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MCP Server add-on. Nexus exposes a Model Context Protocol (MCP) server so AI agents (Claude Desktop, Claude Code, or any MCP client) can query Cardano, Bitcoin, Midnight, and market data, and build transactions, as native tools.
The MCP endpoint requires the MCP Server add-on. Calls without it fail with the JSON-RPC error {"errorCode": "mcp_addon_required"}. The single MCP add-on unlocks all tools below; you do not need the Market Data or Transaction Builder add-ons separately to use their MCP tools.

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Connecting

  • Endpoint: https://nexus.gerowallet.io/mcp/
  • Auth: your Nexus API key (X-Api-Key: nexus_… or Authorization: Bearer nexus_…)
Example Claude Desktop / Claude Code config: 
{
  "mcpServers": {
    "nexus": {
      "url": "https://nexus.gerowallet.io/mcp/",
      "headers": { "X-Api-Key": "nexus_your_api_key_here" }
    }
  }
}
Health check: GET /mcp/health (no add-on required).

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Tools

The server registers 25 tools across six domains.

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Cardano (8)

cardano_account_info · cardano_account_history · cardano_address_info · cardano_asset_info · cardano_block_info · cardano_epoch_info · cardano_pool_info · cardano_tx_info

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Bitcoin (4)

bitcoin_balance · bitcoin_tx_info · bitcoin_fee_estimate · bitcoin_utxos

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Market Data (4)

market_price · market_ohlcv · market_pair_list · market_top

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Midnight (4)

midnight_info · midnight_dust_status · midnight_build_unshielded · midnight_submit

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Transaction Builder (2)

cardano_build_unsigned · cardano_preview_tx

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Account (3)

me · my_api_keys · my_subscription
Tool calls count against your plan’s request quota and rate limit like any other API usage, and every call is audit-logged.