Nexus MCP Server: Connect Claude and AI Agents to Cardano Data
Nexus MCP Server: Connect Claude and AI Agents to Cardano Data
AI agents are becoming a real interface to software, and the Model Context Protocol (MCP) is how they call external systems as native tools. If you are building agent workflows that need blockchain data, or you simply want Claude to answer "what is this wallet holding?" with live chain data instead of guesses, the missing piece is an MCP server that speaks Cardano.
Nexus hosts one. Point Claude Desktop, Claude Code, Cursor, or any MCP-compatible client at https://nexus.gerowallet.io/mcp/, authenticate with your Nexus API key, and the agent gains 25 tools across six domains.
What your agent can do
Cardano (8 tools): account info and history, address info, asset info, block info, epoch info, stake pool info, and transaction lookups.
Market data (4 tools): token prices, OHLCV candles, pair listings, and top-token rankings from the same engine that indexes all 11 Cardano DEXes.
Bitcoin (4 tools): balances, transaction info, fee estimates, and UTXO sets.
Midnight (4 tools): network info, DUST status, unshielded transaction building, and submission.
Transaction building (2 tools): build unsigned Cardano transactions and preview them before anything is signed, signing stays with you, and no private keys ever touch Nexus.
Account (3 tools): inspect your own Nexus subscription, API keys, and profile from inside the conversation.
In practice that means an agent can research a token's price history, inspect a whale wallet, check a stake pool's performance, and draft an unsigned delegation transaction, all in one conversation, all against live data.
Setup in one config block
{
"mcpServers": {
"nexus": {
"url": "https://nexus.gerowallet.io/mcp/",
"headers": { "X-Api-Key": "nxs_your_api_key_here" }
}
}
}
That is the whole integration for Claude Desktop or Claude Code. A health check lives at GET /mcp/health, authentication is per API key, and every tool call is audit-logged and counted against your plan's normal request quota, governance your security team can reason about.
Why this beats teaching an agent your REST calls
You can always hand an LLM a REST spec and hope. MCP tools are the robust version: typed, named operations the agent discovers and calls natively, with authentication handled at the transport. One add-on unlocks the full tool set, the MCP tools for market data and transaction building work even without those REST add-ons on your plan.
What teams build with it
Research assistants that answer token, wallet, and pool questions with live on-chain and market data.
Operations copilots that monitor addresses and draft transactions for human sign-off.
Agent products that need a managed, authenticated blockchain backend instead of scraping or self-hosted indexers.
Internal tooling where "ask the agent" replaces writing one-off scripts against the chain.
Pricing
The MCP Server is a $19/month add-on on Builder ($29), Growth ($79), and Scale ($199), included in Enterprise ($499). Nexus is the only Cardano data platform with a hosted MCP endpoint today; for the full capability map, see the platform overview.
Give your agent the chain
Start the 7-day Builder trial at nexus.gerowallet.io, add the MCP Server add-on, paste the config block above, and ask your agent something only live data can answer.