Overview
JamOnBread is an NFT marketplace where people buy, sell and make offers on digital collectibles using a crypto wallet. Collectors use it to browse collections, compare prices and shop listings gathered from more than one marketplace, a bit like a price-comparison site where you can also check out. Sellers can move existing listings from other marketplaces onto JamOnBread with a single wallet signature1.
JamOnBread runs on Cardano. Prices show in ADA, and each sale settles on the blockchain rather than through a company account2. The marketplace is the trading name of GRANDMONTS DIGITAL ASSETS s.r.o., a company registered in Brno, Czech Republic2. JamOnBread's revenue-sharing smart contract, a self-running program that splits a sale's fee between the marketplaces and referrers involved, was built through a Project Catalyst proposal, funded by the Cardano community's grant program and listed as complete3.
Key Features
- More of the market in one place. JamOnBread shows listings held by other marketplaces, such as Wayup, next to its own, and a small marketplace icon marks where each listing lives2.
- Switch marketplaces without starting over. The Migrate page cancels a JPG Store or Wayup listing and relists the same NFT on JamOnBread in one signature, and lets sellers list many NFTs in bulk1.
- Prices and trends before you buy. Collection pages show the floor price (the cheapest listed item in a collection), trading volume and holder numbers, and an activity feed tracks buys, listings and offers4.
- Get paid for bringing in traders. A JamOnBread referral link, created with one wallet signature, earns its owner a share of the marketplace fee on every trade it brings, paid out automatically on the blockchain5.
- Creators keep their royalties. When a collection's smart contract sets a royalty, a cut of each resale that goes back to the original artist, the creator receives it on sales through the marketplace2.
What to Expect
For collectors, the site feels like an online shop. You connect a wallet, browse featured and trending collections, open an item and either buy it or make an offer5. Each purchase or offer is a transaction you approve in your own wallet, and JamOnBread's fees are shown before you sign2. JamOnBread's own sales carry a 2.5% platform fee, but sales under 40 ADA can pay a fixed minimum instead, so the fee is never less than about 0.21 ADA and takes a bigger share of a cheap item's price. Buying an item listed on another marketplace costs a flat 1 ADA for building the transaction, on top of that marketplace's own fee2.
For sellers, the Migrate page is the main stop. After connecting a wallet, it shows every NFT you hold, your active listings and any older listings that are ready to move across1. From there you can list several items in one go instead of one by one1.
For developers and other marketplaces, the Catalyst-funded contract is public in the JamOnBread contract repository under the Apache 2.0 license, which lets anyone copy, change and share the code free of charge. It is written in Aiken, a programming language for Cardano smart contracts. The design splits a 2.5% fee between JamOnBread, the marketplace where an item was listed, the marketplace where it sold and any referrers, and the repository invites other marketplaces to use the contract in their own markets. Its code was last changed in March 20246.
If you want to compare JamOnBread with alternatives, the directory lists other NFT marketplaces side by side.
