To get started immediately, see our blog post with simple migration instructions.

Etherscan API Alternative — Migrate to Blockscout PRO API

Same endpoint structure. More chains. Higher limits. Lower price. Migrate in minutes.

Why Developers Are Switching

Etherscan has reduced free-tier API access for major chains including Base and Optimism. Developers building production applications need reliable, predictable API access — not surprise cutoffs. Blockscout PRO API provides Etherscan-compatible endpoints across 100+ EVM chains with higher rate limits and more generous usage allowances at every pricing tier. Free-tier access is available on all supported chains with no restrictions.

Side-by-Side Comparison

Feature	Blockscout PRO API	Etherscan API
Free tier RPS	5	3
Free tier chains	All supported	Limited
$49/mo RPS	15	5
$49/mo credits/calls	100M credits	100K calls
$199/mo RPS	30	10
$199/mo credits/calls	500M credits	200K calls
Multichain access	Single API key	Per-chain keys
API keys per account	Up to 50	Limited
Usage dashboard	Real-time	Basic

Migration Is a One-Line Change

Blockscout follows the same API structure and request format. In most cases, migrating means simply updating the base URL.

Before (Etherscan)

https://api.etherscan.io/api?module=account&action=balance&address=0x...&apikey=YOUR_KEY

After (Blockscout PRO API)

https://eth.blockscout.com/api?module=account&action=balance&address=0x...&apikey=YOUR_KEY

Migration Checklist

Create a free account at dev.blockscout.com
Generate your API key
Find your chain’s base URL at chains.blockscout.com
Update baseURL in your API client configuration
Update apikey parameter with your Blockscout PRO API key
Test core endpoints (account balance, transaction list, contract ABI)
Monitor usage in the developer portal dashboard

Supported Chains Comparison: Blockscout vs Etherscan

Chains listed by Chain ID

Legend: ✅ Supported · ❌ Not supported · ⚠️ Paid tier only (Etherscan)Bold rows = exclusive to one explorer. \

Blockscout: 117 chains
- Etherscan: 68 chains \
Shared: 20 chains.

Chain Name	Chain ID	Blockscout Pro API	Etherscan API
Ethereum Mainnet	1	✅	✅
Goerli Testnet	5	✅	❌
OP Mainnet	10	✅	⚠️ Paid only
Rootstock Mainnet	30	✅	❌
Rootstock Testnet	31	✅	❌
XDC Mainnet	50	❌	✅
XDC Apothem Testnet	51	❌	✅
BNB Smart Chain Mainnet	56	❌	⚠️ Paid only
Ethereum Classic	61	✅	❌
ETC Mordor Testnet	63	✅	❌
Shibuya Testnet	81	✅	❌
Viction Mainnet	88	✅	❌
Viction Testnet	89	✅	❌
BNB Smart Chain Testnet	97	❌	⚠️ Paid only
Gnosis	100	✅	✅
Fuse Mainnet	122	✅	❌
Fuse Spark Testnet	123	✅	❌
Unichain Mainnet	130	✅	✅
Polygon Mainnet	137	✅	✅
Monad Mainnet	143	❌	✅
Sonic Mainnet	146	❌	✅
ShimmerEVM Mainnet	148	✅	❌
HashKey Chain Mainnet	177	✅	❌
BitTorrent Chain Mainnet	199	❌	✅
opBNB Mainnet	204	❌	✅
TAC Mainnet	239	✅	❌
Fraxtal Mainnet	252	❌	✅
zkSync Sepolia Testnet	300	✅	❌
Filecoin Mainnet	314	✅	❌
zkSync Era Mainnet	324	✅	❌
Shape Mainnet	360	✅	❌
OP Goerli Testnet	420	✅	❌
World Chain Mainnet	480	✅	✅
Blackfort Mainnet	488	✅	❌
Astar Mainnet	592	✅	❌
Redstone Mainnet	690	✅	❌
Matchain Mainnet	698	✅	❌
Social Network Testnet	749	✅	❌
Stable Mainnet	988	❌	✅
HyperEVM Mainnet	999	❌	✅
BitTorrent Chain Testnet	1029	❌	✅
ShimmerEVM Testnet	1073	✅	❌
IOTA EVM Testnet	1076	✅	❌
Lisk Mainnet	1135	✅	❌
Moonbeam Mainnet	1284	❌	✅
Moonriver Mainnet	1285	❌	✅
Moonbase Alpha Testnet	1287	❌	✅
Unichain Sepolia Testnet	1301	✅	✅
Story Aeneid Testnet	1315	✅	❌
Sei Testnet	1328	❌	✅
Sei Mainnet	1329	❌	✅
Story Mainnet	1514	✅	❌
Reya Network Mainnet	1729	✅	❌
PlayBlock Mainnet	1829	✅	❌
Soneium Mainnet	1868	✅	❌
LightLink Phoenix Mainnet	1890	✅	❌
LightLink Pegasus Testnet	1891	✅	❌
Swellchain Mainnet	1923	❌	✅
Swellchain Testnet	1924	❌	✅
Soneium Minato Testnet	1946	✅	❌
Stable Testnet	2201	❌	✅
KiteAI Mainnet	2365	✅	❌
KiteAI Mainnet (alt)	2366	✅	❌
KiteAI Testnet	2368	✅	❌
TAC St. Petersburg Testnet	2391	✅	❌
Fraxtal Hoodi Testnet	2523	❌	✅
Abstract Mainnet	2741	❌	✅
Nexus Staging Testnet	3941	✅	❌
Nexus Testnet	3945	✅	❌
Lisk Sepolia Testnet	4202	✅	❌
MegaETH Mainnet	4326	✅	✅
Memecore Mainnet	4352	❌	✅
World Chain Sepolia Testnet	4801	✅	✅
Blackfort Testnet	4888	✅	❌
Blackfort Mainnet (legacy)	4999	✅	❌
Mantle Mainnet	5000	❌	✅
Mantle Sepolia Testnet	5003	❌	✅
opBNB Testnet	5611	❌	✅
MegaETH Testnet	6342	✅	✅
MegaETH Testnet v2	6343	✅	❌
Everclear Testnet	6398	✅	❌
ZetaChain Mainnet	7000	✅	❌
ZetaChain Testnet	7001	✅	❌
Numine Mainnet	8021	✅	❌
Zenchain Mainnet	8408	✅	❌
Base Mainnet	8453	❌	⚠️ Paid only
IOTA EVM Mainnet	8822	✅	❌
Plasma Mainnet	9745	❌	✅
Plasma Testnet	9746	❌	✅
Monad Testnet	10143	❌	✅
Gnosis Chiado Testnet	10200	✅	❌
Tea Sepolia Testnet	10218	✅	❌
Shape Sepolia Testnet	11011	✅	❌
Abstract Sepolia Testnet	11124	❌	✅
Immutable zkEVM Mainnet	13371	✅	❌
Immutable zkEVM Testnet	13473	✅	❌
Sonic Testnet	14601	❌	✅
Ethereum Holesky Testnet	17000	✅	❌
Zilliqa EVM Mainnet	32769	✅	❌
Zilliqa EVM Testnet	33101	✅	❌
ApeChain Curtis Testnet	33111	❌	✅
ApeChain Mainnet	33139	❌	✅
Mode Mainnet	34443	✅	❌
EDU Chain Mainnet	41923	✅	❌
Arbitrum One Mainnet	42161	✅	✅
Arbitrum Nova Mainnet	42170	✅	❌
Celo Mainnet	42220	✅	✅
Etherlink Mainnet	42793	✅	❌
Avalanche Fuji Testnet	43113	❌	⚠️ Paid only
Avalanche C-Chain	43114	❌	⚠️ Paid only
Memecore Testnet	43521	❌	✅
Metabased Stratos Testnet	51010	✅	❌
Ink Mainnet	57073	✅	❌
Linea Sepolia Testnet	59141	❌	✅
Linea Mainnet	59144	❌	✅
ICB Testnet	73114	✅	❌
ICB Mainnet	73115	✅	❌
Polygon Amoy Testnet	80002	❌	✅
Berachain Bepolia Testnet	80069	❌	✅
Berachain Mainnet	80094	❌	✅
Blast Mainnet	81457	❌	✅
Base Goerli Testnet	84531	✅	❌
Base Sepolia Testnet	84532	✅	⚠️ Paid only
Creditcoin Mainnet	102030	✅	❌
Creditcoin Testnet	102031	✅	❌
Creditcoin Devnet	102032	✅	❌
Etherlink Shadownet	127823	✅	❌
Etherlink Testnet	128123	✅	❌
Taiko Mainnet	167000	❌	✅
Taiko Hoodi	167013	❌	✅
Filecoin Calibration Testnet	314159	✅	❌
World Mobile Testnet	323432	✅	❌
Arbitrum Sepolia Testnet	421614	✅	✅
Scroll Sepolia Testnet	534351	✅	✅
Scroll Mainnet	534352	✅	✅
Hoodi Testnet	560048	✅	✅
Crosschain Testnet	612044	✅	❌
Crosschain Mainnet	612055	✅	❌
EDU Chain Testnet	656476	✅	❌
Gensyn Testnet	685685	✅	❌
Pyrope Chain Mainnet	695569	✅	❌
Katana Bokuto	737373	❌	✅
Katana Mainnet	747474	❌	✅
Ink Sepolia Testnet	763373	✅	❌
Arc Testnet	5042002	✅	❌
Kaigan Mainnet	5278000	✅	❌
Zora Mainnet	7777777	✅	❌
Fluence Mainnet	9999999	✅	❌
Spotlight Mainnet	10058111	✅	❌
Spotlight Sepolia Testnet	10058112	✅	❌
Celo Sepolia Testnet	11142220	✅	✅
Ethereum Sepolia Testnet	11155111	✅	✅
OP Sepolia Testnet	11155420	✅	⚠️ Paid only
Citronus Testnet	34949059	✅	❌
Fluence Testnet	52164803	✅	❌
Reya Cronos Testnet	89346162	✅	❌
Blast Sepolia Testnet	168587773	❌	✅
Neon EVM Devnet	245022926	✅	❌
Neon EVM Mainnet	245022934	✅	❌
OP Interop Alpha 0 Testnet	420120000	✅	❌
OP Interop Alpha 1 Testnet	420120001	✅	❌
Polygon CDK Stavanger Testnet	686669576	✅	❌
Eden Testnet	3735928814	✅	❌
Arbitrum Blueberry Testnet	88153591557	✅	❌

Additional Blockscout feature set

Features available on Blockscout vs Etherscan

An itemized list of over 60 features and views available on Blockscout that are not available on Optimistic Etherscan is available here.

DAppscout DApp marketplace providing dapp discovery and interaction features.
BENS in addition to ENS support, protocols can submit their subgraphs to be supported. Blockscout allows multiple protocols to co-exist within a single network.
Ads and banner control - Ability to add, remove and curate your own ads/banners
Public tagging - a central microservice allows tags enabled on mainnet to be shown on other chains. This is especially useful for malicious address display.
Vera and BytecodeDB Bytecode - works for verification info on multiple chains
Roadmap, research and rollup-specific features
- Rollup-specific feature support (e.g. Fault proofs)
- DA support (e.g. Celestia)

API Differences

Endpoint differences between Blockscout & Etherscan

The following details endpoint differences between the Optimistic Etherscan and Blockscout Optimism instances. Endpoints vary slightly for different chains.

\

1. Account/Address Endpointsmodule=account

	Blockscout	Etherscan	Purpose
`action=eth_get_balance`	✅	❌	Mimics Ethereum JSON RPC’s eth_getBalance
`action=balance`	✅	✅	Get Ether Balance for Single Address
`action=balancemulti`	✅	✅	Get Ether Balance for Multiple Addresses
`action=pendingtxlist`	✅	❌	Get Pending Transactions by Address
`action=txlist`	✅	✅	Get Normal Transactions by Address
`action=txlistinternal`	✅	✅	Get Internal Transactions by Address
`action=tokentx`	✅	✅	Get ERC20 Token Transfers
`action=tokennfttx`	✅	✅	Get ERC721 Token Transfers
`action=token1155tx`	✅	✅	Get ERC1155 Token Transfers
`action=token404tx`	✅	❌	Get ERC-404 token transfer events by address
`action=tokenbalance`	✅	❌	Get Token Balance for Address
`action=tokenlist`	✅	❌	Get list of tokens owned by address
`action=getminedblocks`	✅	✅	Get list of blocks mined by address
`action=listaccounts`	✅	❌	Get a list of accounts and their balances
`action=txsBeaconWithdrawal`	❌	✅	Get Beacon Chain Withdrawals by Address and Block Range
`action=balancehistory`	❌	✅ (PRO)	Get Historical Ether Balance for an Address By BlockNo

2. Contract Endpoints

`module=contract`

	Blockscout	Etherscan	Purpose
`action=listcontracts`	✅	❌	Get list of any deployed contract
`action=getabi`	✅	✅	Get Contract ABI for verified contracts
`action=getsourcecode`	✅	✅	Get contract source code for a verified contract
`action=getcontractcreation`	✅	❌	Get contract creator address hash and creation transaction hash
`action=verify`	✅	❌	Verify Contract with Source Code
`action=verifysourcecode`	✅	✅	Verify Contract with JSON file
`action=checkverifystatus`	✅	✅	Check Verification Status
`action=verifyproxycontract`	✅	✅	Get Internal Transactions by Address
`action=checkproxyverification`	✅	✅	Get ERC20 Token Transfers
`action=verify_via_scourcify`	✅	❌	Verify a contract through
Sourcify
`action=verify_vyper_contract`	✅	❌	Verify a Vyper contract

3. Transaction Endpoints

`module=transaction`

	Blockscout	Etherscan	Purpose
`action=gettxinfo`	✅	❌	Get Transaction info including block number, sender, gas, +++
`action=gettxreceiptstatus`	✅	✅	Get Transaction Receipt Status
`action=getstatus`	✅	✅	Get Transaction Execution Status

4. Block Endpoints

module=block

	Blockscout	Etherscan	Purpose
`action=getblockreward`	✅	✅	Get Block Rewards
`action=getblockcountdown`	✅	✅	Get Block Countdown
`action=getblocknobytime`	✅	✅	Get Block Number by Time
`action=eth_block_number`	✅	❌	Mimics Ethereum JSON RPC’s eth_blockNumber.
`action=dailyavgblocksize`	❌	✅ (PRO)	Get Daily Average Block Size
`action=dailyblkcount`	❌	✅ (PRO)	Get Daily Block Count and Rewards
`action=dailyblockrewards`	❌	✅ (PRO)	Get Daily Block Rewards
`action=dailyavgblocktime`	❌	✅ (PRO)	Get Daily Average Time for A Block to be Included in the chain
`action=dailyuncleblkcount`	❌	✅ (PRO)	Get Daily Uncle Block Count and Rewards

5. Token Endpoints

`module=token`

Note other endpoints contain token specific information including module=stats and module=account.

	Blockscout	Etherscan	Purpose
action=getToken	✅	❌	Get Token Information
action=getTokenHolders	✅	❌	Get Token Holders
action=bridgedtokenlist	✅	❌	Get Bridged Tokens
action=tokenholderlist	❌	✅ (PRO)	Get Token Holders
action=tokenholdercount	❌	✅ (PRO)	Number of ERC20 token holders
action=tokeninfo	❌	✅ (PRO)	Token project info

6. Logs/Events Endpoints

`module=logs`

Both Etherscan and Blockscout use the getLogs endpoint which includes enhanced filtering capabilities

✅ action=getLogs - Get Event Logs by Address/Topics/Block Range

7. Proxy/ETH RPC Endpoints

Etherscan uses the Proxy module module=proxy to retrieve standard Ethereum JSON-RPC methods.For Blockscout, send post requests to
api.blockscout.com//json-rpcThe following methods are supported:

eth_blockNumber
eth_getBalance
eth_getLogs
eth_gasPrice
eth_getTransactionByHash
eth_getTransactionReceipt
eth_chainId
eth_maxPriorityFeePerGas
eth_getTransactionCount
eth_getCode
eth_getStorageAt
eth_estimateGas
eth_getBlockByNumber
eth_getBlockByHash
eth_sendRawTransaction
eth_call

8. Stats/Network Information

`module=stats`

In addition to these stats, Blockscout provides general chain stats via the REST API.

	Blockscout	Etherscan	Purpose
tokensupply	✅	✅	Get Token Information
ethsupplyexchange	✅	❌	total supply in Wei from exchange
ethsupply	✅	✅	Get total supply in Wei from DB
ethsupply2	❌	✅	Get amount of Ether in circulation, ETH2 Staking rewards, EIP1559 burnt fees, and total withdrawn ETH from the beacon chain
coinsupply	✅	❌	Get total coin supply from DB minus burnt number
ethprice	✅	✅	Get latest price of native coin in USD and BTC
coinprice	✅	❌	Get latest price of native coin in USD and BTC in more general format
totalfees	✅	❌	Get total transaction fees in Wei paid by users to validators per day
chainsize	❌	✅	Get the size of the Ethereum blockchain, in bytes, over a date range.
nodecount	❌	✅ (PRO)	Get total number of discoverable Ethereum nodes
dailytxnfee	❌	✅ (PRO)	Get Daily Network Transaction Fee
dailynewaddress	❌	✅ (PRO)	Get Daily New Address Count
dailynetutilization	❌	✅ (PRO)	Get Daily Network Utilization
dailyavghashrate	❌	✅ (PRO)	Get Daily Average Network Hash Rate
dailytx	❌	✅ (PRO)	Get Daily Transaction Count
dailyavgnetdifficulty	❌	✅ (PRO)	Get Daily Average Network Difficulty
ethdailyprice	❌	✅ (PRO)	Get Ether Historical Price

9. Gas Tracking

Etherscan Gas Tracker (module=gastracker)

✅ action=gasoracle - Get Gas Oracle
✅ action=gasestimate - Get Gas Estimate

Blockscout

✅ Gas information integrated into transaction and block data

Framework Compatibility

Blockscout works with the tools you already use:

Ethers.js — ethers.org provider docs
Hardhat — @ericxstone/hardhat-blockscout-verify
Foundry — Foundry verification guide
Remix — Direct deployment and verification support

Common Migration Patterns

JavaScript / Node.js

// Before
const api = axios.create({
  baseURL: "https://api.etherscan.io/api",
  params: { apikey: process.env.ETHERSCAN_KEY }
});

// After
const api = axios.create({
  baseURL: "https://eth.blockscout.com/api",
  params: { apikey: process.env.BLOCKSCOUT_KEY }
});

Python

# Before
BASE_URL = "https://api.etherscan.io/api"
API_KEY = os.environ["ETHERSCAN_KEY"]

# After
BASE_URL = "https://eth.blockscout.com/api"
API_KEY = os.environ["BLOCKSCOUT_KEY"]

Multichain Setup

// One API key, multiple chains
const chains = {
  ethereum: "https://eth.blockscout.com/api",
  base: "https://base.blockscout.com/api",
  optimism: "https://optimism.blockscout.com/api",
};

async function getBalance(chain, address) {
  const res = await fetch(
    `${chains[chain]}?module=account&action=balance&address=${address}&apikey=${API_KEY}`
  );
  return res.json();
}

Beyond Etherscan Compatibility

Blockscout also provides a modern REST API with capabilities not available through Etherscan-compatible endpoints, including smart contract read/write interactions, advanced token metadata, NFT details, and chain health monitoring. → REST API Documentation

Start Free, Scale When Ready

No credit card. No chain restrictions. No surprise cutoffs. → Get Your API Key

Blockscout APIs

PRO API Endpoints

Additional Service APIs

API Archive

Migrate from Etherscan

Etherscan API Alternative — Migrate to Blockscout PRO API

Why Developers Are Switching

Side-by-Side Comparison

Migration Is a One-Line Change

Before (Etherscan)

After (Blockscout PRO API)

Migration Checklist

Supported Chains Comparison: Blockscout vs Etherscan

Additional Blockscout feature set

API Differences

\

2. Contract Endpoints

`module=contract`

3. Transaction Endpoints

`module=transaction`

4. Block Endpoints

5. Token Endpoints

`module=token`

6. Logs/Events Endpoints

`module=logs`

7. Proxy/ETH RPC Endpoints

8. Stats/Network Information

`module=stats`

9. Gas Tracking

Framework Compatibility

Common Migration Patterns

JavaScript / Node.js

Python

Multichain Setup

Beyond Etherscan Compatibility

Start Free, Scale When Ready

Blockscout APIs

PRO API Endpoints

Additional Service APIs

API Archive

​Etherscan API Alternative — Migrate to Blockscout PRO API

​Why Developers Are Switching

​Side-by-Side Comparison

​Migration Is a One-Line Change

​Before (Etherscan)

​After (Blockscout PRO API)

​Migration Checklist

​Supported Chains Comparison: Blockscout vs Etherscan

​Additional Blockscout feature set

​API Differences

​\

​2. Contract Endpoints

​module=contract

​3. Transaction Endpoints

​module=transaction

​4. Block Endpoints

​5. Token Endpoints

​module=token

​6. Logs/Events Endpoints

​module=logs

​7. Proxy/ETH RPC Endpoints

​8. Stats/Network Information

​module=stats

​9. Gas Tracking

​Framework Compatibility

​Common Migration Patterns

​JavaScript / Node.js

​Python

​Multichain Setup

​Beyond Etherscan Compatibility

​Start Free, Scale When Ready

Etherscan API Alternative — Migrate to Blockscout PRO API

Why Developers Are Switching

Side-by-Side Comparison

Migration Is a One-Line Change

Before (Etherscan)

After (Blockscout PRO API)

Migration Checklist

Supported Chains Comparison: Blockscout vs Etherscan

Additional Blockscout feature set

API Differences

\

2. Contract Endpoints

`module=contract`

3. Transaction Endpoints

`module=transaction`

4. Block Endpoints

5. Token Endpoints

`module=token`

6. Logs/Events Endpoints

`module=logs`

7. Proxy/ETH RPC Endpoints

8. Stats/Network Information

`module=stats`

9. Gas Tracking

Framework Compatibility

Common Migration Patterns

JavaScript / Node.js

Python

Multichain Setup

Beyond Etherscan Compatibility

Start Free, Scale When Ready