CryptoTutorialJune 3, 2026
Tutorial: Build a CoinGecko-Powered Market Dashboard
A practical walkthrough — fetch live BTC/ETH data, render charts, and add an LLM-generated headline. Stack: FastAPI + React + Claude.
Trinity Desk·2 min read
What we're building
A single-page market dashboard pulling live BTC/ETH data, rendered with Recharts, with an LLM-generated headline summary on top.
Step 1 — Wire CoinGecko
Use the public endpoint /coins/markets with the sparkline=true parameter. Cache responses for 60 seconds to stay polite to the free tier.
Step 2 — Render with Recharts
The <AreaChart> component handles the sparkline shape; pass the price array directly and color the stroke based on 24h delta.
Step 3 — Add the AI headline
Pipe the current snapshot to Claude Sonnet 4.6 with a strict 2-sentence system prompt. Cache the result for 10 minutes.
#Tutorial#FastAPI#CoinGecko