Events & Indexing

Event tracking and position measurement across Fira markets, covering the 8 role buckets and their on-chain event sources.

Fira tracks user positions across 8 role buckets using weekly time-weighted average (TWAP) exposures. Positions are piecewise-constant, updated on relevant on-chain events. This section documents the event-to-role mapping and position share formulas for analytics and integrations.

Positions are piecewise-constant between events. The indexer must track each event to maintain an accurate TWAP of user exposure per role bucket over each epoch.

Role buckets

Bucket	Full name	Market
BFR	Borrow Fixed Rate	Fixed Rate
BT	Held BT	Fixed Rate
CT	Coupon Token holders	Fixed Rate
LP	Liquidity Providers	Fixed Rate
VRB	Variable Rate Borrow	Variable Rate
VRL	Variable Rate Lend	Variable Rate
USLC	USL Collateral	USL Migrator
USLL	USL Loan	USL Migrator

Source contracts

Contract	Events defined in	Emitted by
LendingMarket	lib/fira-lending-market/src/libraries/EventsLib.sol	LendingMarket.sol
BondToken	ERC20 events via FiraERC20	BondToken.sol
CouponToken	Custom + ERC20 events	CouponToken.sol
FiraMarket	src/interfaces/IPMarket.sol	FiraMarket.sol
SisuVault	ERC4626 Deposit/Withdraw	SisuVault.sol

Pages

• Event Table — Corrected event-to-role mapping with issue analysis

• Position Measurement — Per-role position share formulas and function calls