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The Euro365 Blog

Tutorials, engineering notes, and field reports from building sportsbook infrastructure.

WebSocket vs Polling for Live Sports Odds: When Each Wins

Real-time sportsbooks have two ways to get odds into the browser: poll a REST endpoint, or hold a WebSocket open. Here's how to decide.

27 May 2026 · 9 min read

Engineering

What Data You Need to Build an In-Play Sportsbook (2026 Guide)

A practical checklist of the feeds, fields, and frequencies behind a working in-play sportsbook — odds, scores, suspensions, tracker, settlement.

27 May 2026 · 11 min read

Tutorial

How to Source 1X2 Odds Programmatically: A Practical Guide

1X2 is the simplest and most-traded market in soccer betting. Here's how to fetch, normalize, and use it via REST and WebSocket.

27 May 2026 · 7 min read

Comparison

Best Crypto-Friendly Sports Betting APIs in 2026

If you operate in a market where Stripe is shaky and PayPal is hostile, here are the sports-data APIs that accept BTC, USDT, and USDC.

27 May 2026 · 8 min read

Tutorial

Building a Live Odds Dashboard in React (with the Euro365 API)

Step-by-step: a small React app that displays live football odds and updates in real time. Hooks, debouncing, and a sensible re-render strategy.

27 May 2026 · 10 min read

Tutorial

Asian Handicap Odds via REST API: Lines, Outcomes, and Settlement

Asian handicap markets confuse new operators more than any other. Here's a clean breakdown of how AH is modeled in a modern odds API.

27 May 2026 · 9 min read

Engineering

Sportsbook Latency Budgets: What to Measure and Why It Matters

If your end-to-end latency from upstream price change to user-visible UI is over 1 second, sharp users will eat your lunch. Here's how to measure each hop.

27 May 2026 · 8 min read

Comparison

Sportsbook API Pricing in 2026: A Plain-English Breakdown

What you actually pay for sports-data APIs — listed prices, hidden fees, contract gotchas, and the realistic budget for a new sportsbook.

27 May 2026 · 9 min read

Tutorial

How to Build a Sportsbook Widget in 50 Lines of JavaScript

A complete walkthrough: fetch live odds, render a live-match widget, and ship it to production. No frameworks, no build step, ~50 lines of vanilla JS using the Euro365 sports API.

21 May 2026 · 8 min read