CHAINS

Base

Base is Coinbase's L2 and Tab's primary deployment target. Low fees, fast finality, and the deepest USDC liquidity in the ecosystem make it the default chain for new integrations.

Stablecoin

Tab settles in native USDC on Base (6 decimals). USDbC and other wrapped variants are not supported — only the canonical Circle USDC.

Block time and finality

Two-second blocks. Tab treats a payment as settled after the first confirmation, which is consistent with how Coinbase itself recognizes Base USDC transfers.

Gas sponsorship

Tab's relayers pay the gas. USDC on Base supports EIP-2612 permit, so the first interaction is fully gasless too — no separate approve transaction needed.

Contract addresses

TabRouter — 0xeBE551aaC8b6a32fdec707eDE79C77F136cb439E
TabBotRouter — 0x3024C5c83C4347A1d9a5C8aEFf2F2E18e2E87c11
TabEscrowRouter — 0xEA27bcB298b10e51738053496dA3FC4327122086
TabSubscriptionRouter — 0x4934e0ccfd63913F819667A0Cc32BF0DeBcdcad1
USDC — 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

RPC and explorer

Public RPC: https://mainnet.base.org. Explorer: basescan.org.

Rate limiting

BNB Smart Chain