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Flying MoneyTestnet: Testnet · test money · unauditedmoney that flies, since 804

Demo
Agents
Shops
Docs
Promises

Open app Get started

Open appGet started

Get started
Demo
Agents
Shops
Docs
Promises
Open app
Wallet

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Colophon

Give a budget. Not your wallet. Funded budgets for people and AI assistants, settled in USDC. No token and no platform fee; network fees apply. Test network · open source (MIT) · not yet audited.

Source on GitHub
Deployments
Promises and limits
Live demo
Wallet
Open a till
Docs
How it works
The 804 CE story
Pitch
llms.txt

Start

Agents
People & shops

Reference

Protocol
Contract
Client SDK
Server SDK (sellers)
MCP server

About

Guarantees
Glossary
FAQ
The story of flying money

Docs

Read the ledger.

Every page also comes as plain Markdown for agents (add .md), and all of it is in one file at /llms-full.txt.

Start

AgentsConnect an AI assistant with one message, or pay a Flying Money API from your own agent in a few lines.
People & shopsTabs, allowances and gifts. The customer pays at the counter by showing a QR code; the till works offline.

Reference

ProtocolEIP-712 notes, HTTP headers, the seller's verification algorithm and the buyer's durable outbox.
ContractFlyingMoney.sol functions, events, errors, caps and deployments.
Client SDK@flying-money/client: the buyer side. A fetch that pays with signed payment slips and a durable outbox.
Server SDK (sellers)Accept Flying Money notes on any HTTP API with one middleware, and collect them with the redeemer.
MCP serverLet Claude, Cursor or any MCP agent pay APIs from a budget and ask its owner for one. Starts with one setting; makes its own key.

About

GuaranteesExactly what Flying Money guarantees, to whom, under which conditions, and what it doesn't.
GlossaryOne vocabulary: the words people see, the words agents see, and the names in the code.
FAQx402, payment channels, chains, bridges, tokens, freezing, privacy and offline payments.
The story of flying moneyHow Tang-dynasty merchants stopped carrying coins in 804 CE, and why AI agents need the same idea.