Settle LinkPayPal sandbox

PayPal sandbox build for the PayPal AI Hackathon: no real money moves.

Paid through PayPal checkout, straight to the seller's own account

One link to settle a deal made in a DM.

Strangers who agree a sale in a chat get stuck on who goes first. Settle Link turns the chat into one card both people confirm, paid through PayPal checkout instead of Friends and Family or a bank transfer, and keeps the record from the first message to a dispute.

Judge mode sets up eight demo deals, one at each stage plus one where the two readers disagree, with buyer and seller side by side. Nothing reaches PayPal.

Deal card

Example

Item
Trek Domane AL 2, 54cm
“yes, Trek Domane AL 2, 54cm, barely used”
Code and the AI reader agree
Price
$320.00
“ok $320, I can post it tracked by Friday”
Code and the AI reader agree
Delivery
Post, tracked
“I can post it tracked by Friday”
Code and the AI reader agree
a41f09c2e7… Seller Buyer

How a deal goes

  1. 1

    Paste the chat

    Settle Link reads a redacted copy, finds the item, price and delivery, and explains anything risky, like being asked to pay as Friends and Family.

  2. 2

    Both confirm one card

    Buyer and seller each confirm the same card. It is locked by its fingerprint; any change clears both confirmations.

  3. 3

    Pay through PayPal checkout

    The buyer pays the card's exact total to the seller's own PayPal account. Settle Link never holds the money.

  4. 4

    Ship when the checks pass, or meet up

    Payment counts only when a verified PayPal webhook and a fresh read of the order agree. A new address after payment holds the parcel. For a meet-up, PayPal holds the money until the buyer checks the item and scans the seller's code.

  5. 5

    Answer a dispute from the record

    The case file, honest advice and an evidence pack come from what happened. The seller approves the exact response; PayPal decides.

ProofHow often the checks are right, with the counts behind every number.See the numbers →Try to fool itRun ten attacks through the real server code: fake payment emails, forged webhooks, cards edited after confirming.Run the attacks →

Settle Link explains warnings; it never approves a payment or a shipment. It never says a deal is protected: it shows which of PayPal's published requirements the record meets, and PayPal decides eligibility and disputes.