Latest Release

This release introduces updated default mint fees and several bug fixes across both the mint and wallet.
Default Fees
New mints now use a default fee of 100 ppk. This value can be changed via the .env parameter:
MINT_INPUT_FEE_PPK=100
Recap: How Cashu fees work
Fees in Cashu are based on the number of inputs in a transaction (see NUT-02). Each proof counted as an input contributes linearly to total fees. A fee of 100 ppk means 100 parts per thousand inputs, rounded up. In other words, roughly 0.1 base units per input, rounded up to the nearest integer.
Example:

For a sat keyset, 5 inputs incur 0.5 sat fee, rounded up to 1 sat.
Any transaction with up to 10 inputs costs 1 sat, 11 to 20 inputs cost 2 sats, and so on.
For usd keysets, this corresponds to 1 cent per 10 inputs.

Fees are designed to stay low to maintain a smooth user experience while still discouraging abuse. All mints are encouraged to enable fees for protection.
Fixes

Mint now returns a clean error for pending blinded outputs (code 10002). A dedicated error code for pending outputs will be introduced soon to distinguish this case from already-signed outputs.
Strike backend now applies USDT fees correctly.
Wallet updates keyset fee settings when they change.
Mint now tracks fees accurately across multiple keysets.

What's Changed

Fix blind message already signed error by @callebtc in https://github.com/cashubtc/nutshell/pull/828
Mint: StrikeBackend handle USDT fees by @callebtc in https://github.com/cashubtc/nutshell/pull/829
gRPC interface: description of settings by @callebtc in https://github.com/cashubtc/nutshell/pull/823
Wallet fix: update keyset fees on load_mint() by @callebtc in https://github.com/cashubtc/nutshell/pull/830
Mint: turn on fees by default by @callebtc in https://github.com/cashubtc/nutshell/pull/831
fix: increment fees for correct keysets by @lollerfirst in https://github.com/cashubtc/nutshell/pull/825
bump to 0.18.2 by @callebtc in https://github.com/cashubtc/nutshell/pull/832
bump to 0.18.2 again by @callebtc in https://github.com/cashubtc/nutshell/pull/834
revert error message change from #828 by @callebtc in https://github.com/cashubtc/nutshell/pull/835

Full Changelog: https://github.com/cashubtc/nutshell/compare/0.18.1...0.18.2