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Blend supply moves XLM or BLUSDC from your margin account into Blend’s testnet lending pool. Blend gives back b-tokens (for example bXLM), which stay in your margin account and count as collateral.
Farm XLM Supply Blend pool page with Supply APY, Borrow APY, Utilization Rate and Total Pool Supply, a My Supply Position chart showing 102.6614 XLM supplied at 1 bXLM = 2.5160 XLM with position value $17.42 and receipt balance 40.8028 bXLM, and a Supply form for 10 XLM showing Network Stellar Testnet, Source 10.0000 borrow, Deposit 102.6614 to 112.6614, APY and projected monthly and yearly earnings, with a Supply XLM to Blend button

The Blend XLM pool page: your supply position on the left, the Supply form on the right with the source and projected earnings. Click the image to zoom.

Supply

1

Open the pool

On Farm → Lending/Single Assets, click XLM or BLUSDC.
2

Enter an amount

On the Supply tab, type an amount or use the % chips. Margin shows what your margin account holds.
3

Check the summary

Source shows how much comes from borrowed funds and how much from your own collateral (borrowed funds are used first). You also see your deposit before → after, the APY and projected earnings.
4

Sign

Click Supply XLM to Blend (or BLUSDC) and approve.

Withdraw

On the Withdraw tab, enter the amount in b-tokens (what Blend burns). The app converts it to the underlying at the live b-rate and shows what you’ll get. A 100% withdrawal re-reads your balance right before sending so nothing is left behind. Click Withdraw … to Margin Account. Withdrawn tokens go back to your margin account, not your wallet. Repaying a loan or transferring to your wallet is a separate step.

Good to know

  • b-tokens grow in value. 1 bXLM is worth more than 1 XLM and keeps rising as Blend borrowers pay interest, so your receipt count is smaller than the amount supplied.
  • Blend’s rates are Blend’s. On testnet they can be extreme. A high supply APY doesn’t guarantee a positive spread after your Vanna borrow rate.
  • Exits can be limited by Blend’s own liquidity.
See Repay and the Blend Controller.