Make Your First Call

1. Get a key

Sign up at dev.blockscout.com with email, Google, or GitHub. Open the Keys section and click Create API Key. Keys start with proapi_ and are shown once — copy it somewhere safe, not into a Git repo. No credit card required for the free tier.

2. Make a call

Every PRO API call follows the same shape: one base URL, a chain_id to pick the network, and your key.

curl "https://api.blockscout.com/v2/api?chain_id=1&module=account&action=balance&address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&apikey=<your_pro_api_key>"

{
  "status": "1",
  "message": "OK",
  "result": "2464400000000000"
}

That’s the native ETH balance (in wei) for the given address on Ethereum mainnet.

3. Understand the parts

Part	What it does
`https://api.blockscout.com/v2/api`	The single base URL for every chain — no per-chain subdomain
`chain_id=1`	Selects the network. Swap for `8453` (Base), `42161` (Arbitrum One), `10` (Optimism), or any other supported chain
`module` / `action`	Together they pick the call — this example is the Etherscan-compatible `account`/`balance` pair
`apikey`	Your `proapi_...` key. Required on every tier, including free

The same request works on any chain by changing only chain_id — no new key, no new base URL, no separate account.

4. Try the REST API

The RPC-style call above mirrors Etherscan’s API shape for easy migration. Blockscout also has a REST API with richer, decoded data — human-readable transaction summaries, NFT metadata, contract read/write state, and more:

curl "https://api.blockscout.com/1/api/v2/addresses/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045?apikey=<your_pro_api_key>"

See the full REST API reference for what’s available.

Next steps

Rate limits and plans — know your credits before you build
Best practices — pagination, chain IDs, and efficient querying
Use cases — worked examples for wallet trackers, dashboards, and tax tools
Migrating from Etherscan? — swap your base URL and go

Blockscout APIs

PRO API Endpoints

Additional Service APIs

Make Your First Call

1. Get a key

2. Make a call

3. Understand the parts

4. Try the REST API

Next steps

​1. Get a key

​2. Make a call

​3. Understand the parts

​4. Try the REST API

​Next steps

1. Get a key

2. Make a call

3. Understand the parts

4. Try the REST API

Next steps