Spark opens USDT savings vault on X Layer for OKX customers

Opening

Spark, an on‑chain capital allocation platform, is opening its USDT savings vault to users of the OKX exchange. The vault lives on X Layer, OKX’s Ethereum Layer‑2 network, and offers a 3.5% annual yield.

Key details

• OKX aggregates USDT deposits and routes them to the Spark Savings USDT vault on X Layer.
• Deposits stay in a single on‑chain contract that any X Layer user can access; there is no separate OKX pool.
• The vault’s rate is set at 3.5%, matching Spark’s Ethereum USDT vault.
• Supply cap on X Layer is 750 million USDT with a maximum yield of 6%.
• Liquidity buffer on X Layer is the greater of 10% of deposits or $1 million, capped at $10 million.
• Deposit token on X Layer is USDT0, an omnichain version of Tether’s stablecoin.
• Product is available to eligible OKX users outside the European Economic Area.

Official statement

Sam MacPherson, co‑founder and CEO of Spark, said the partnership combines OKX’s exchange experience, X Layer’s on‑chain environment, and Spark’s capital‑allocation intelligence. Jason Lau, OKX’s chief innovation officer, added that the integration lets USDT holders access a differentiated savings product without typical DeFi onboarding steps.

Additional context

Most of Spark’s USDT holdings are on Ethereum, where the vault holds about $360 million. The X Layer vault is newly created; its supply cap of 750 million USDT is roughly six times the current value secured on the chain. Spark’s Liquidity Layer can move capital to approved venues such as SparkLend, Morpho vaults, and real‑world asset strategies. For each dollar deposited, Spark borrows an equivalent amount of USDS, giving the vault a 1:1 USDS backing.

Confirmed facts

• Spark is launching a USDT savings vault on X Layer for OKX customers.
• The vault’s rate is 3.5% and the supply cap is 750 million USDT.
• Deposits are pooled in a single contract; users do not need to open a separate wallet.
• The product is not offered to users in the European Union or other restricted jurisdictions.
• Risk reviewers note that X Layer’s security depends on its operator, which can upgrade the chain instantly.

Open questions

• Spark has not disclosed the exact rate that will be offered after launch, citing legal restrictions.
• The long‑term security model for X Layer remains under review, with a $5 million outbound transaction limit and a 100% capital‑requirement buffer until further assessment.

Why it matters

The integration allows OKX users to earn on‑chain yield on USDT without needing to manage a private key or use a separate DeFi wallet. It also demonstrates how centralized exchanges can partner with DeFi platforms to provide familiar interfaces while accessing blockchain‑based financial products.

Next steps

Eligible OKX users outside the EU can start using the vault once it is live. Spark and OKX indicated that additional integrations are being considered for the future.

Sources

• The Defiant