Question 1

What does Etherscan do?

Accepted Answer

Etherscan is the most widely used Ethereum block explorer, and its API is the definitive gateway for querying on-chain Ethereum data without running a full Ethereum node. The Etherscan API provides access to transaction histories, smart contract source code and ABIs, token transfer events, gas price data, block information, and event logs across Ethereum mainnet and all major testnets. For Nigerian Web3 developers, DeFi builders, NFT creators, and crypto businesses operating on Ethereum or EVM-compatible chains, Etherscan is the essential blockchain data layer.

Nigeria's crypto ecosystem has seen explosive growth, with millions of Nigerians using Ethereum-based assets — particularly USDT (ERC-20), DAI, and USDC — as a hedge against naira depreciation and as a medium for international payments. Nigerian developers building applications that interact with these assets need to query Ethereum state: Who sent what to whom? Was this transaction confirmed? What is my token balance? What events did this smart contract emit? Etherscan's API answers all of these questions reliably, with a free tier accessible to any developer.

The Account module provides the most frequently used endpoints. GET /api?module=account&action=txlist&address={address} returns the full transaction history for any Ethereum address — every inbound and outbound transaction with timestamps, values, gas used, and status. This is the data behind any "Transaction History" feature in a wallet or DeFi dashboard. The tokentx endpoint returns all ERC-20 token transfers involving an address, and the tokennfttx endpoint returns ERC-721 (NFT) transfers. Nigerian crypto businesses that accept USDT payments can monitor inbound transfers programmatically using these endpoints.

The Contract module retrieves verified smart contract ABIs via getabi and source code via getsourcecode. Etherscan serves as a global repository of verified Ethereum smart contracts — when a developer deploys a contract and verifies it on Etherscan, the source code and ABI become permanently accessible via the API. Nigerian developers can fetch contract ABIs dynamically rather than bundling them in their frontend code, simplifying development and ensuring they always have the latest ABI.

The Gas Tracker (gasoracle endpoint) returns current safe, standard, and fast gas prices in Gwei, along with base fee and estimated confirmation times. This is critical for Nigerian DeFi applications that help users estimate transaction costs before confirming — avoiding situations where users pay unexpectedly high gas fees.

Logs module queries allow searching for contract events (Ethereum logs) by address and topic, enabling Nigerian developers to build event-driven applications that react to smart contract activity: NFT mints, DEX swaps, DAO votes, protocol liquidations, and more. The ability to query historical event logs without an indexing service like The Graph makes Etherscan a simpler starting point for many applications.

Statistics endpoints return network-wide metrics: total Ether supply, daily transaction counts, average block time, and price data. Token endpoints return information about ERC-20 tokens: total supply, holder count, and price data for tokens with market data.

The free API key (obtained at etherscan.io/apis) supports 5 requests per second and 100,000 requests per day — more than sufficient for a Nigerian crypto startup in early stages. Paid plans at $199/month (Standard) and $399/month (Advanced) unlock higher rate limits. Etherscan also provides equivalent APIs for other EVM chains through its family of block explorers: BscScan (for BSC/BNB Chain), PolygonScan, Arbiscan, and Optimistic Etherscan — each with separate API keys but identical endpoint structures.

Question 2

How much does Etherscan cost?

Accepted Answer

Etherscan is free to start, with paid tiers for higher usage (freemium). Free: 5 calls/sec, 100,000 calls/day. Standard $199/mo: 10 calls/sec. Advanced $399/mo: 20 calls/sec. Pro custom pricing.

Question 3

How do I authenticate with the Etherscan API?

Accepted Answer

API Key

Question 4

Is there a rate limit on Etherscan?

Accepted Answer

5 calls/second on free tier; up to 20+ on paid

Question 5

Does Etherscan offer a sandbox or test mode?

Accepted Answer

No public sandbox is documented for Etherscan. Check the official docs for the recommended way to test integrations safely before going live.

Question 6

What is Etherscan best suited for?

Accepted Answer

Nigerian DeFi developers, blockchain explorers, and Web3 apps needing on-chain Ethereum transaction data, contract verification, token balances, and event logs.

Question 7

Is there anything else I should know before integrating Etherscan?

Accepted Answer

The most trusted Ethereum block explorer API. Essential for any dApp that needs to display transaction history, verify smart contracts, or track token transfers on Ethereum and EVM chains.

Question 8

Where can I find Etherscan's documentation?

Accepted Answer

The official API documentation is at https://docs.etherscan.io/. The provider's website is https://etherscan.io/apis.

Question 9

Does Etherscan support Nigerian developers?

Accepted Answer

Yes — Etherscan explicitly supports Nigerian developers/use cases.

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