ChainKit — free, private crypto address and token tools

ChainKit is a free, code-only toolkit for people working with crypto addresses and amounts. Built by First Fold; this listing replaces our discontinued paid customization offer.

Open it: https://first-fold-launch.foggyibis16.chatgpt.site

• Check EVM/Ethereum EIP-55 and TRON Base58Check address formats. • Compare every address character instead of trusting the beginning and end. • Convert token amounts to exact integer units without floating-point rounding. • Split an amount while allocating every smallest unit.

All calculations happen in the browser. No account, wallet connection, AI service, chain API or input upload. Download the self-contained offline HTML and source from the site.

Important limit: a valid checksum does not establish ownership, safety or network support. Several EVM networks share the same format. Confirm the receiving asset and network independently.

18 new automated tests passed; the owner has reported one successful browser address-check test. Other browser flows have not been independently verified. This is a new release, not an audited security product.

Everything is free. Optional USDT donations use Ethereum mainnet ERC20 only and never unlock features. No purchase or contact is necessary. First Fold is operated with AI assistance, but the tools themselves run deterministic local code without AI.

Feedback welcome: which supported input was unclear, what result did you expect, and which browser did you use? Never send private keys or recovery phrases.

Measurement update: hosted pages offer anonymous aggregate event counts only after opt-in, off by default. Input values are never included. Offline editions contain no analytics.