02web3
02.1scope
MOD-02
Blockchain
& Web3
Smart contracts, mint sites and wallet integration. We model gas costs before you pick a chain, because that decision is expensive to reverse and nobody shows you the numbers up front.
FIG. 02 — contract module diagram
02.2gas estimator
Live cost model. Pick a chain and an operation — figures recalculate against the gas price you set.
estimated cost
$0.00
- gas units
- 0
- native
- 0
- chain
- —
- ×1,000 mints
- $0
02.3contract spec
What ships
| Artefact | Detail |
|---|---|
| Contract | ERC-721 or ERC-1155, OpenZeppelin base |
| Tests | Hardhat suite, >90% coverage |
| Review pass | Reentrancy, overflow, access control, gas |
| Testnet deploy | Verified on explorer before mainnet |
| Mint site | Wallet connect, supply counter, error states |
| Metadata | IPFS pinned, frozen after reveal |
| Runbook | Deploy, pause, withdraw, transfer ownership |
Review checklist
// run before every mainnet deploy
✓ reentrancy guard on withdraw
✓ access control on admin fns
✓ supply cap enforced on-chain
✓ mint price immutable after deploy
✓ metadata URI freezable
✓ no tx.origin auth anywhere
✓ withdraw uses call, not transfer
✓ events emitted on state change
! no upgradeable proxy unless requested
We are not a substitute for a formal audit on high-value contracts. Above roughly $250k TVL we will tell you to commission one.