Sui wants to make Bitcoin productive without asking holders to sell it. Its Hashi project has opened a testnet for BTC-backed finance, adding another way to use crypto as capital. A payments app entering its own test asks what happens at the opposite end of that journey: when the holder needs spendable fiat in an ordinary bank account.

At Remittix, 1,000 existing RTX holders have been invited to test PayFi, designed to take supported crypto into compatible fiat bank payouts. The wallet and Markets product can keep customers active before they need to cash out. If Remittix wins the final step for people who hold and earn in crypto, the opportunity could extend to a far broader audience than its first testers suggest.

Sui’s Bitcoin Collateral Push: What Is Hashi Testing?

Sui announced a live Hashi testnet for Bitcoin-backed financial applications. Developers and institutions can test ways of using BTC as collateral while building lending and other products ahead of a wider rollout.

The use case is attractive because Bitcoin holders may want to access liquidity without disposing of their BTC. Sui’s developer ecosystem could benefit if those applications draw substantial collateral and activity. SUI traded near $1.18 in early October, so investors will look for meaningful adoption beyond the initial test environment.