Mail.fun

Mail.fun is the decentralized marketplace layer of the SolMail ecosystem. It enables users to buy, sell, trade, and link Web3 usernames (such as [e-mail]) as NFTs on Solana. Mail.fun transforms usernames into programmable digital assets, turning identity into an economy.

Mail.fun extends SolMail’s identity layer by:

• Allowing username ownership and transfer via NFT standards.

• Creating a marketplace for usernames, newsletters, and creator subscriptions.

• Enabling identity-linked assets, where a username can be directly bound to a SolMail inbox, wallet, or dApp login.

Background & Problem

In traditional Web2 ecosystems:

• Email IDs and usernames are owned by centralized providers (Google, Twitter, etc.).

• Transfers of identity (usernames, domains) are restricted and often non-permissible.

• No secondary market exists for digital identity assets.

Mail.fun solves this by leveraging Solana’s NFT and DeFi infrastructure, making usernames fully user-owned, tradable, and composable.

Core Features

Username NFTs

• Each SolMail username (e.g., [e-mail]) is minted as an NFT on Solana.

• Ownership of the NFT = control over the username.

• NFT metadata links the username to:

  • SolMail inbox

  • Wallet address

  • Profile details

Marketplace

• Built-in auction system for trading usernames.

• Users can:

  • List usernames for fixed price or auction.

  • Bid and purchase desired usernames.

  • Bundle usernames with SolMail accounts for premium valuation.

Linking & Identity

• Multiple usernames can be linked to a single SolMail inbox.

• Supports aliasing for traders, creators, or businesses.

• Marketplace supports “identity bundles” (e.g., a set of related usernames).

Architecture Overview

Components

1. Frontend (Web App / dApp)

   • React-based interface for browsing, bidding, and linking usernames.

2. Backend / Indexer

   • Off-chain service for querying NFT ownership, auction status, and historical trades.

3. Smart Contracts

   • Registry Program: Maintains mapping of usernames → NFTs → inboxes.

   • Marketplace Program: Handles listing, bidding, auctions, and transfers.

   • Treasury Program: Collects trading fees (in $MAIL or $SOL).

4. Storage

   • Metadata stored on Arweave for persistence and immutability.

Example Flow

Alice wants to buy [e-mail]

• Alice visits Mail.fun marketplace.

• Sees [e-mail] is available.

• Places a bid in $MAIL/ $Sol.

• Auction closes → Alice wins.

• [e-mail] NFT is transferred to Alice’s wallet.

• Alice links the username to her SolMail inbox.