on them? For tax purposes I need to be able to query these chains.

[u/Hildurian → u/quantum3ntanglement]

Yes you can query these chains using Nexus - it does not download the entire chain to your drive though.

with a nexus api key you can look for your wallet address and pull all the information our nodes have on that address for example, all the transactions, what was transacted to whom, when, even P&L

Given your use case is not a developer use-case, do you frequently need to query these chains? because if not - it will be a waste of your money and there are other, cheaper tools for that

shoot me a DM if you would like to talk further though, i'll gladly help if I can

[u/quantum3ntanglement → u/Hildurian]

I am a developer and I also need to do complex tax calculations, I want to be able to do this in private and not on the web. Is my privacy being protected using the Nexus API?

I've looked into downloading entire chains but it gets complicated when doing that, I'm currently working with Daedalus developers on syncing the ADA chain, they are using a snapshot feature and I'm going to reseach the code for the project.

Is there a free tier for a Nexus API Key? If so how much do I get, I might take it for spin to test things out.

[u/Hildurian → u/quantum3ntanglement]

No hosted API gives you the privacy you're describing. The address goes in the URL, so it hits the server. That's Nexus, Blockfrost, Koios, all of them. A local node is the only thing that solves it, so you're on the right track there.

What we do on our side: no keys, no seed phrases, no custody. Usage metering is aggregated by endpoint type rather than URL, so no addresses are stored against your account. Detailed request logs are capped at 90 days then dropped. Policy is at nexus.gerowallet.io/privacy. The calculation never touches us anyway, pull the data and run it locally.

Worth knowing where the node stops though. It gives you every transaction and UTXO, which is the easy half. It gives you nothing on ADA/USD at the time of each transaction, and cost basis is where the real work is. You'll need price data from somewhere regardless, and prices don't require sending an address anywhere.

No free tier. Builder is $29/mo with a 7 day free trial, card on file, first charge on day 7, cancel before then and you pay nothing. 2M requests a month, 25 req/s, 3 keys. Historical prices and candles are a $19/mo addon.

Ask if you want specifics on the endpoints.

[u/quantum3ntanglement → u/Hildurian]

Please provide details on the specific endpoints

I need to calculate Fair Market Value for a mined token so I need the price for that day, every time I receive a mined reward I have to calculate this

I need historical pricing data for an entire year and I don't want to expose my addresses, so a $19 a month add on is the only option for this and I have to pay the base $29/mo?