Pay with a Borro credit line

01Buy CREDIT on Uniswap, from the owner wallet

CREDIT isn't sold in Borro's app. It trades against USDG in a Uniswap v3 pool on Robinhood Chain, the pool Borro prices it from.

1. Go to app.uniswap.org, connect the owner wallet and pick Robinhood Chain.
2. Swap from USDG to CREDIT. Paste the token's address, since it isn't on Uniswap's default list:

0xE33322DA1380e61E5Ae5DfB21e7f62924c73004C

Check the address ends in …004C before importing it: tokens with the same name exist. About 1 USDG of CREDIT is plenty for testing. The swap needs a USDG approval, then the swap itself, and a little BNB for gas. The pool's fee is 1%. CREDIT is a third-party token and its price moves.

02Open the line on Borro

1. Go to borro.markets/app with the owner wallet, choose Borrow, then the AI credit market (CREDIT).
2. Post the CREDIT as collateral, and set the amount to borrow now to 0. Anything borrowed while opening goes to the owner wallet and uses up the line's room.
3. Set Agent to the agent wallet's address.
4. Tick Let the agent pay its x402 bills. This lets the agent borrow into its own wallet to pay. Leave the other addresses alone: every address on that list can receive borrowed USDG.
5. Set a small ceiling (the most the line can owe) and daily limit. Keep Borro's default target LTV and its keeper protection on, which guards the line if CREDIT's price falls.
6. Let the agent borrow its own gas is optional: it lets the agent turn borrowed USDG into BNB. Sending the agent a little BNB is simpler.

Confirm and sign. Note the line's address, which Borro calls its account: the agent passes it to Borro's tools.

03Give the agent wallet gas

Send it a little BNB, about 0.0002, for the borrow transactions. A borrow costs about 0.00002 BNB on Robinhood Chain. The payment itself costs it nothing: Autonomo pays that gas.

01Call the API and get the price

Call the API without a payment. It answers 402, with a PAYMENT-REQUIRED header listing what it accepts. Keep that header as it is. USDG is listed first, and that's the option Borro pays.

02Ask Borro to prepare the payment

Call credit_bill on Borro's MCP server. max_usdg is the most the agent will pay for this call, so set it a little above the API's price.

{
  "wallet": "<the agent's wallet>",
  "account": "<the credit line's account>",
  "payment_required": "<the PAYMENT-REQUIRED header>",
  "max_usdg": "0.05"
}

It returns the EIP-3009 typed data to sign. If the wallet doesn't hold enough USDG, it also returns one borrow transaction: send that first, and wait until the borrowed USDG is in the wallet.

03Sign

Sign the typed data with the agent's wallet. Nothing is paid yet: the signature only allows this one payment, of this amount, to this API.

04Get the payment header

Call credit_bill_header. It returns the header's name and value.

{
  "payment_required": "<the PAYMENT-REQUIRED header>",
  "authorization": "<from credit_bill>",
  "signature": "<your signature>"
}

05Call the API again

Send the same request with that header. The API checks the payment, answers 200 with the result, and the USDG is settled on-chain. Aut pays the gas.