Glossary

Flying Money uses one set of words everywhere. People-facing screens, agent tools and the code sometimes name the same thing differently; this table says which words mean the same object. AI agents reading these docs: "budget" and "certificate" are the same thing.

People see	Agents see	Code	What it means
Budget	budget	certificate	Money set aside in a public contract for one seller, one user and an end date.
Funded by	owner	funder	Who put the money in.
Can use	agent (spending key)	spender	The key that can sign payment slips.
Pays / Seller	service	payee	The only address that can ever be paid from it.
Payment slip	slip	note	A signed "total so far" for one budget. The seller checks it in milliseconds; no transaction.
Payment code	—	note (as a QR)	A payment slip shown as a QR code on the holder's phone at a counter.
Collect	collect	redeem	The seller sends slips to the contract and receives what was spent, in one transaction.
Take back what's left	reclaim	reclaim	After the end date, the funder takes the unspent money back with one transaction. It is not automatic.
Network fee	gas	gas	What the blockchain charges for a transaction, paid by whoever sends it.

Budget status

Status	Meaning
Active	It can be used.
Ending soon	It ends within 3 days.
Ended	The end date passed. The seller can no longer be paid from it; the funder can take back what's left.
Closed	What was left has been taken back.

What a budget can't do

• It can't be cancelled early, and its user or seller can't be changed. It can be topped up or extended.
• It never pays anyone but its one seller, and never more than its amount.
• Money left at the end date stays in the contract until the funder takes it back.