Constants

B20 precompile addresses, role identifiers, policy scopes, and validation bounds.

Role identifiers, policy-type identifiers, precompile addresses, and other fixed constants. See B20Constants and StdPrecompiles.

Precompile addresses

Fixed addresses of Base’s singleton precompiles. See StdPrecompiles.

Name	Value	Purpose
B20_FACTORY_ADDRESS	0xB20f000000000000000000000000000000000000	Deploys and looks up B-20 tokens; every asset and stablecoin instance is created through the IB20Factory at this address.
POLICY_REGISTRY_ADDRESS	0x8453000000000000000000000000000000000002	Stores allowlist/blocklist/composite policies and answers isAuthorized checks consulted by every policy scope (see Policies).
ACTIVATION_REGISTRY_ADDRESS	0x8453000000000000000000000000000000000001	Gates whether a B-20 variant or feature is live on a given chain; checked by the factory before it will create that variant.

Roles

Role identifiers checked via hasRole. See B20Constants and IB20. Hex values are keccak256 of the role name, verified with cast keccak "<NAME>" and cross-checked in chisel.

Name	Value	Purpose
DEFAULT_ADMIN_ROLE	bytes32(0)	Required to call grantRole, revokeRole, setRoleAdmin, updatePolicy, and updateSupplyCap.
MINT_ROLE	keccak256("MINT_ROLE") 0x154c00819833dac601ee5ddded6fda79d9d8b506b911b3dbd54cdb95fe6c3686	Required to call mint and mintWithMemo.
BURN_ROLE	keccak256("BURN_ROLE") 0xe97b137254058bd94f28d2f3eb79e2d34074ffb488d042e3bc958e0a57d2fa22	Required to call burn and burnWithMemo.
BURN_BLOCKED_ROLE	keccak256("BURN_BLOCKED_ROLE") 0x7408fdc0d31c7bcb349eab611f5d1168acd4303574993f8cdc98b1cd18c41cae	Required to call the deprecated burnBlocked.
SEIZE_ROLE	keccak256("SEIZE_ROLE") 0x3469b8b0d89e9604f8510ed143f74a8336d22955d4f83e23bf53d9414e27f432	Required to call seizeWithMemo.
PAUSE_ROLE	keccak256("PAUSE_ROLE") 0x139c2898040ef16910dc9f44dc697df79363da767d8bc92f2e310312b816e46d	Required to call pause.
UNPAUSE_ROLE	keccak256("UNPAUSE_ROLE") 0x265b220c5a8891efdd9e1b1b7fa72f257bd5169f8d87e319cf3dad6ff52b94ae	Required to call unpause.
METADATA_ROLE	keccak256("METADATA_ROLE") 0x6bd6b5318a46e5fff572d5e4258a20774aab40cc35ac7680654b9081fcc82f80	Required to call updateName, updateSymbol, updateContractURI, and updateExtraMetadata.
OPERATOR_ROLE	keccak256("OPERATOR_ROLE") 0x97667070c54ef182b0f5858b034beac1b6f3089aa2d3188bb1e8929f4fa9b929	B20Asset-only. Required to call announce, updateUIMultiplier, cancelUIMultiplierUpdate, and the deprecated updateMultiplier.

Policy types

Policy scopes consulted by the PolicyRegistry. See B20Constants and Policies. Hex values are keccak256 of the policy name, verified with cast keccak "<NAME>" and cross-checked in chisel.

Name	Value	Purpose
TRANSFER_SENDER_POLICY	keccak256("TRANSFER_SENDER_POLICY") 0xb81736c875ab819dd97f59f2a6542cfb731ad52b4ae15a6f24df2fb02b0327f5	Consulted for from on transfer and transferFrom.
TRANSFER_RECEIVER_POLICY	keccak256("TRANSFER_RECEIVER_POLICY") 0x8a4b3fa2d8b921852bc0089c6ef0958aa6961897be36fd731330fe2cd23f8363	Consulted for to on transfer and transferFrom.
TRANSFER_EXECUTOR_POLICY	keccak256("TRANSFER_EXECUTOR_POLICY") 0x10be5173aff2a44e748bd9acd8b19fe34689581398a9db7ba2fb671e786ff7d8	Consulted for msg.sender on every transfer entrypoint (transfer, transferFrom, and memo’d variants).
MINT_RECEIVER_POLICY	keccak256("MINT_RECEIVER_POLICY") 0xa0d5ae037e66a09119acf080a1d807abb9b6d03b6b9130eb19f7c1e6bdb8ffc8	Consulted for to on mint.
SEIZE_HOLDER_POLICY	keccak256("SEIZE_HOLDER_POLICY") 0x1497ab2b67ebb0a75dd9cdd6aec9f0e64620e6b87e911af7a088ac12e58d9ef2	Consulted for from on seizeWithMemo; from is seizable when unauthorized under this policy.
SEIZE_RECEIVER_POLICY	keccak256("SEIZE_RECEIVER_POLICY") 0xbf15b19caf5c77422c038bc25f26b8b815c3a14f6d04c6616076b81bcfe07b3d	Consulted for to on seizeWithMemo.

Feature and validation bounds

Bitmasks and inclusive bounds used for pause features and B20Asset creation validation. See B20Constants.

Name	Value	Purpose
ALL_FEATURES_PAUSED	15 (0b1111)	Bitmask with all PausableFeature bits set (TRANSFER | MINT | BURN | SEIZE).
MIN_ASSET_DECIMALS	6	Inclusive lower bound for B20AssetCreateParams.decimals; the floor most stablecoin-grade integrations expect.
MAX_ASSET_DECIMALS	18	Inclusive upper bound for B20AssetCreateParams.decimals; the ERC-20 community ceiling every common wallet/indexer renders correctly.
MAX_SUPPLY_CAP	type(uint128).max	Inclusive upper bound for the supply cap (and therefore totalSupply); doubles as the unbounded (“no cap”) sentinel.

Asset-variant precision constants

Fixed-point constants used by the multiplier/rebasing surface. See IB20Asset.

Name	Value	Purpose
WAD_PRECISION	1e18	Fixed-point precision used to scale multiplier; multiplier, toUIAmount, and fromUIAmount all divide/multiply by this.
MAX_UI_MULTIPLIER	type(uint128).max	Maximum multiplier the setters accept — the overflow guard enforced by updateMultiplier and updateUIMultiplier. Exposed so callers can read the bound without triggering InvalidMultiplier.