Rerouted (renamed, verified). The GitHub user or repository was renamed. The tag is still there, at the new name. The Lamdera package server serves a copy recovered from https://github.com/IntrepidShape/elm-web3.
What we checked: The repo moved to github.com/IntrepidShape/elm-web3 and tag 1.0.0 is there; its commit 9d919244f65e is from 2026-05-09 11:48 UTC, before the version was published (2026-05-09 11:58 UTC); elm.json is byte-identical to package.elm-lang.org's; the exposed modules match docs.json; the zip's SHA-1 is not the published one (GitHub's zip no longer comes out byte for byte the same), so the contents were checked instead.
The Lamdera compiler uses this copy and prints a one-line notice saying so. elm itself fails to download this version.
Details · package.elm-lang.org's zip: https://github.com/intrepidshape/elm-web3/zipball/1.0.0/
ETH / ERC-20 unit conversion — pure Elm, no JS required.
formatEther (BigInt.fromInt 1500000000000000000) == "1.5"
parseEther "1.5" == Just <1500000000000000000>Parse a human-readable ETH string to Wei. Returns Nothing for invalid input, non-numeric strings, or negative values.
parseEther "1" == Just <10^18>
parseEther "1.5" == Just <1.5×10^18>
parseEther "0.000000000000000001" == Just (BigInt.fromInt 1)
parseEther "not-a-number" == Nothing
parseEther "-1" == NothingConvert a token amount (in its smallest unit) to a human-readable string for a token with the given number of decimal places. Trailing zeros are trimmed.
formatUnits 6 (BigInt.fromInt 1500000) == "1.5" -- USDC
formatUnits 8 (BigInt.fromInt 100000000) == "1" -- WBTCParse a human-readable token amount to its smallest unit, given the token's decimal count. Returns Nothing for invalid or negative input.
parseUnits 6 "1.5" == Just (BigInt.fromInt 1500000) -- USDC
parseUnits 6 "0" == Just BigInt.zero
parseUnits 6 "-1" == Nothing
Convert Wei to a human-readable ETH string with up to 18 significant decimal places. Trailing zeros are trimmed.