Overview of the 3xpl.com JSON API MCP Server

The 3xpl.com JSON API MCP server bridges large language models (LLMs) with real‑time blockchain data across 48 distinct blockchains. By exposing a standardized Model Context Protocol (MCP) interface, the server enables AI assistants such as Claude to query, aggregate, and interpret on‑chain information without custom connectors for each network. This eliminates the need for developers to write bespoke integration code, allowing them to focus on building higher‑level logic and user experiences.

At its core, the server offers a rich set of tools that perform common blockchain queries: resolving ENS domains to native addresses, listing blockchains where a particular transaction or address exists, fetching the latest block height, and retrieving fee statistics. More advanced operations aggregate transactional details—such as summing all transfers within a block or compiling an address’s confirmed and pending balances. These capabilities are accessible through simple JSON requests, making them easily consumable by any LLM that supports MCP. The server also provides a single prompt () designed to guide the model toward deeper data exploration, ensuring responses are both accurate and contextually rich.

Developers benefit from the server’s modular design. Each tool is self‑contained, documented, and versioned independently, allowing teams to enable or disable functionality as needed. The ability to aggregate data on‑the‑fly reduces round‑trips to external APIs and improves latency, which is critical for real‑time applications such as trading bots, portfolio dashboards, or decentralized finance (DeFi) analytics. Because the MCP interface standardizes tool discovery and invocation, integrating 3xpl into existing AI workflows requires minimal effort—often just a single configuration change in the assistant’s toolset.

Real‑world scenarios where this MCP server shines include:

• Portfolio monitoring – aggregating balances and recent activity across multiple chains in a single query.
• Transaction monitoring – detecting pending transfers or mempool congestion to trigger alerts for traders.
• Compliance and audit – automatically retrieving fee histories or block summaries to support regulatory reporting.
• Smart contract debugging – querying event counts and transaction details to pinpoint issues during development.

A standout advantage of the 3xpl MCP server is its breadth: supporting 48 blockchains means a single AI assistant can provide cross‑chain insights without needing separate adapters. Combined with the server’s comprehensive aggregation tools, developers can deliver sophisticated blockchain analytics while keeping their codebase lean and maintainable.