Web3 Dev — Blockscout PRO API

This skill teaches the agent how to build software (apps, scripts, CLIs, bots, mobile/desktop clients) that reads blockchain data through the Blockscout PRO API — a single HTTP API covering 100+ EVM chains (94+ L2s and scaling projects). One API key works on every supported chain; switch chains by changing the chain_id path parameter on the call.

The PRO API returns explorer-enriched data: indexed, decoded, and structured — token metadata, proxy implementations, internal transactions, contract context, and so on. Use it for dApps and wallets, AI agents and bots, analytics platforms, and operational tooling.

For data the explorer has not pre-indexed — most importantly live or historical contract state at a specific block (e.g. balanceOf(addr) against a token contract at block N, totalSupply() at a past block, any view-function call, contract storage reads) — the PRO API also exposes eth_call through its JSON-RPC gateway. See Reading contract state. The same Bearer-token auth covers both surfaces; you do not need a separate RPC endpoint for historical contract reads.

The bundled files in references/ are the single source of truth for which endpoints exist and how to call them:

Do not classify endpoints into your own "families" or steer the user toward a subset. Every endpoint listed in the index is callable, and every endpoint uses the same authentication scheme described below.

API key — mandatory pre-flight