Stale-approval exposure on deprecated router
Falcon Finance's assessment for RD-F-168 — scored green on the v1.7.0 rubric. The evidence below is the curator's reasoning for this score.
Evidence summary #
No deprecated router contracts with active user approvals identified. USDf and sUSDf proxies maintain stable proxy addresses — user approvals survive any implementation upgrade without pointing to deprecated contracts.
Detail #
No prior router or pool contracts deprecated. USDf proxy (0xFa2B947…) and sUSDf proxy (0xc8CF6D…) are both stable addresses — any implementation upgrade does not change the proxy address that users approve. No deprecated contracts found with residual active approvals.
Sources #
- EtherscanUSDf proxy events — no upgrades in last 30 dayshttps://etherscan.io/token/0xFa2B947eEc368f42195f24F36d2aF29f7c24CeC2#eventsretrieved 2026-05-12
Methodology #
Count the number of active user approvals (ERC-20 `allowance`) to deprecated router or protocol contracts.
See the full factor methodology and distribution across all protocols →