Troubleshooting

“Signer Not Authorized”

Cause: stale order data. Fix: fetch fresh order data right before fillOrder().

“Signature Mismatch”

Cause: you changed one or more order fields. Fix: pass API fields verbatim (incl. isLong, strikes, price, etc.).

“Insufficient Allowance”

Cause: USDC not approved. Fix: check allowance(owner, OPTION_BOOK); call approve() if needed.

“Transfer Amount Exceeds Balance”

Cause: rounding or price changed. Fix: always round down contracts (Math.floor(... * 1e6)).

“Position Not Showing”

Cause: indexer not caught up. Fix: call /update, wait ~15s, then refetch /user/{addr}/positions.