Why does the same address work on Ethereum, Polygon, Base, and so on?

Because every EVM-compatible chain uses **identical address derivation**. They all run the same virtual machine, all hash the same public key with **keccak256**, and all take the last 20 bytes. So `0xabc...` on Ethereum, Optimism, Arbitrum, Base, Polygon and BSC is **the same key holder** - if you control the private key on one, you control all of them. That is why this tool needs only one input box.

What is a "nonce" and why is it shown as the transaction count?

The **nonce** is a counter the chain keeps for every address: it goes up by 1 every time the address sends a transaction. The first transaction has nonce 0, the second has nonce 1, and so on. So `eth_getTransactionCount` returns the **next nonce**, which equals the **total number of outgoing transactions** the address has ever sent on that chain. It does not count tokens received or internal calls - just outgoing top-level transactions.

Why is the "first activity" not shown precisely?

A precise "first seen" date would require **scanning historical blocks** or querying an indexer like Etherscan, which costs an API key and a lot of bandwidth. Instead we use a **fast proxy**: if the address has a non-zero nonce OR a non-zero balance, we mark the chain as **active**. If both are zero, the address has never sent a transaction and has no current balance, so for practical purposes it is **inactive** on that chain.

What is the difference between gas spent and transaction count?

**Transaction count** is how many transactions you have sent. **Gas spent** is how much computation each transaction consumed (paid for in native currency). A wallet that signs 1,000 simple transfers and a wallet that signs 10 complex DeFi swaps can have very different gas footprints, but the count tells you about **activity volume**, not cost. This tool shows the count because it is cheap to fetch and it is a reliable signal of "has this wallet ever been used".

How do you tell a hot wallet from a cold wallet?

You cannot tell directly from on-chain data - the chain only sees an address, not the storage medium of the key. But there are strong signals: a **hot wallet** (signs often, used in dApps) tends to have a **high nonce** on multiple chains, frequent recent activity, and a low but non-zero balance. A **cold wallet** (long-term storage) usually has a **low nonce**, a high balance, and long periods of inactivity. This tool gives you the nonce and balance per chain, so you can form an educated guess.

What does "active" really mean here?

"Active" in this tool means **the chain has seen this address**: either the address has a positive native balance, or it has sent at least one transaction (nonce greater than zero), or both. It does **not** mean the wallet is actively used today - an address that sent one transaction in 2017 and has dust left will still show as active on Ethereum. For recent activity you would need a block-by-block scan, which we deliberately avoid to keep this fast and free.

Why do you only check six chains?

These six (Ethereum, Optimism, Arbitrum, Base, Polygon, BSC) cover the **vast majority of real value and activity** in the EVM ecosystem. Adding more chains means more parallel RPC calls, longer response times, and more failure surface from free public endpoints. The current six finishes in under two seconds and uses zero API keys. If you need an obscure L2, an explorer that indexes that chain is the right tool.

Where do the USD prices come from?

From the **CoinGecko public API** (the free, key-less `simple/price` endpoint). We fetch ETH, MATIC and BNB once per minute and cache the result, then multiply each native balance by the matching price. If CoinGecko is briefly unavailable we still show balances and transaction counts - only the USD column degrades to $0.

YourDevToolsPro

Multi-chain address activity

Paste one 0x address and see the balance, transaction count, and USD value on six EVM chains: Ethereum, Optimism, Arbitrum, Base, Polygon, and BSC. No wallet, no sign-in.

LiveRuns in your browser

Address activity across EVM chains

Paste a 0x address. The server queries six public JSON-RPC endpoints (Ethereum, Optimism, Arbitrum, Base, Polygon, BSC) in parallel, adds live CoinGecko prices, and shows the native balance, transaction count, and USD value per chain.

What we do with this query

We do not store the address, the balance, or your IP. The result for a single address lives only in memory for five minutes, so repeated checks do not hammer public RPC nodes. After that the cache entry is gone. No database, no logs.

You can query this endpoint up to 30 times per hour from a single IP. Cached lookups do not count against the limit.

What this tool does

Paste a single 0x wallet address and we check it across the six biggest EVM chains in one go: Ethereum, Optimism, Arbitrum, Base, Polygon and BNB Smart Chain. For each chain you see the native balance (ETH, MATIC, BNB), the transaction count, an active or inactive flag, and a USD value based on live CoinGecko prices.

Because every EVM chain uses the same address derivation, one string is enough. No wallet connection, no signature, no sign-in. The check is server-side, the address never lives in any database, and the result is cached for a few minutes to be polite to public RPC endpoints.

How to use it

Paste a 0x address in the input box. It must be exactly 40 hex characters after the 0x prefix. Case does not matter.
Click Check (or pick one of the sample addresses). The server fans out to all six chains in parallel - the whole check usually takes under two seconds.
Look at the summary banner: total USD across all chains, how many chains the address has touched, and the combined transaction count.
Each chain has its own card with the native balance (e.g. 0.42 ETH), the USD value at current price, and the transaction count from that chain.
Use the Open explorer link on any card to jump straight to Etherscan, Arbiscan, Polygonscan and friends for that chain.
Chains where the address has never been seen show as "inactive" with a zero balance and zero transactions - that is normal for a brand-new address.
Repeat the check after a few minutes and the result is served from cache: faster, and it does not count against your rate limit.

When this is useful

Seven typical multi-chain wallet checks:

Quick portfolio sanity check before sending funds: confirm an address actually has balance on the chain you think it does.
Recipient verification: pasted an unfamiliar 0x address from an invoice - is it a fresh wallet, a busy hot wallet, or a smart contract that already moved millions?
Debug a bridge transaction: did the funds actually land on the L2? Check Base or Arbitrum balance in one click without opening five block explorers.
Find a forgotten airdrop: an address that looks empty on Etherscan often has unclaimed tokens or balance on Polygon, Optimism, or BSC.
OSINT / threat-intel triage: see in seconds whether a phishing-related address has been active and how many transactions it has signed.
Estate / handover scenarios: someone needs to know which chains an address has been used on. A single look replaces a manual tour of six explorers.
DeFi research: before integrating with a protocol, check the deployer or treasury address across every chain it claims to operate on.

Questions and answers

A wallet address on every EVM chain is a 20-byte number written as 40 hex characters after the 0x prefix, for example `0xd8da6bf26964af9d7eed9e03e53415d37aa96045`. It is derived from your public key (the keccak256 hash of the key, last 20 bytes) and represents the destination for funds and the signer of transactions. Whether the address belongs to a person, a smart contract, or a multisig is not visible from the address itself.

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