One API surface.
Chain data, market data and transactions for Cardano, Bitcoin and Midnight, on one surface.
▸ nexus.btc_address_ordinals address: bc1q…8f4z
Six products on one API
One base URL and one auth header across Cardano, Midnight, and Bitcoin. Each API key is scoped to a single chain and network, and market data, wallet analytics, transaction building, and MCP are add-ons, sold alone or in bundles.
Blockchain API
Blocks, txs, addresses & assets
Ten endpoint groups, accounts to governance, plus submit and evaluate.
WebSocket Streaming
Live blocks & txs, pushed to you
Push, not poll: market data on a 10 second cadence, Blueprints with REST backfill.
Transaction Building
Build & submit on-chain
Transfers, staking, and Conway governance built server-side. Unsigned CBOR out; keys never touch Nexus.
DEX Aggregator
Best-price swap routing
Best-price routing across Minswap, WingRiders, Splash, and SaturnSwap. You sign every swap.
MCP Server
Nexus data for AI agents
A hosted MCP endpoint: AI agents query Cardano, Bitcoin, and Midnight with your own key.
Prices, candles, pools, order books, and NFT sales across all 11 indexed DEXes.
Three chains, one account
Each API key is scoped to one chain and one network. Same base URL, same auth header.
Cardano
The deepest surface: chain data, DEX market data, wallet P&L, transaction building, and WebSocket streaming.
Explore the Cardano APIMidnight
Network info, unshielded transaction build and submit, and DUST registration, live on the same account.
Explore the Midnight APIBitcoin
Chain data including ordinals, runes, and mempool, live on the same account.
See Bitcoin endpointsEnterprise-grade Cardano data infrastructure, extended to Bitcoin & Midnight
Provider redundancy, aggressive caching, and a unified API surface across every chain we support. Building on Cardano? See the full Cardano API surface.
One endpoint, several upstreams
Every request is served behind Yaci, Koios, Blockfrost, and our own indexers. Per-provider health checks pick a healthy upstream for each call, so a degraded source is routed around instead of reaching your app.
See live provider statusAggressive Caching
Hot blockchain data is served from cache so repeat queries are fast and your provider quotas last.
Usage analytics
Per-key request counts, allowed versus rejected breakdowns, and usage history in the dashboard.
GERO Token Benefits
Hold GERO tokens for discounts and enhanced API limits.
Comprehensive Data
Access blockchain, DeFi, NFT, and market data through unified APIs.
Non-custodial by design
Nexus never holds private keys: transactions are built unsigned and signed client-side. See the privacy policy for how account and usage data is handled.
One platform for every chain and every capability
Market data, wallet analytics, transactions, and WebSocket streaming. Official TypeScript SDK, plain REST for every other language, OpenAPI 3.1 spec for the rest.
// npm install @adlabs/nexus (official SDK, zero runtime dependencies)
import { NexusClient } from "@adlabs/nexus";
const nexus = new NexusClient({ apiKey: process.env.NEXUS_API_KEY! });
// Cardano chain data
const utxos = await nexus.cardano.addresses.utxos("addr1...");
const pool = await nexus.cardano.pools.byId("pool1...");
// Cardano market data (mainnet)
const prices = await nexus.cardano.market.prices();
// Bitcoin and Midnight, same client
const tip = await nexus.bitcoin.chain.tip();
const info = await nexus.midnight.info.get("undeployed");
// Typed end to end: request + response types are generated
// from the live Nexus OpenAPI spec and ship with the package.Why Choose Nexus?
Official TypeScript SDK
npm install @adlabs/nexus: a typed, zero-dependency client for Cardano chain and market data, Bitcoin, and Midnight. Types are generated from the live OpenAPI spec. MIT, open source on GitHub.
Plain REST, any language
HTTPS + an X-Api-Key header is the whole protocol. Works with the HTTP client built into Node, the JDK, Python, Go, Rust, or your shell. No SDK required.
OpenAPI 3.1 spec included
A full machine-readable spec is published at /v3/api-docs and rendered with a live playground at /docs. Generate a typed client for 50+ languages with one openapi-generator command.
Multi-provider failover
Every request is served behind Yaci, Koios, Blockfrost, and our own indexers, with health checks routing around degraded upstreams. When one goes down, your app keeps serving.
One account, every chain
Each API key is scoped to one chain and one network (Cardano, Bitcoin, and Midnight), all under the same base URL and the same Nexus account. One dashboard, one bill, no separate providers to juggle.
Read the full reference
Every endpoint, parameter, and response shape, with a live playground built into each page.
Built by the GeroWallet team
The platform behind GeroWallet
Nexus is built and run by A.D. Labs LTD, the team behind GeroWallet, the non-custodial Cardano and Midnight wallet. The wallet's market data, swap routing and transaction building run on this API in production, so the endpoints you integrate are the ones we depend on ourselves.
GeroWalletRuns on Nexus in productionSee GeroWallet- Swap routing
GeroWallet's DEX aggregator quotes and builds every swap through the Nexus swap API.
- Market data
The wallet’s Market tab reads prices, candles and order books from the same Nexus feed you get on a Cardano key.
- Transaction building
Transfers and swaps in the wallet are built server-side by the Nexus transaction builder.
Partners, customers, and design partners
Design partner
Open-source partner
Network partner
Integration partner
Community integration partner
Simple, scalable Nexus pricing
Start on the core API for $9, then add a bundle or only the add-ons you need. Live in minutes: upgrade, downgrade, or cancel anytime.
Starter
Prototypes and hobby projects.
- 3,000,000 requests / month
- 10 req/s sustained · burst 100
- 2 API keys
- Full blockchain API
- Preprod + mainnet access
- Core API only, no add-ons
Builder
Indie devs and side projects.
- 10,000,000 requests / month
- 25 req/s sustained · burst 250
- 4 API keys
- Everything in Starter
- Add-ons, bundles, and WebSocket streaming
Growth
Startups and DApp teams.
- 30,000,000 requests / month
- 50 req/s sustained · burst 500
- 7 API keys
- Everything in Builder
Scale
Production applications.
- 50,000,000 requests / month
- 100 req/s sustained · burst 1,000
- 13 API keys
- Everything in Growth
- Priority support
For exchanges, institutional, and regulated teams
Higher volumes, bundled add-ons, and isolated infrastructure with a contractual SLA.
Enterprise
Exchanges, aggregators, and institutional users.
Everything in Scale, plus all add-ons bundled and per-API-key rate limit overrides for mixed workloads.
- 200,000,000 requests / month
- 500 req/s sustained · burst 5,000
- Unlimited API keys
- Market Data, Wallet Analytics, Transaction Builder, MCP Server, and WS Unlimited included
- Per-API-key rate limit overrides
- Email support · 48h response
Dedicated
For compliance, data residency, and custom SLAs.
Your own isolated infrastructure. Negotiated request volumes, rate limits, SLA, and support channels.
- Dedicated GKE cluster + postgres
- Physical data isolation
- Contractual SLA (negotiable)
- Dedicated Slack/Teams · 4h response
- Custom endpoints and filtered streams
- On-premise option available
Bundles and add-ons
Bundle the capabilities you use together and pay less, or add them one at a time. REST add-ons share your tier's unified request pool, one number to track. WebSocket has its own connection and message limits.
Data
$34 separately · save $15
For dashboards, portfolio apps and trading tools.
- Market Data $19
- Wallet Analytics $15
Build + AI
$38 separately · save $19
For wallets, dApps and AI agents that build transactions.
- Transaction Builder $19
- MCP Server $19
Complete
$72 separately · save $43
Data and Build + AI together, for less than both.
- Market Data $19
- Wallet Analytics $15
- Transaction Builder $19
- MCP Server $19
One bundle per plan. IPFS and WebSocket packages are sold separately. The Starter plan covers the core API only.
Market Data
Prices, OHLCV candles, DEX pools, order books, and NFT sales across all 11 Cardano DEXes.
- Prices across all 11 DEXes (Minswap, SundaeSwap, WingRiders, VyFi, Splash, TeddySwap, MuesliSwap, CSwap)
- OHLCV candles: 15m, 1h, 1D, 1W
- DEX pool TVL, reserves, fees
- Order books: AMM-simulated + MuesliSwap, GeniusYield
- NFT marketplace sales (jpg.store V2/V3)
- Token metadata: name, ticker, logo, decimals
Wallet Analytics
Holdings, transaction history, and FIFO-based P&L per wallet.
- Current holdings with USD valuation
- Full send/receive transaction history
- FIFO-based P&L calculation per token
Transaction Builder
Server-side UTXO selection, fee calc, and unsigned CBOR for transfers, staking, and governance.
- UTXO selection, fee calc, change outputs
- ADA + native token transfers
- Staking: pool delegation, key (de)registration
- Governance (Conway): DRep delegation, votes
- Reward withdrawal
MCP Server
Model Context Protocol endpoint: connect Claude and other AI agents directly to Nexus data + tools.
- Hosted Model Context Protocol endpoint
- Connect Claude, Cursor, and other MCP-compatible AI agents
- 25+ tools: Cardano, Bitcoin, Midnight, market data
- Balances, tx info, and unsigned tx building from chat
- Per-API-key authentication
IPFS
Resolve, inspect, and pin IPFS content through Nexus’ self-hosted node: gateway fetch, stat/ls, IPNS resolve, and per-key pinning.
- Self-hosted IPFS node: resolve any reachable CID via the DHT
- Gateway fetch with HTTP range + HEAD support
- Content metadata: stat (size/type) and directory ls
- IPNS name resolution
- Per-API-key pinning (pin / list / unpin), tenant-isolated
WebSocket Streaming
Live market data via STOMP-over-SockJS. Subscribe to price updates, trade events, and pool changes with a 10-second broadcast interval.
Configure Your Plan
Pick a base tier, add a bundle or the add-ons you need, and preview your $GERO staking discount.
Base Tier
Select your plan tier.
Bundles
Add-ons that work together, for less. One bundle per plan.
Add-Ons
REST add-ons share your tier's unified request pool, one number to track.
WebSocket Streaming
Live market data via STOMP. Pick a package or skip entirely.
$GERO staking discount
Hold $GERO to save up to 20%
Hold $GEROGeroWallet's native Cardano token. Holding $GERO in any Cardano wallet automatically unlocks Nexus API discounts, Gero Card fee waivers, and on-chain governance voting. to unlock a sliding discount on your Nexus subscription, from 5% at $50 staked up to 20% at $1,000+. Connect your Cardano wallet to preview your qualifying tier now.
Price Summary
Frequently asked questions
Everything you need to know about the Nexus API.
What is Nexus?
Nexus is a managed multi-chain data and transaction API. Each API key is scoped to one chain and one network, and every chain runs on one account, one base URL, and one auth header. On Cardano that surface covers chain data, with add-ons that enable market data across all 11 DEXes, FIFO wallet analytics, and a transaction builder. Live WebSocket streaming is a separate package. Everything is plain REST with an OpenAPI 3.1 spec, so you never have to run blockchain infrastructure yourself.
Which blockchains does Nexus support?
Cardano, Bitcoin, and Midnight are all live today. Cardano has the deepest coverage: chain data, DEX market data, wallet analytics, transaction building, and streaming. Bitcoin covers addresses, blocks, fees, mempool, ordinals inscriptions and runes, and transaction submit. Midnight covers network info, unshielded transaction build and submit, and DUST registration. Each API key is scoped to one chain and one network, so you integrate once and add chains without re-architecting.
How is Nexus different from Blockfrost, Maestro, or Koios?
Those APIs focus on raw Cardano chain queries. Nexus adds a full stack on the same Cardano API surface: DEX market data, FIFO profit-and-loss wallet analytics, and a server-side transaction builder as opt-in add-ons, with live WebSocket streaming as its own package. All of it sits behind multi-provider failover for redundancy and flat, predictable pricing.
Who builds Nexus?
Nexus is built and operated by A.D. Labs LTD, the team behind GeroWallet, the non-custodial Cardano and Midnight wallet. GeroWallet runs on Nexus in production: its market data, swap routing, and transaction building all go through this API. Nexus is a separate product with its own plans, and you do not need the wallet to use it.
How much does Nexus cost?
Flat monthly plans, no per-call metering. Starter is $9 for 3M requests a month, Builder $29 for 10M with a 7-day trial, Growth $79 for 30M, Scale $199 for 50M, and Enterprise $499 for 200M with every add-on included. Add-ons start at $5, and bundles cover several for $19 or $29.