Borrow USDC Against Bitcoin Without Selling: Zest Collateral Vault + Xverse

Bitcoin holders face a paradox. The asset they refuse to sell is the same one they need liquidity from. Selling triggers a taxable event in most jurisdictions and closes the position entirely. Not selling means sitting on value you cannot use.

Custodial loan desks solved this years ago. You send coins to someone else, they give you dollars, and you trust them to give the coins back. For holders who left exchanges specifically to control their own keys, that tradeoff undoes the entire point.

A collateral vault on a self-custodial path keeps the Bitcoin side under your keys. You connect. You sign. You do not hand the stack to a desk. That is the premise behind the Zest collateral vault: lock native BTC, borrow USDC on Ethereum, keep the long position.

What this flow is

The Zest collateral vault locks native BTC and opens debt as USDC on Ethereum. Stacks is the rail that ties the vault together. Xverse is the exclusive BTC partner for the Bitcoin side of the flow: you connect Xverse for every Bitcoin-side signature. Zest owns and operates the vault product.

This is a specific partner integration with its own flow, separate from Xverse in-app Borrow on Starknet. Different protocol, different rail, different trust assumptions. Live rates, limits, and health parameters are set by Zest and shown in their interface.

How it works

The flow has four stages: connect, lock, authorize, and borrow. Each one involves signatures on both the Bitcoin and Ethereum sides.

Connect

Open the Zest collateral vault flow at btc-collateral-vaults.zestprotocol.com. Connect Xverse for the Bitcoin side. Connect an ETH-compatible option for the Ethereum side. Both stay under your control.

Lock native BTC

Deposit native BTC into the vault. Wait for confirmations (typically six). Then activate the vault on Ethereum, which registers the locked BTC so debt can open against it.

You are locking native bitcoin here. Not wrapping it into a synthetic token. Not bridging it to another chain. The BTC stays as BTC.

Authorize vault controls

Sign veto approvals on the Bitcoin side. These block unauthorized spend against the locked BTC. On Ethereum, mint the collateral representation the vault uses for the debt side. When activation finishes, you land on the vault dashboard where health, borrow actions, and repay paths show up in real time.

These steps define what the vault can and cannot do. You authorize the boundaries. You keep the ability to block what falls outside them.

Borrow USDC

Borrow USDC on Ethereum against the native BTC locked in the vault. On the Bitcoin side, approve collateral use and pre-sign staged liquidation transactions. Those cover only as much as needed to restore health if the position deteriorates. Sign recovery approvals for the path where BTC is repaid or released when you clear the debt. Then confirm on Ethereum that the Bitcoin-side work is done, and receive USDC into your ETH address.

Result: debt on Ethereum against native BTC in a Zest collateral vault. Keys for the BTC side stayed with you in Xverse through every step.

Who this is for

Conviction holders who need stables without disposing BTC. You believe in the long position. You still need dollar-like liquidity for life, operations, or a timed opportunity.

It is also for self-custodial power users comparing vault rails to custodial bitcoin loan desks. The contrast is structural: custodial desks hold coins or require a deposit. This flow keeps the Bitcoin side under your keys through Xverse. Smart-contract and protocol risk still exist. Custody risk is structurally different.

What Zest Protocol is

Zest Protocol is a Bitcoin-native lending platform. It launched on Stacks as a decentralized lending and borrowing market, then expanded to Bitcoin L1 with the collateral vaults described in this post. The core design is trust-minimized: holders lock native BTC in L1 vaults and borrow assets like USDC on EVM chains without wrapping or bridging.

The protocol's track record is specific. Over $100M in peak total value locked. More than 1,500 liquidations processed with zero bad debt. Liquidation mechanics are where lending protocols tend to break. A protocol that has executed 1,500 liquidations cleanly has stress-tested the one part of the system that most protocols hope they never need.

Who backed Zest Protocol

Zest raised $3.5M in early funding led by Tim Draper, the venture capitalist behind early bets on Bitcoin, Tesla, and Skype. YZi Labs (formerly Binance Labs) invested as a strategic backer. Trust Machines, a Bitcoin L2 infrastructure builder, and Flow Traders, one of the largest global liquidity providers, also participated. Muneeb Ali, co-founder of Stacks, backed the project as well.

The capital came from investors who build and trade Bitcoin infrastructure, not generalist crypto funds rotating through narratives. Tim Draper in particular has been publicly vocal about Bitcoin conviction since buying seized Silk Road BTC at U.S. Marshals auction in 2014. His backing signals alignment with the thesis that Bitcoin holders should be able to use their BTC without selling it.

Risks

Collateralized borrowing carries real risk, and this flow is no exception.

Smart-contract risk exists on the Stacks and Ethereum sides. Protocol risk exists. Liquidation risk exists if the position loses health. If BTC drops far enough relative to your borrowed amount, the vault can liquidate part of your collateral to restore the health ratio. The staged liquidation transactions you pre-signed during setup are the mechanism.

Size the debt so you can absorb a drawdown without getting forced out of the bitcoin you meant to keep. Plan a repayment path before you borrow. Live parameters for rates, limits, and health come from the Zest flow UI and from Zest's terms.

This is education, not financial advice and not tax advice. Rules vary by jurisdiction. Talk to a professional before you size debt against a long-term Bitcoin position.

Where Xverse fits

Xverse is the exclusive BTC partner for the Zest collateral vault flow. Every Bitcoin-side signature routes through Xverse. Your keys stay on your device through connect, lock, authorize, and borrow.

If you already hold BTC with Xverse, the infrastructure is what you are already used to. Same self-custodial model. Same signing experience. The Zest vault adds the ability to borrow against that BTC without selling it.

Download Xverse to connect to the Zest collateral vault and borrow USDC against your Bitcoin.

FAQ

Can I borrow USDC against Bitcoin without selling?

Yes. The Zest collateral vault locks native BTC and opens debt as USDC on Ethereum. You are not selling the Bitcoin to get stables. The BTC stays locked while the debt sits on Ethereum. Live parameters for rates, limits, and health come from the Zest flow and their terms.

Is this an Xverse vault?

No. Zest owns and operates the collateral vault. Xverse is the exclusive BTC partner, meaning you connect Xverse and sign Bitcoin-side steps through it. The exclusive launch partnership is between Xverse and Zest.

How is this different from Xverse Borrow on Starknet?

Different protocol, different rail. In-app Borrow on Starknet is a separate product with its own trust assumptions. The Zest collateral vault uses native BTC locked onchain with USDC out on Ethereum. The two are not interchangeable.

What happens if Bitcoin drops significantly?

If the vault's health ratio falls below the threshold, staged liquidation transactions you pre-signed during setup can execute to restore collateral health. Size your debt conservatively and monitor health in the Zest dashboard. The vault's parameters, thresholds, and liquidation mechanics are governed by Zest's terms.

What is Zest Protocol and who backs it?

Zest Protocol is a Bitcoin-native lending platform built on Stacks and expanded to Bitcoin L1 with collateral vaults. It has processed over $100M in peak TVL and more than 1,500 liquidations with zero bad debt. The $3.5M funding round was led by Tim Draper, with participation from YZi Labs (formerly Binance Labs), Trust Machines, Flow Traders, and Muneeb Ali (co-founder of Stacks).