OP API by Etherscan

The complete API for OP data

Query OP balances, transactions, tokens, contracts, and logs using the same Etherscan API that powers OP Mainnet Etherscan, with one API key and chainid=10.

Get your API Key Read the docs

Trusted by teams at

OP Network ● Live

Balances Tokens Contracts Logs and more..

OP Mainnet chain ID

11155420

OP Testnet chain ID

60+ EVM Chains

with one API key

99.99%

uptime status

Why teams choose Etherscan API for OP data

Explorer-grade blockchain data for teams that need accuracy, coverage, scale, and a clear path to multichain data from day one.

The first-choice API for OP data

When teams need blockchain data they can defend in front of users, finance, or compliance, they start with the Etherscan API.

The reference layer for onchain data

Built with OP Mainnet Etherscan data, the API is used as a reference point to verify balances, transfers, internal transactions, and contract activity on OP.

Accuracy that holds up under scrutiny

Capture edge cases many providers miss and reduce time spent reconciling mismatched records across tools.

One integration, 60+ chains

Same endpoints, same structure, one API key across OP and other chains. Just set chainid=10 for Mainnet or chainid=11155420 for Testnet.

OP data through a familiar API

Use the same request parameters, response formats, and API conventions that power OP Mainnet Etherscan and other Etherscan-supported explorers.

The default for mission-critical data

If blockchain data is mission-critical, Etherscan API is the default choice for teams that need accuracy and reliability.

How to start querying OP with Etherscan API

Get an API key, set the OP chain ID, and call the same endpoint structure used across 60+ EVM chains.

API key Active

YourApiKeyToken

One key for OP + 60+ chains

Step 1

Get your API key

Create an Etherscan API key and use it for OP Mainnet, Testnet, and other supported chains.

OP Mainnet 10

OP Testnet 11155420

chainid=10 V2

Step 2

Set the OP chain ID

Pass chainid=10 for OP Mainnet or chainid=11155420 for OP Testnet in Etherscan API requests.

OP query Ready

Balances & transfers

Contracts & logs

Tokens & receipts

Step 3

Call OP endpoints

Use familiar account, token, contract, transaction, and log endpoints to pull OP Mainnet Etherscan-grade indexed data into your app.

Single API to access all Endpoints & Metadata

Use Etherscan API with chainid=10 to query indexed OP data through a familiar endpoint structure.

Account Endpoints

Get balances, transactions, token transfers, mined blocks, withdrawals, and funded-by data for an address.

/account/*

Block Endpoints

Get block rewards, transaction counts, countdowns, block numbers by timestamp, and daily block statistics.

/block/*

Contract Endpoints

Fetch contract source code, ABIs, creators, creation transactions, and verification status.

/contract/*

Gas Tracker Endpoints

Read gas oracle recommendations, estimate confirmation time, and review daily gas statistics.

/gastracker/*

Geth/Parity Proxy

Use JSON-RPC compatible methods for blocks, calls, storage, gas price, transactions, receipts, and raw sends.

/proxy/*

Logs Endpoints

Retrieve event logs by address, topics, or both with optional block range filtering.

/logs/*

Stats Endpoints

Get native token price and supply, node count, chain size, and daily network statistics.

/stats/*

Transaction Endpoints

Check contract execution status and transaction receipt status by transaction hash.

/transaction/*

Token Endpoints

Fetch token supply, balances, holder lists, holder counts, top holders, token info, and token inventory.

/token/*

L2 Deposits/Withdrawals

Retrieve Plasma deposits, bridge deposits, and withdrawal transactions for an address.

/account/*

Name tags

Get name tags, labels, reputation, and related metadata for the specified address.

/nametag/*

Usage

Check API credit usage and limits, and retrieve supported chain metadata with Chainlist.

/getapilimit

All Etherscan API Endpoints

View all our available endpoints on Etherscan API documentation.

View All Endpoints

What you can build with the OP API

Build OP wallets, accounting tools, security products, and analytics without operating a separate blockchain indexer.

OP transaction reconciliation API visual

Transaction Reconciliation

Match OP normal and internal transactions, token transfers, fees, timestamps, and execution status with ledger entries and imported wallet records.

Build with: /txlist /txlistinternal /getstatus and more

Tax & Accounting

Turn OP activity into tax filings, accounting workflows, and audit reports with internal transactions, token transfers, historical balances, and address metadata.

Build with: /tokenbalance /txlist /tokennfttx and more