Firefish review

Firefish is a Bitcoin-only, peer-to-peer lending platform built around a non-custodial multisig escrow. Founded in 2022 and based in Slovakia, it occupies a distinct niche: it connects individual borrowers and investors directly, and crucially never takes custody of the borrower's Bitcoin.

Instead of a company pool, every loan is collateralized by BTC locked in a 3-of-3 multisig Bitcoin escrow shared between the borrower, the lender, and Firefish. No single party can move the coins unilaterally, and the collateral is never rehypothecated or lent out. Borrowers receive fiat (EUR, CHF, USD) or USDC from the matched investor, and repay in a single bullet payment at maturity.

This makes Firefish one of the few ways to borrow against Bitcoin without surrendering it to a custodian. The trade-offs are that it is Bitcoin-only, loans are fixed-term (3–24 months), and availability depends on investor supply on the other side of the market.

Firefish loans are matched peer-to-peer and secured by an on-chain Bitcoin escrow. After completing KYC, you request a loan specifying amount, term (3–24 months), and the BTC collateral you will post.

The platform matches your request with an investor willing to fund it at an agreed rate. Once matched, your Bitcoin collateral is locked into a 3-of-3 multisig escrow. You hold one key, so the coins cannot be spent without your participation, and Firefish never takes sole custody.

The investor's fiat or USDC is disbursed to you. Throughout the term, a 7-step margin-call system monitors your loan-to-value as the BTC price moves, prompting you to top up collateral if it climbs toward the danger zone (margin calls escalate around 73%, 79%, and 86% LTV). At maturity you repay principal plus interest in one bullet payment, and the multisig releases your full BTC collateral back to you.

Firefish rates are market-driven, set by the investors who fund loans rather than by an algorithm or a single company schedule. Borrowers effectively see a range — our data reflects roughly 5–15% depending on term, loan-to-value, and how much investor capital is competing for deals.

Because it is a marketplace, your rate depends on supply and demand at the moment you post. In periods with plenty of investor capital, well-collateralized short-term loans can price near the low end; thinner markets or higher-LTV, longer-term requests push toward the high end.

To get a better rate, request a conservative LTV (Firefish caps around 40–60%, typically ~50%), choose a shorter term, and post when investor liquidity is strong. Unlike open-ended DeFi or CeFi credit lines, the rate is fixed for the term once you are matched, so you have certainty for the life of the loan.

Firefish's core security advantage is its non-custodial 3-of-3 multisig escrow. Your Bitcoin is locked in a Bitcoin-native multisig in which you hold a key, so neither Firefish nor the investor can unilaterally move or rehypothecate it. This structurally eliminates the custodial-failure risk that sank centralized lenders like Celsius and BlockFi.

The collateral arrangement is verifiable on-chain, and Firefish has undergone independent security reviews of its escrow design. Because the model is peer-to-peer, there is no large company balance sheet commingling your coins with others'.

The residual risks are different from a custodian's. You face counterparty/operational risk around the matching and repayment process, fixed-term liquidity risk (you must repay the bullet payment at maturity or face collateral liquidation), and price risk managed by the 7-step margin-call system. As a younger, niche platform, Firefish also has a shorter track record and smaller market than the incumbents.

Firefish is for Bitcoiners who refuse to hand their coins to a custodian but still want to borrow against them — someone holding BTC who wants EUR, CHF, USD, or USDC for a defined period and is comfortable with a fixed term and a single bullet repayment. The multisig model appeals to self-custody purists who would never use Nexo or YouHodler.

It is not for users who want open-ended, flexible credit lines, who hold collateral other than Bitcoin, who need very large loans on demand, or who want the instant funding and deep liquidity of a large CeFi lender. Investor supply can also limit availability for borrowers.

Firefish earns 7/10 for solving the hardest problem in Bitcoin lending — borrowing without giving up custody — through a clean 3-of-3 multisig escrow with no rehypothecation. It loses points for being Bitcoin-only, fixed-term, and dependent on peer investor liquidity, plus a shorter track record than larger players. Avoid Firefish if you need open-ended credit, non-BTC collateral, or guaranteed instant funding; for those, a CeFi lender or DeFi protocol fits better.