Coupon Token

CouponToken (CT) is the floating-yield ERC-20 token with built-in interest tracking and post-expiry treasury sweep.

Source: src/fira_bonding/core/YieldContracts/CouponToken.sol

Token details

Property	Value
Standard	ERC-20 (FiraERC20)
Symbol	CT
Decimals	6
Permit	No

Key view functions

Function	Returns
bcIndexStored()	Last cached BC index
bcIndexCurrent()	Current BC index (may trigger update)
isExpired()	Whether BT/CT have expired
FW()	Associated FW token address
BT()	Associated BT token address
getPostExpiryData()	Snapshot data from first post-expiry interaction

Interest tracking

Interest is distributed on every transfer via _beforeTokenTransfer. Users claim via redeemDueInterestAndRewards. The interestFeeRate is deducted at claim time.

Related pages

• CouponToken (Protocol Contract)

• Coupon Token (Feature)