How to Query Stellar's Horizon API Using Python and JavaScript

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Developer André Dias Moreira Prol has shared a practical guide on querying the Stellar blockchain's Horizon REST API using Python and JavaScript, drawing on his experience with tokenization and digital forensics projects. Horizon exposes account, transaction, asset, and operation data in JSON format, with built-in HAL-standard pagination that simplifies large-scale data retrieval. In Python, the requests library or the official stellar-sdk can be used to fetch balances and asset records, while JavaScript developers can leverage fetch and Server-Sent Events for real-time payment streaming. Prol notes that SSE-based streaming eliminated the need for constant polling in a digital wallet project, cutting infrastructure costs by around 30%. He emphasizes that Horizon handles read operations only, and transaction submission still requires local signing via an SDK before posting to the /transactions endpoint.

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How to Query Stellar Horizon API Using Python and JavaScript

Developer André Dias Moreira Prol has published a practical guide on querying the Stellar blockchain network using the Horizon REST API in both Python and JavaScript. The article explains how to retrieve account balances, transaction histories, and asset data through clean HTTP endpoints without requiring deep blockchain protocol knowledge. Prol highlights the Horizon API's streaming capability via Server-Sent Events, which enables real-time transaction monitoring without constant polling, reducing infrastructure costs. The guide also covers querying tokenized assets like USDC, including how to retrieve the number of wallets holding a given asset's trustlines. Code samples using the official stellar-sdk library are provided for both languages and are ready to run against the live Stellar network.

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