Documentation Index
Fetch the complete documentation index at: https://docs.blockscout.com/llms.txt
Use this file to discover all available pages before exploring further.
Blockscout PRO API — Multichain Onchain Data, One API Key
Production-grade blockchain data across 100+ EVM chains. Familiar endpoints. Generous limits. Predictable pricing.
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.Why Developers Switch to Blockscout PRO API
Multichain by Default
Access onchain data across all Blockscout-supported chains through a single API key. Add a new chain by changing achain_id parameter — no new vendor setup, no duplicated integration work.
chain_id=1 for chain_id=8453 (Base), chain_id=10 (Optimism), chain_id=534352 (Scroll), or any supported chain.
What Chains are Supported?
The up-to-date list is available at dev.blockscout.com under supported chains.PRO API Supported Chains (last update May 2026)
PRO API Supported Chains (last update May 2026)
Mainnets
| Chain | Chain ID |
|---|---|
| Arbitrum Nova | 42170 |
| Arbitrum One Nitro | 42161 |
| Astar | 592 |
| Awaji | 6497 |
| Base | 8453 |
| BXN | 488 |
| Celo | 42220 |
| Creditcoin | 102030 |
| Cross Mainnet | 612055 |
| Eden | 714 |
| EDU Chain | 41923 |
| Ethereum | 1 |
| Ethereum Classic | 61 |
| Etherlink | 42793 |
| Filecoin Virtual Machine | 314 |
| Flow Mainnet | 747 |
| Fuse | 122 |
| Gensyn | 685689 |
| Gnosis | 100 |
| HashKey | 177 |
| ICB Network | 73115 |
| Immutable zkEVM | 13371 |
| Ink | 57073 |
| IOTA EVM | 8822 |
| KiteAI Mainnet | 2366 |
| LightLink Phoenix Mainnet | 1890 |
| Lisk | 1135 |
| Matchain | 698 |
| MegaETH | 4326 |
| Moca Chain | 2288 |
| Mode | 34443 |
| Neon | 245022934 |
| Numine | 8021 |
| OP Mainnet | 10 |
| Playnance Playblock | 1829 |
Etherscan-Compatible Endpoints
Already using Etherscan V2’s unified API? Migration is trivial — the structure is nearly identical. Etherscan usesapi.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
More Capacity at Every Tier
| Blockscout PRO API | Etherscan | |
|---|---|---|
| Free | 100K credits/day · 5 RPS · All chains | 3 RPS · Limited chains |
| $49/mo | 100M credits · 15 RPS | 100K calls · 5 RPS |
| $199/mo | 500M credits · 30 RPS | 200K calls · 10 RPS |
| Enterprise | Custom | Custom |
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.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
Get Started in 3 Steps
- Create an account at dev.blockscout.com
- Generate your API key — free tier starts immediately
- Query any supported chain using familiar REST or JSON-RPC endpoints