CoinGecko Launches Megafilter API for Cross-Chain Liquidity Pool Discovery

CoinGecko has launched a new feature called the Megafilter endpoint, which allows developers to aggregate and filter on-chain liquidity pool data across multiple blockchain networks and decentralized exchanges (DEXs) via a single API call. This powerful tool enables users to explore and identify high-potential liquidity pools while ensuring their trustworthiness and financial health [1].

The Megafilter API endpoint provides a paginated list of liquidity pool data, which can be sliced and diced using a variety of filter and sort parameters. These include networks, DEXs, fully diluted valuation (FDV), 24-hour trading volume, and transaction count, among others. Developers can combine these parameters to create highly specific queries. For example, users can request liquidity pools on Polygon, BSC, and Solana with a minimum FDV and trading volume of $10,000 by appending relevant filters to the request URL [1].

To use the Megafilter, developers need a CoinGecko Pro API key, which requires an Analyst plan or higher. The key must be securely stored, typically in a `.env` file, to avoid exposing it in client-side code. The guide emphasizes the importance of server-side execution for API requests in a production environment, particularly to protect API keys from unauthorized access [1].

The tutorial recommends using SvelteKit to build the web application, leveraging the Flowbite component library to create a user-friendly and responsive interface. Developers are walked through setting up the project, defining data types, building reusable components such as sorters and filters, and rendering the filtered results in a paginated table. The integration of components like dropdown menus and filter tabs allows users to interact with the data dynamically and efficiently [1].

A key part of the implementation involves mapping the structure of the Megafilter response into TypeScript types, ensuring data integrity and ease of handling. The API does not return standard pagination metadata such as total items or page numbers, so developers are advised to manage this manually or through custom logic. Additionally, filter options like “networks” require fetching data from other CoinGecko endpoints to populate valid selections before applying them to the Megafilter [1].

The final application allows users to dynamically update the displayed liquidity pool data by modifying filters or sorting options. Each interaction updates the table and the query string, reflecting the latest filtered results. The guide concludes with a GitHub repository link for quick setup and encourages developers to explore additional features such as building candlestick charting tools [1].

This development marks a significant step in simplifying liquidity pool discovery and management for DeFi developers and investors, offering a robust and customizable platform for exploring on-chain data.

Source: [1] How to Build a Liquidity Pool Finder App (https://www.coingecko.com/learn/build-liquidity-pool-finder-app)