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Blockscout PRO API — Multichain Onchain Data, One API Key

Production-grade blockchain data across 100+ EVM chains. Familiar endpoints. Generous limits. Predictable pricing.

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The Problem

Building multichain? You’re probably managing separate API keys, billing accounts, and rate limits for every chain you support. When a provider drops free-tier access or changes terms without warning, your app breaks. Blockscout PRO API eliminates that fragmentation. One account, one API key, dozens of mainnets and testnets — with the same endpoint structure you already know.

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Why Developers Switch to Blockscout PRO API

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Multichain by Default

Access onchain data across all Blockscout-supported chains through a single API key. Add a new chain by changing a chain_id parameter — no new vendor setup, no duplicated integration work.
Swap chain_id=1 for chain_id=8453 (Base), chain_id=10 (Optimism), chain_id=534352 (Scroll), or any supported chain.

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What Chains are Supported?

The up-to-date list is available at dev.blockscout.com under supported chains.

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Mainnets

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Etherscan-Compatible Endpoints

Already using Etherscan V2’s unified API? Migration is trivial — the structure is nearly identical. Etherscan uses api.etherscan.io/v2/api?chainid=, Blockscout uses api.blockscout.com/v2/api?chain_id=. Same modules, same parameters — swap the base URL and key. → Migration Guide: Etherscan to Blockscout
All PRO API endpoints are documented individually in the API Reference menu

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More Capacity at Every Tier

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Explorer-Enriched Data

PRO API serves the same indexed, decoded, and structured data that powers Blockscout explorers. That means token metadata, proxy implementations, internal transactions, and contract context — not just raw RPC responses.

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Built For

  • Dapps & Wallets — Transaction history, token balances, NFTs, and contract activity across chains
  • AI Agents & Bots — Structured onchain data for monitoring, automation, and AI-driven workflows
  • Analytics & Research — Cross-chain behavior analysis, dashboards, and reporting
  • Operational Tooling — Debugging, compliance workflows, and internal monitoring

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Get Started in 3 Steps

  1. Create an account at dev.blockscout.com
  2. Generate your API key — free tier starts immediately
  3. Query any supported chain using familiar REST or JSON-RPC endpoints
No credit card required for the free tier. Upgrade when you’re ready. → Start Building

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Trusted Infrastructure

Blockscout powers explorers for 100+ L2s and scaling projects. The PRO API runs on the same infrastructure and data pipeline — formalized for production workloads with higher limits, real-time usage dashboards, and up to 50 API keys per account. → View Supported Chains → API Documentation → Developer Portal