Token Standards

Urblock supports 10 token standards covering fungible tokens, NFTs, security tokens, and specialized use cases.

When to Use Which Standard

Do you need on-chain compliance (KYC/AML)?
  ├── Yes → ERC-3643 (T-REX)
  └── No
       ├── Fungible token?
       │    ├── Need governance voting?     → ERC-20 Votes
       │    ├── Need payment callbacks?     → ERC-1363
       │    ├── Need lowest gas costs?      → ERC-20 Solady
       │    └── Standard fungible           → ERC-20
       ├── Non-fungible token?
       │    ├── Must be non-transferable?   → SBT
       │    ├── Need lowest gas costs?      → ERC-721 Solady
       │    └── Standard NFT               → ERC-721
       └── Mixed fungible + NFT?
            ├── Need lowest gas costs?      → ERC-1155 Solady
            └── Standard multi-token        → ERC-1155

Quick Reference

Standard	Type	Key Feature	Use Case
ERC20	Fungible	Standard fungible	Currencies, utility tokens
ERC20_VOTES	Fungible	Voting + delegation	Governance tokens, DAOs
ERC721	NFT	Unique tokens	Collectibles, art, real estate
ERC1155	Multi	Fungible + NFT	Games, mixed collections
ERC3643	Security	On-chain compliance	Regulated securities, RWA
SBT	NFT	Non-transferable	Credentials, reputation
ERC1363	Fungible	Callback on transfer	Payments, subscriptions
ERC20_SOLADY	Fungible	Gas-optimized ~40%	High-volume tokens
ERC721_SOLADY	NFT	Gas-optimized ~45%	Large NFT collections
ERC1155_SOLADY	Multi	Gas-optimized ~50%	Gaming items

Fungible Tokens

ERC-20

The standard fungible token. Features: mint, burn, pause, transfer, approve.

await urblock.tokens.create({
  name: "My Token", symbol: "MTK",
  standard: "ERC20",
  network: "polygon_amoy",
  initial_supply: "1000000000000000000000000",
  features: { mintable: true, burnable: true, pausable: true },
  idempotency_key: "erc20-001",
});

ERC-20 Votes

ERC-20 with vote delegation for governance. Includes EIP-2612 Permit for gasless approvals. Required for Governor-based governance.

await urblock.tokens.create({
  name: "DAO Token", symbol: "DAO",
  standard: "ERC20_VOTES",
  network: "polygon_amoy",
  initial_supply: "1000000000000000000000000",
  idempotency_key: "votes-001",
});

ERC-1363

Payable token — triggers a callback on the receiver when transferred, enabling "approve and call" in a single transaction.

await urblock.tokens.create({
  name: "Payable Token", symbol: "PAY",
  standard: "ERC1363",
  network: "polygon_amoy",
  initial_supply: "1000000000000000000000000",
  idempotency_key: "erc1363-001",
});

Non-Fungible Tokens

ERC-721

Standard NFT with enumeration, URI storage, royalties (ERC-2981), and access control.

await urblock.tokens.create({
  name: "Art Collection", symbol: "ART",
  standard: "ERC721",
  network: "polygon_amoy",
  features: { mintable: true, burnable: true, pausable: true, royalty: true },
  default_royalty: { receiver: "0x...", fee_basis_points: 500 },
  idempotency_key: "erc721-001",
});

SBT (EIP-5192)

Soulbound Token — a non-transferable NFT. locked() always returns true. Transfers are blocked at the contract level.

await urblock.tokens.create({
  name: "Certificate", symbol: "CERT",
  standard: "SBT",
  network: "polygon_amoy",
  features: { mintable: true },
  idempotency_key: "sbt-001",
});

Multi-Token

ERC-1155

Multi-token standard supporting both fungible and non-fungible token types in a single contract. Native batch operations.

await urblock.tokens.create({
  name: "Game Items", symbol: "ITEM",
  standard: "ERC1155",
  network: "polygon_amoy",
  features: { mintable: true, burnable: true, pausable: true },
  idempotency_key: "erc1155-001",
});

Security Tokens

ERC-3643 (T-REX)

Regulated security token with on-chain compliance enforcement. Requires identity registry, compliance modules, and trusted issuers.

await urblock.tokens.create({
  name: "Security Fund", symbol: "SEC",
  standard: "ERC3643",
  network: "polygon_amoy",
  required_claim_topics: [1, 7],
  idempotency_key: "erc3643-001",
});

Gas-Optimized (Solady)

Solady variants are ABI-compatible with their standard counterparts but use assembly-optimized implementations for lower gas costs.

Original	Solady	Gas Savings
ERC20	ERC20_SOLADY	~40%
ERC721	ERC721_SOLADY	~45%
ERC1155	ERC1155_SOLADY	~50%

// Same API, less gas
await urblock.tokens.create({
  name: "Efficient Token", symbol: "EFF",
  standard: "ERC20_SOLADY",
  network: "polygon_amoy",
  initial_supply: "1000000000000000000000000",
  idempotency_key: "solady-001",
});

Feature Flags

When deploying, you can enable/disable features (set at deploy, immutable):

Feature	Description	Available For
mintable	Allow minting new tokens	All standards
burnable	Allow burning tokens	All standards
pausable	Allow pausing transfers	All standards
royalty	ERC-2981 royalties	ERC-721, ERC-1155

features: {
  mintable: true,
  burnable: true,
  pausable: true,
  royalty: true,
}

Next Steps

• Deploy Your First Token — start with any standard
• Advanced Token Features — SBT, ERC-1363
• Gas Optimization — Solady and batch strategies
• Security Tokens — T-REX compliance setup
• Tokens API — deploy, mint, transfer, and manage tokens