Add Codex to developer-tools.mdx (#118)

Add Codex to developer tools page. Will update again when we finalize MPP support.

Author: Nealo

src/pages/quickstart/developer-tools.mdx

@@ -124,6 +124,12 @@ View the Chainlink Data Stream deployed on Tempo [here](https://explore.tempo.xy
 
 Developers can explore CCIP, Data Streams, and the full Chainlink platform through the [Chainlink Developer Docs](https://docs.chain.link/).
 
+### Codex
+
+[Codex](https://www.codex.io) is an enriched blockchain data API covering 70M+ tokens and 700M+ wallets across 90+ chains, including Tempo. Developers can query real-time USD pricing, token analytics, holder data, trading pair statistics, stablecoin activity, and prediction market data through a single GraphQL API — without managing infrastructure or decoding raw data.
+
+Get started with the [Codex docs](https://docs.codex.io), explore the API with the [API explorer](https://docs.codex.io/explore), and try the [TypeScript SDK](https://github.com/Codex-Data/sdk).
+
 ### CoinGecko
 
 [CoinGecko](https://www.coingecko.com) provides comprehensive cryptocurrency market data, including prices, trading volume, market capitalization, and token metadata. Developers can use the CoinGecko API to access Tempo token data for building dashboards, portfolio trackers, and analytics tools.