> ## Documentation Index > Fetch the complete documentation index at: https://base-a060aa97-rayyan-sync-b20-docs-and-skills.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # B20 > Native token standard for issuing programmable assets and stablecoins on Base, with roles, policies, supply controls, and ERC-20 compatibility. B20 is Base's native token standard for issuing and managing programmable assets onchain. It is an ERC-20 superset with shared protocol logic for roles, policies, supply controls, and variant-specific Asset and Stablecoin capabilities. ## Learn B20 Start with B20's purpose, core primitives, and token-creation flow. Learn how B20 precompiles execute, route, and evolve across hardforks. ## Concepts Compare the Asset and Stablecoin variants and their capabilities. Configure allowlists, blocklists, composite policies, and policy scopes. Assign operational permissions and pause individual token features. Understand Asset multiplier behavior and ERC-8056 UI balances. ## Build on Base Use these Build on Base demos to create and operate B20 tokens. Create a B20 Asset token with deterministic factory deployment. Create a B20 Stablecoin with an immutable currency code. Apply a policy that limits asset ownership to eligible accounts. Schedule or apply an Asset UI multiplier for a corporate action. ## Reference For technical details, see the [B20 interfaces](/specifications/b20/reference/interfaces) and [B20 constants](/specifications/b20/reference/constants). Browse B20 interfaces, canonical Solidity sources, and copy-paste imports. Find precompile addresses, role identifiers, policy scopes, and validation bounds. Review custom errors, selectors, and the conditions that trigger them. Review B20 events and when each interface emits them.