LND Update Adds Guardrail Against Extreme Bitcoin Fee Estimates

The latest LND release candidate, version 0.21.5, introduces a safeguard against unrealistic external Bitcoin fee estimates that could lead to overpaying on transactions. The update, noted in the October 22 development release, sets a ceiling on values received through external fee APIs, preventing the wallet from blindly trusting inflated fee data. This change addresses a quiet but real risk for Lightning Network node operators who rely on third-party fee estimation services. By capping fee inputs, LND reduces the chance of users paying excessive transaction fees during periods of fee market volatility or API misreporting. The release also includes fixes to other node operations, improving overall reliability. For node runners, this update underscores the importance of fee management in maintaining cost efficiency. As Bitcoin's fee environment evolves, such guardrails help protect users from unforeseen expenses.