Blockchain Data API & Developer Tools

Nansen empowers crypto teams and developers with advanced blockchain data access through a comprehensive API platform, transforming complex on-chain data into actionable trading insights with remarkable simplicity. The platform provides structured, real-time on-chain token insights that can be integrated into trading platforms, dashboards, and applications across 18+ blockchain networks.

API Capabilities and Use Cases

The Nansen API serves three primary use cases: Trading (tracking Smart Money and whale movements, inspecting token inflows/outflows, catching alpha signals), Data Enrichment (enhancing internal or external dashboards with Nansen's unique endpoints and blending proprietary data), and AI Agents (plugging private or public agents directly to Nansen data, built specifically for agent integration). The API provides access to Smart Money Tracking featuring a curated list of top-performing wallets ranked by realized profit and win rate, leveraging Nansen's unique labeling and categorization of 500M+ addresses and 1,000+ entities.

Data Coverage and Processing

The platform delivers actionable aggregated data that is easy to implement rather than raw blockchain data requiring extensive processing. Nansen processes over 500TB of data daily across all major chains including Ethereum, Arbitrum, Solana, Polygon, Avalanche, Optimism, BNB Chain, and Ronin. The same endpoints powering Nansen's dashboard are available through the API, including Smart Money tracking, Token God Mode, and Profiler.

Model Context Protocol (MCP) for AI Agents

Nansen MCP provides AI agents with structured access to on-chain intelligence, enabling seamless integration of Nansen's blockchain analytics into autonomous systems and AI-powered applications. Unlike traditional APIs designed for human developers, MCP provides structured JSON responses optimized for machine consumption and agent decision-making. This enables AI agents to access Smart Money tracking, wallet profiling, token screening, and other intelligence. Case studies show successful integrations where MCP has been used to power intelligent agents for platforms like Corbits (with x402 integration) and Synternet (multi-agent UI systems).

Command-Line Interface

The Nansen CLI provides terminal-based access to on-chain intelligence for developers, researchers, and power users who prefer command-line workflows. The open-source tool (available on GitHub) enables programmatic access to Nansen's blockchain analytics through structured JSON responses, perfect for scripting, automation, and integration into data pipelines. Common use cases include building custom analysis scripts, automating research workflows, creating personalized alert systems, backtesting trading strategies with historical on-chain data, and prototyping AI agent behaviors.

Pricing and Integration

The API follows a pay-as-you-go model with credit-based pricing. Free users receive 100 non-renewing credits for testing basic endpoints. Pro users get 1,000 initial credits with access to all endpoints including Nansen's proprietary data, with the ability to purchase additional credits at $0.001 per credit. Real-world success stories include WIDI (Solana copy-trading app), Tier 1 market-making firms automating insight pipelines, WebCapital automating token research, and DeFi wallet platforms spotting Smart Money trends. Clients consistently report that the API is fast, reliable, and a game-changer for trading-focused applications.