# Crypto APIs blog

Engineering and market writing on blockchain infrastructure: protocol upgrades,
API patterns, and what they mean for teams building on-chain.

## What is here

- **Protocol and network news** — Ethereum upgrades, Polygon and Solana hard
  forks, Bitcoin standards, and what changes for anyone reading or writing to
  those chains.
- **Integration guides** — how to solve a specific problem with the API:
  deposit detection, xPub derivation, webhook handling, transaction signing.
- **Compliance and regulation** — AML screening, MiCA, sanctions data, and the
  practical effect on crypto businesses.
- **AI and agents** — MCP servers, the n8n node, x402 payments, and giving an
  agent on-chain ability without handing it a key.

## Elsewhere

- [Guides](https://cryptoapis.io/guides) — working end-to-end integrations that
  run on the free tier.
- [Products](https://cryptoapis.io/products) — the API surface itself.
- [Developer portal](https://developers.cryptoapis.io/) — the full REST
  reference.
- [RSS feed](https://cryptoapis.io/blog/rss.xml)