Repay Fixed Rate

Repay fixed-rate debt using any input token, with automatic BT acquisition via AMM swap (pre-expiry) or BT+CT minting (post-expiry).

Key references: ActionBorrow.repay.

Details

• Goal: Repay debt using an input token; router converts to BT as needed.
• Preconditions:

  • Existing borrow: else "AB: no borrow".
  • tokensToRepay must be ≤ current debt: else "AB: repay too much".
  • Input token approval to router.
• Expiry handling:

  • Pre-expiry: Input token → FW (mint) → BT (AMM swap via FiraMarket). Repay, refund excess BT.
  • Post-expiry: Input token → FW (mint to CT contract) → CT.mintBC produces BT + CT. Only BT is used for repayment. CT is minted but NOT burned — it stays in the router with zero economic value.

Views and events

Views

• Lending: getUserPosition (pre/post), position(id, user).
• Market: isExpired().
• FW: previewDeposit, bcIndexStored() for estimation on expired paths.

Events

• Lending: EventsLib.Repay (assets, shares), possibly EventsLib.AccrueInterest.
• Router/Misc: MintFwFromToken, MintBcFromFw when conversions occur.