There is no account system, no cookie, no tracking pixel, and no analytics script on this site. Most of what you type here never leaves your machine at all.
What runs locally
Unit conversions, address validation, checksums, and hashing execute entirely in your browser. Addresses and amounts you paste into those tools are not transmitted anywhere. Several pages work offline once loaded.
What the servers see
Live-data tools (gas prices, mempool fees, USD prices, token lookups) call this site's own API endpoints, which proxy public blockchain data. Those requests carry whatever HTTP inherently carries, such as your IP address, and nothing else: no identifiers, no stored profiles, no user database on our side. One exception worth naming: a token lookup necessarily includes the contract address you asked about.
Upstream data providers (public RPC nodes, mempool.space, CryptoCompare, Coinbase) receive requests from our servers, not from your browser, so your IP is not exposed to them. Hosting is provided by Vercel, which processes standard request logs as part of operating the platform.
What is stored in your browser
One localStorage key remembers the motion-effects toggle. That is the complete list. Clearing site data removes it.
Changes
If any of the above ever changes, this page changes with it, and the sitewide changelog will say so.