Why I Built These
Every crypto tool I used asked for something. An email. A wallet connection. An account. Sometimes all three, just to see a gas price or calculate a trade.
I got tired of it. Your wallet address is sensitive data. Your trade history is sensitive data. Your portfolio is sensitive data. None of it should be sitting on someone else's server.
So, I built a suite of blockchain tools that work entirely in your browser. No login. No tracking. No server ever sees your data. Everything runs locally and saves to your browser's local storage — yours alone.
Here is every tool, what it does, and when you actually need it.
Live Market Tools
⛽ ETH Gas Tracker
solvebar.com/tools/eth-gas-tracker
Gas fees can triple within an hour during peak network activity. This tracker shows live Ethereum gas prices for slow, standard, and fast transactions — refreshing automatically every 15 seconds. Check it before any swap, contract interaction, or NFT mint. Timing your transaction right can save you serious money.
😱 Crypto Fear & Greed Index
solvebar.com/tools/fear-greed-index
One number that captures the mood of the entire crypto market — from 0 (extreme fear) to 100 (extreme greed). Historically, extreme fear has been a buying signal, and extreme greed has preceded corrections. It is not a perfect indicator, but it is one of the most watched sentiment tools in crypto for a reason.
Trading Calculators
📈 Crypto P&L Calculator
solvebar.com/tools/crypto-pnl-calculator
Enter your buy price, sell price, and amount. Get instant profit or loss in both dollar terms and percentage ROI. Simple, fast, and no account needed. Your trade data stays in your browser — it is not being logged anywhere.
📅 DCA Calculator
solvebar.com/tools/dca-calculator
What if you had bought $100 of Bitcoin every week for the last two years? Enter any coin, a recurring investment amount, start date, and frequency to see your hypothetical accumulated holdings and cost basis. It shows exactly how dollar-cost averaging would have performed compared to the current price.
🧾 Crypto Tax Estimator
solvebar.com/tools/crypto-tax-calculator
Nobody wants to think about crypto taxes, but doing a rough calculation before you sell is better than a surprise at year-end. Enter your trades — buy price, sell price, quantity, and holding period — to get an estimated capital gains tax liability. It supports both short-term and long-term rates. For estimation only — always consult a tax professional for filing.
🥩 Crypto Staking Calculator
solvebar.com/tools/crypto-staking-calculator
Enter your staking amount and APY to see daily, monthly, and annual rewards. It compares simple vs. compound staking returns side by side, so you can see exactly how much reinvesting your rewards adds over time. Supports any token — just enter a custom APY. Useful for comparing staking opportunities across different protocols.
💥 Liquidation Price Calculator
solvebar.com/tools/liquidation-calculator
If you trade with leverage, knowing your liquidation price before you open a position is not optional — it is survival. Enter your entry price, leverage, position size, and direction (long or short) to get your exact liquidation price instantly. It supports both cross and isolated margin modes. This is one of the most important tools on this list if you trade futures or perpetuals.
Portfolio Tools
💼 Crypto Portfolio Tracker
solvebar.com/tools/crypto-portfolio
Add your holdings manually — coin, quantity, and average buy price. Live prices update automatically, showing current value, profit or loss, and ROI per asset. No wallet connection required. No account. Everything saves to your browser's local storage only. Your portfolio is visible to nobody but you.
👁️ Crypto Watchlist
solvebar.com/tools/crypto-watchlist
Add any token and set a target price. Live prices refresh automatically, with visual alerts when a coin approaches your target. It persists across sessions without any account. Open it in a browser tab and let it run in the background while you work.
Ethereum Developer Tools
Ξ Wei / Gwei / ETH Converter
solvebar.com/tools/eth-unit-converter
Convert between Wei, Gwei, and ETH instantly. Essential for Solidity developers reading contract return values, DeFi traders checking gas costs, and anyone working with Ethereum at a technical level.
🔗 ABI Decoder / Encoder
solvebar.com/tools/abi-decoder
Paste raw calldata and a function signature to decode the parameters into human-readable form. Know exactly what a transaction is doing before you sign it — not after. Runs entirely in your browser. Your contract data is never uploaded anywhere.
👛 Wallet Age Checker
solvebar.com/tools/wallet-age-checker
Paste any Ethereum wallet address to see its first transaction date, wallet age, and total transaction count. Useful for airdrop eligibility checks, researching whale wallets, doing due diligence on P2P counterparties, and understanding how long a project team's wallets have been active.
The One Thing Every Tool Has in Common
No server ever processes your data.
Gas prices are fetched directly from public APIs in your browser. Calculations happen in browser memory. Portfolio data saves to your local storage — not a database somewhere. Wallet lookups query public blockchain data directly.
Your trade history, your portfolio, your wallet addresses — none of it passes through any server I control.
All 12 Tools in One Place
👉 solvebar.com/category/blockchain
Along with 65 more free tools for developers, image editing, PDF management, finance, and productivity — all built on the same principle.
No signup. No tracking. No ads. Just tools that work.
