SwapSS tools

Free crypto tools

Check an address before you send to it. See which network is cheapest right now. Convert units without rounding error, build a payment QR code, prove a signature. Every tool runs in your browser, needs no account, and names its source - or works with no network at all.

One rule covers all of them

These tools check, price and verify. They never create a secret, and never ask you for one.

No page here will generate a private key or a recovery phrase, and none has a box to type one into. If a site claiming to be us ever does, it is not us.

21
tools for checking, pricing and verifying - free, no account
8
send nothing you type to any server, provably
0
third-party scripts, trackers or sign-up walls

Addresses

Checked on your machine, before the money moves. Nothing on this page is transmitted, which is a claim you can test by unplugging.

Check a crypto address before you send to it

Check any crypto address before you send: which chain it belongs to, whether its checksum is valid, and whether the capitalisation still protects you from a typo.

Open Works offline

Verify a signed message

Verify a Bitcoin or Ethereum signed message against an address, entirely offline in your browser - confirms that a wallet controls an address without ever asking for a private key.

Open Works offline

Wallet safety

What an address has already agreed to, read straight from the chains themselves. These pages ask a public node a question about a public address; they never ask you for a key.

Compare two addresses before you send

Paste the address you are about to send to and the one you were given. This page tells you whether they are the same address, where they differ, and whether either hides an invisible or look-alike character. Runs in your browser.

Open Works offline

What am I actually signing?

Paste the signature request your wallet is showing you. This page decodes it, computes the same hash your wallet does, and says in plain words what signing would allow - which contract, over which token, with what limit and what expiry.

Open Works offline

Token approval checker for six chains

See which contracts your wallet has allowed to spend its tokens, across Ethereum, Base, Arbitrum, OP Mainnet, Polygon and BNB Chain. Paste a public address; no wallet connection, no sign-up.

Open Live data

What the issuer of a token can do to your balance

Read a token contract and see whether whoever runs it can freeze your balance, take it, pause transfers, mint more, or replace the code. Paste the address; no wallet connection, no sign-up.

Open Live data

Fees and amounts

What a transfer actually costs, and how to convert between units without losing a digit.

XMR to USD converter

Convert Monero to US dollars, euros and other currencies at the live market price. Runs in your browser with no tracking and no sign-up.

Open Live data

Cheapest network to send right now

What a transfer costs right now on twelve networks, in dollars and in the native coin, sorted cheapest first. Read by your browser, with nothing to type.

Open Live data

USDT TRC-20 fee calculator

Calculate the real cost of a USDT TRC-20 transfer with a live simulation against the TRON network - actual energy and bandwidth for your recipient, not a hardcoded average.

Open Live data

Which chain is cheapest to send on right now

Live gas prices across Ethereum and the major EVM chains, with the real cost of a transfer in dollars, sorted cheapest first. No sign-up, no tracking.

Open Live data

Convert wei, gwei and ether without rounding errors

Convert wei, gwei and ether, satoshi and BTC, piconero and XMR, or any token by its decimals. Exact integer math, no rounding, runs offline in your browser.

Open Works offline

Bitcoin dust limit, and what a sweep costs

Whether a Bitcoin output is too small to relay, whether it is worth spending at the fee rate right now, and what it costs to sweep a pile of them into one. Two different limits, both shown.

Open Live data

Monero

The things people ask us about Monero most often, answered with live numbers rather than folklore.

Check your Monero confirmations and when the funds unlock

Check how many confirmations a Monero transaction has and when the funds become spendable under the 10-block lock rule, straight from a public block explorer.

Open Live data

Monero mining calculator for your CPU

Estimate XMR mining earnings from your actual CPU: pick your processor, add your electricity price, and see daily and monthly income after power costs at live difficulty.

Open Live data

Monero wallets compared on open source, Tor and your own node

Compare Monero wallets by platform, open-source status, node choice, Tor support, view-only mode, subaddresses and hardware compatibility - facts checked against each project.

Open Works offline

Check a Monero payment proof

Paste the proof string a sender gave you and find out whether it is true. The signature is checked in your browser against the transaction on the chain, and the amount is only reported once the commitment behind it agrees. No view key, no transaction key, nothing secret.

Open Live data

Monero network status

Live Monero conditions with an answer instead of a table: the mempool weighed against a block, all four fee tiers priced for a real transfer, recent block spacing, and every figure checked against a second source.

Open Live data

Where's my Monero? Diagnose a missing transaction

Paste a Monero transaction ID and find the specific reason a payment is not showing: not yet relayed, unmined, still locked, or landed somewhere your wallet cannot see - with the next action for each.

Open Live data

Which public Monero nodes answer right now

Sixteen public Monero nodes, probed from your own browser: which answer, what block they are on, how fast they reply, and which run with the full interface left open.

Open Live data

Getting paid

Payment requests a wallet can scan, built from a checksum-verified address.

Monero QR code generator that works offline

Generate a monero: payment URI and QR code from an address, amount and description - entirely offline in your browser. Nothing is sent anywhere.

Open Works offline

Bitcoin QR code generator with an amount built in

Create a BIP-21 bitcoin: payment link and QR code with an amount and label, generated offline in your browser with the address checksum verified first.

Open Works offline

Also free

Look up a transaction, an address or a block

Ten chains, read straight from public nodes: what a transaction did, what an address holds, what is in a block. Same rules as the tools - no account, nothing typed is sent to us.

Open the explorer

Questions people actually ask

Do I need an account to use these?

No. Every tool on this page works without signing in, and none of them asks for an email to show you a result.

Why is there no wallet or seed phrase generator here?

Because we would rather not be the place you type a recovery phrase, and because a generator page has to be trusted rather than verified: the code a site serves can change quietly, which is exactly how a well-regarded generator turned on its users in 2019. Use a hardware wallet, or an audited offline generator you downloaded and can re-check yourself.

Which tools use the network at all?

Only the ones that need a live number: prices, gas, and network difficulty. Each of those names the exact public source it queries on its own page, and the query goes from your browser straight to that source rather than through us.

What happens to what I paste in?

It stays in the tab. The offline tools have no server side to send it to at all, and the ones that need a live number send only that lookup - never the address, amount or transaction you typed.