feat: add GnopenSea

packages/r/pierre115/gnopensea/README.md

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+# Gnoland NFT Marketplace
+
+A fully-featured NFT marketplace for Gnoland blockchain with automatic royalty distribution (GRC-2981 compliant).
+
+## Features
+
+- GRC-721 compatible - works with any NFT collection implementing the standard
+- Automatic royalties - supports GRC-2981 with automatic distribution
+- Fixed price listings for immediate purchase
+- Secure atomic transfers
+- Configurable marketplace fees (default 2.5%)
+- Complete on-chain sales history
+- Volume and royalty statistics
+
+## Architecture
+
+```
+Marketplace Realm
+├── Listings (Active)
+├── Sales (History)
+└── Payment Distribution
+    ├── Seller
+    ├── Royalty (if GRC-2981)
+    └── Marketplace Fee
+
+NFT Collection (GRC-721)
+├── OwnerOf()
+├── TransferFrom()
+├── Approve() / SetApprovalForAll()
+└── RoyaltyInfo() (optional)
+```
+
+## Usage
+
+### For Sellers
+
+#### Step 1: Approve the Marketplace
+
+```bash
+# Approve for all NFTs (recommended)
+gnokey maketx call \
+  -pkgpath "gno.land/r/[username]/MYNFT" \
+  -func "SetApprovalForAll" \
+  -args "g1marketplace_address" \
+  -args "true" \
+  -broadcast \
+  yourkey
+
+# Or approve for a specific NFT
+gnokey maketx call \
+  -pkgpath "gno.land/r/[username]/MYNFT" \
+  -func "Approve" \
+  -args "g1marketplace_address" \
+  -args "1" \
+  -broadcast \
+  yourkey
+```
+
+#### Step 2: Create a Listing
+
+
+```bash
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "CreateListing" \
+  -args "mynft.Getter()" \
+  -args "1" \
+  -args "5000000" \
+  -broadcast \
+  yourkey
+```
+
+Parameters:
+- `nftGetter`: Function returning the NFT collection instance
+- `tokenId`: Token ID to sell
+- `price`: Price in ugnot (5000000 = 5 GNOT)
+
+#### Step 3: Manage Listing
+
+```bash
+# Update price
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "UpdatePrice" \
+  -args "1" \
+  -args "10000000" \
+  -broadcast \
+  yourkey
+
+# Cancel listing
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "CancelListing" \
+  -args "1" \
+  -broadcast \
+  yourkey
+```
+
+### For Buyers
+
+```bash
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "BuyNFT" \
+  -args "1" \
+  -send "5000000ugnot" \
+  -broadcast \
+  yourkey
+```
+
+Purchase process:
+1. Payment verified
+2. Royalties calculated (if GRC-2981 supported)
+3. Payments distributed
+4. NFT transferred
+5. Excess refunded
+
+### For Admins
+
+```bash
+# Set marketplace fee (in basis points: 100 = 1%, max 1000 = 10%)
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "SetMarketplaceFee" \
+  -args "500" \
+  -broadcast \
+  adminkey
+
+# Withdraw accumulated fees
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "WithdrawFees" \
+  -broadcast \
+  adminkey
+```
+
+## Functions Reference
+
+### Public Functions
+
+- `CreateListing(nftGetter, tokenId, price)` - List an NFT for sale
+- `BuyNFT(listingId)` - Purchase a listed NFT
+- `CancelListing(listingId)` - Cancel your listing
+- `UpdatePrice(listingId, newPrice)` - Update listing price
+
+### Read Functions
+
+- `GetListing(listingId)` - Get listing details
+- `GetSale(saleId)` - Get sale details
+- `GetActiveListingsCount()` - Number of active listings
+- `GetTotalSales()` - Total sales count
+- `GetTotalVolume()` - Total volume traded
+- `GetTotalRoyaltiesPaid()` - Total royalties distributed
+- `GetRoyaltyBreakdown(listingId)` - Calculate payment distribution
+- `GetBalance()` - Marketplace balance
+- `GetMarketplaceFee()` - Current fee (basis points)
+- `GetMarketplaceAddress()` - Marketplace realm address
+
+### Admin Functions
+
+- `SetMarketplaceFee(newFee)` - Update marketplace fee
+- `WithdrawFees()` - Withdraw accumulated fees
+
+## Payment Distribution
+
+Example with 10% royalty:
+
+```
+Sale Price: 100 GNOT
+├── Marketplace Fee (2.5%): 2.5 GNOT
+├── Creator Royalty (10%): 10 GNOT
+└── Seller Receives: 87.5 GNOT
+```
+
+Example without royalty:
+
+```
+Sale Price: 100 GNOT
+├── Marketplace Fee (2.5%): 2.5 GNOT
+└── Seller Receives: 97.5 GNOT
+```
+
+## Complete Workflow Example
+
+```bash
+# 1. Deploy NFT collection
+gnokey maketx addpkg \
+  --pkgpath "gno.land/r/alice/mycollection" \
+  --pkgdir "./mycollection" \
+  --broadcast \
+  alice
+
+# 2. Mint an NFT
+gnokey maketx call \
+  -pkgpath "gno.land/r/alice/mycollection" \
+  -func "Mint" \
+  -send "1000000ugnot" \
+  -broadcast \
+  alice
+
+# 3. Approve marketplace
+gnokey maketx call \
+  -pkgpath "gno.land/r/alice/mycollection" \
+  -func "SetApprovalForAll" \
+  -args "g1marketplace_address" \
+  -args "true" \
+  -broadcast \
+  alice
+
+# 4. List for 5 GNOT
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "CreateListing" \
+  -args "mycollection.Getter()" \
+  -args "1" \
+  -args "5000000" \
+  -broadcast \
+  alice
+
+# 5. Purchase NFT
+gnokey maketx call \
+  -pkgpath "gno.land/r/pierre115/gnopensea" \
+  -func "BuyNFT" \
+  -args "1" \
+  -send "5000000ugnot" \
+  -broadcast \
+  bob
+```
+
+## Querying Data
+
+```bash
+# View marketplace home
+curl https://test4.gno.land/r/demo/marketplace:
+
+# View statistics
+curl https://test4.gno.land/r/demo/marketplace:stats
+
+# View specific listing
+curl https://test4.gno.land/r/demo/marketplace:listing/1
+
+# View sale details
+curl https://test4.gno.land/r/demo/marketplace:sale/1
+```
+
+## Security Features
+
+### Built-in Protections
+
+- Ownership verification before listing and sale
+- Approval checks at listing and sale time
+- Payment validation with automatic refunds
+- Atomic transactions (all-or-nothing)
+- Admin fee limits (0-10%)
+
+### Best Practices
+
+Do:
+- Verify listing details before purchasing
+- Use `SetApprovalForAll()` for easier management
+- Check marketplace fee before listing
+- Verify royalty percentages
+
+Don't:
+- Send more than listing price (wastes gas)
+- List NFTs you don't own
+- Forget to approve marketplace
+
+## NFT Collection Integration
+
+### Minimal Requirements
+
+```go
+import "gno.land/p/demo/grc/grc721"
+
+var nft *grc721.basicNFT
+
+func init() {
+    nft = grc721.NewBasicNFT("MyCollection", "MC")
+}
+
+func Getter() grc721.NFTGetter {
+    return nft.Getter()
+}
+```
+
+### With Royalties (Optional)
+
+```go
+var nft *grc721.royaltyNFT
+
+func init() {
+    nft = grc721.NewNFTWithRoyalty("MyCollection", "MC")
+}
+
+func Mint() {
+    // ... mint logic
+    royaltyInfo := grc721.RoyaltyInfo{
+        PaymentAddress: creator,
+        Percentage:     10, // 10%
+    }
+    nft.SetTokenRoyalty(tokenId, royaltyInfo)
+}
+
+func Getter() grc721.NFTGetter {
+    return nft.Getter()
+}
+```

packages/r/pierre115/gnopensea/admin.gno

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+package gnopensea
+
+import (
+	"chain/banker"
+	"chain/runtime"
+)
+
+// ============= ADMIN =============
+
+func SetMarketplaceFee(newFee int64) {
+	caller := runtime.PreviousRealm().Address()
+	if caller != admin {
+		panic("Only admin can modify fees")
+	}
+
+	if newFee < 0 || newFee > 1000 { // Max 10%
+		panic("Fees must be between 0% and 10%")
+	}
+
+	marketplaceFee = newFee
+}
+
+func WithdrawFees() {
+	caller := runtime.PreviousRealm().Address()
+	if caller != admin {
+		panic("Only admin can withdraw fees")
+	}
+
+	// Use NewBanker instead of GetBanker
+	bnkr := banker.NewBanker(banker.BankerTypeRealmSend)
+	realmAddr := runtime.CurrentRealm().Address()
+
+	// Get balance of the realm
+	balance := bnkr.GetCoins(realmAddr)
+
+	if balance.AmountOf("ugnot") > 0 {
+		bnkr.SendCoins(realmAddr, admin, balance)
+	}
+}

packages/r/pierre115/gnopensea/gnomod.toml

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+module = "gno.land/r/pierre115/gnopensea"
+gno = "0.9"