Built for Marketplace sellers & buyers

Sell on Facebook Marketplace without getting scammed.

Both buyer and seller verify by phone and sign one tamper-proof receipt. No more screenshots, no more 'never received it,' no more chargeback fraud.

Create your first receipt — freeVerify a receipt
No credit cardSet up in 30 secondsNo app to download

The trust problem on Marketplace

You've probably been here before — or worried about it happening.

Chargeback fraud

Buyer pays, takes the item, then claims it never arrived. PayPal/Zelle sides with them. You're out the item AND the money.

Fake screenshots

Scammers fake payment confirmations in Photoshop. By the time you realize, they're gone with your item.

Disputes with no proof

Messenger chats can be deleted. Without verified evidence, it's your word against theirs.

How it works

3 steps. 30 seconds. Tamper-proof.

1

Create the receipt

Type what you're selling on Marketplace and the price. We generate a unique link.

2

Share & both verify by phone

Send the link via Messenger, SMS, or QR code. Both parties verify their real phone number.

3

Done. You're both covered.

The receipt is now cryptographically signed evidence. Nobody can claim the deal didn't happen.

Perfect for any Marketplace deal

iPhones & laptops
Furniture & couches
Game consoles
Bikes & scooters
Designer items
Power tools
TVs & monitors
Anything over $50
“Sold a PS5 last month. Buyer tried to claim it was DOA two days later. I showed him the Authryn receipt — both phones verified, both signatures — and he dropped it. Saved me $500.”
Anonymous seller
Facebook Marketplace, Austin TX

Frequently asked

Does this replace Facebook Marketplace?
No. You still list and chat on Marketplace like normal. Authryn just adds a verified, tamper-proof receipt on top — so neither side can deny the deal happened or what was agreed.
What if the buyer refuses to verify?
That's a massive red flag — and exactly why you'd want to walk away. Honest buyers have nothing to lose by verifying their phone for 10 seconds.
Is this legally binding?
An Authryn receipt is signed evidence with verified phone numbers and a cryptographic hash. It's been useful in small-claims disputes and PayPal/Zelle chargeback investigations. We can't promise outcomes — but it's far better than a screenshot.
Do I need to download an app?
No. Authryn works entirely in your browser, on any phone. Your buyer doesn't need an account either — they just click your link and verify by SMS.
How much does it cost?
Your first receipt is free. After that, individual receipts are $1. Buying a 10-pack drops it to $0.50/receipt.

Ready to sell on Marketplace without fear?

Your first receipt is free. No card, no commitment, no app. Just trust — built in 30 seconds.

Get my free receipt