# MetaPlace – NFT Marketplace

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## MetaPlace — NFT Marketplace

### Overview

**MetaPlace** is the NFT marketplace of the Meta Whale ecosystem — a universal platform for trading all types of digital assets within a single contract space. Educational certificates, course programs, referral system slots and levels, as well as metaverse objects are issued as **ERC-721 / ERC-1155 tokens**, turning every achievement or resource into a liquid, tradable asset.

Users can freely trade NFTs on MetaPlace or external marketplaces (OpenSea, Rarible, etc.), and use them across the metaverse — from avatar customization and land ownership to education-based credentials.

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### Functionality

MetaPlace supports a full trading stack:

* **Ask Orders (Sell Orders):** NFT owners list tokens with price and expiration; orders are signed off-chain (EIP-712) and executed on-chain when a buyer accepts.
* **Bid Orders (Buy Orders):** Buyers submit signed bids or deposits; sellers can accept bids directly through smart contracts.
* **Auctions:** Multiple formats are supported to fit different asset types:
  * *English Auction*: price increases with each bid (for rare items and unique certificates).
  * *Dutch Auction*: price decreases until first purchase (for mass drops like clothing or land plots).
  * *Sealed-Bid Auction*: hidden bids revealed at the end (for high-value NFTs).
  * *Reserve Price Auction*: minimum price must be reached (for premium assets).

All transactions are secured by smart contracts with escrow mechanics, ensuring transparency and fairness.

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### Ecosystem Role

MetaPlace extends the Meta Whale ecosystem by:

* Turning ecosystem progress and achievements into liquid NFTs.
* Enabling secondary trading of ecosystem assets with built-in royalty support (ERC-2981 standard).
* Supporting in-ecosystem utility — NFTs can be applied in Meta Whale metaverse environments, educational flows, and gamified programs.
* Ensuring CES token circulation — all transactions under the hood are settled in **CES**, even when users pay in other supported currencies, strengthening token demand.