FixedFloat is a non-custodial cryptocurrency swap service that launched in 2018 and operates as a one-shot coin converter rather than a traditional exchange. The platform requires no account, no email and no identity verification for typical orders, and it does not hold user balances at rest. Each swap generates a one-time deposit address: the user sends the source asset to that address, FixedFloat performs the conversion via its own liquidity sources, and the destination asset is sent directly to the user-supplied receiving address. The same flow is available through the website at fixedfloat.com, the ff.io short alias, the FixedFloat mobile apps for iOS and Android, and the FixedFloatBot Telegram bot.

Coverage spans more than one hundred cryptocurrencies, including Bitcoin, Ethereum, Binance Coin, Solana, Litecoin, Dogecoin, Monero and the major USDT and USDC variants across Ethereum, Tron, Solana, Arbitrum, Optimism, Base and zkSync. Pricing is rate-type rather than maker and taker: a Fixed-rate order locks the exchange ratio for a 10-minute window at a 1% service fee, so the user knows the destination amount up front; a Float-rate order tracks the market between deposit and confirmation at a 0.5% service fee, accepting some uncertainty in exchange for a lower price. Network fees on both sides of the swap apply in addition to the service fee.

FixedFloat was breached in February 2024 in a hot wallet exploit that drained around 26 million US dollars in BTC and ETH, followed by a smaller incident in March 2024 of roughly 2.8 million US dollars. The service resumed in late May and early June 2024 after a security overhaul that introduced air-gapped multi-signature settlement for large fixed-rate orders, alongside an integrated Lightning Network wallet in the mobile apps and an updated anti-money-laundering policy. The AML policy can place orders flagged by transaction monitoring on hold pending documentation (sometimes referred to as shotgun KYC), even though the default flow remains no-KYC. No further hacks have been reported since April 2024, and the public REST API at fixedfloat.com/api remains available for partners building swap flows on top of the service.