ERC-1155 (Multi-Tokens)

{
  "name": "Health Potion",
  "description": "Restores 50 HP",
  "image": "https://assets.example.com/potion.png",
  "attributes": [
    { "trait_type": "Type", "value": "Consumable" },
    { "trait_type": "Healing", "display_type": "number", "value": 50 }
  ]
}

curl -X POST '{baseURL}/v1/chains/{chain_name}/collections/{contract_address}/nfts/mint-requests' \
  -H 'x-immutable-api-key: YOUR_SECRET_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "assets": [{
      "owner_address": "0xRecipient",
      "token_id": "1",
      "amount": "10",
      "metadata": {
        "name": "Health Potion",
        "image": "https://assets.example.com/potion.png"
      }
    }]
  }'

const assets = [
  { owner_address: player, token_id: "1", amount: "5", metadata: healthPotion },
  { owner_address: player, token_id: "2", amount: "3", metadata: manaPotion },
  { owner_address: player, token_id: "3", amount: "10", metadata: ironOre },
];

await fetch(`${API_URL}/collections/${contract}/nfts/mint-requests`, {
  method: 'POST',
  headers: { 'x-immutable-api-key': secretKey },
  body: JSON.stringify({ assets }),
});

// Mint 100 health potions
await mint({ token_id: "1", amount: "100", metadata: healthPotion });

// Player transfers 10 to friend
await contract.safeTransferFrom(player, friend, "1", 10, "0x");

// Mint unique weapons
await mint({ token_id: "1001", amount: "1", metadata: uniqueSword });
await mint({ token_id: "1002", amount: "1", metadata: uniqueShield });

async function openLootBox(playerAddress: string) {
  const rewards = generateRandomRewards();
  
  const assets = rewards.map((reward, i) => ({
    owner_address: playerAddress,
    token_id: reward.tokenId,
    amount: String(reward.quantity),
  }));
  
  await mintBatch(assets);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@imtbl/contracts/contracts/token/erc1155/preset/ImmutableERC1155.sol";

contract MyGameItems is ImmutableERC1155 {
    constructor(
        address owner,
        string memory name,
        string memory baseURI,
        string memory contractURI,
        address operatorAllowlist,
        address royaltyReceiver,
        uint96 royaltyFeeNumerator
    ) ImmutableERC1155(
        owner, name, baseURI, contractURI,
        operatorAllowlist, royaltyReceiver, royaltyFeeNumerator
    ) {}
}