Add-ons & Streaming

The core API covers on-chain data: blocks, transactions, addresses, accounts, assets, epochs, stake pools, Bitcoin, and Midnight. Add-ons enable additional capability surfaces, and WebSocket packages add live streaming. An add-on is a separate paid SKU. A key that is in scope for the chain and network you are calling still returns HTTP 402 on an add-on endpoint until the matching add-on is active on its plan, so network scope and capability are two independent gates.

Add-ons

Add-on	Enables	Path prefixes gated
Market Data	Prices, OHLCV candles, DEX pools/orders/quotes/swaps, NFT stats, blueprints, leaderboard	`/api/market`, `/api/prices`, `/api/dex`, `/api/nft`, `/api/blueprints`, `/api/sync`, `/api/leaderboard`
Wallet Analytics	Holdings, value history, and FIFO-based P&L per wallet	`/api/wallet`
Transaction Builder	Server-side UTXO selection and unsigned CBOR for transfers, staking, governance, and DEX swaps	`/api/tx/`, `/api/aggregator`
MCP Server	Model Context Protocol endpoint to connect Claude and other AI agents to Nexus data and tools	`/mcp/`
IPFS	Gateway content resolve plus `stat`, `ls`, IPNS resolution, and per-key pinning	`/api/ipfs`

WebSocket packages

Live streaming is offered separately from add-ons. See WebSocket Streaming.

Package	Concurrent connections	Messages / mo
Starter	2	100,000
Pro	10	2,000,000
Unlimited	Unlimited	Unlimited

Enabling add-ons

Add-ons and WebSocket packages are managed from your account. Changes apply immediately.

Enterprise includes everything. The Enterprise plan bundles all add-ons and WebSocket Unlimited, with no separate setup.

How access is enforced

When you call an endpoint that belongs to an add-on you haven’t activated, Nexus returns HTTP 402 Payment Required:

{
  "error": "payment_required",
  "addon": "marketData",
  "message": "Upgrade required at https://nexus.gerowallet.io/dashboard/billing/"
}

The addon field tells you which add-on to enable. WebSocket access is enforced at connection time instead (see WebSocket Streaming).

Getting Started

Core Concepts

API Reference

Add-ons & Streaming

Add-ons

WebSocket packages

Enabling add-ons

How access is enforced

​Add-ons

​WebSocket packages

​Enabling add-ons

​How access is enforced

Add-ons

WebSocket packages

Enabling add-ons

How access is enforced