Base (production) - Numpay Docs

Numpay’s production app at app.numpay.app runs on Base mainnet.

	Value
Chain ID	`8453` (`0x2105`)
Explorer	basescan.org
Token	Native Circle USDC, `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`, 6 decimals
EntryPoint	v0.7, `0x0000000071727De22E5E9d8BAf0edAc6f37da032`
Smart account	ZeroDev Kernel v3.3, ECDSA validator, index 0
Bundler and paymaster	ZeroDev (one RPC URL serves both)
Gas token	ETH, paid by the paymaster
Ways in	Card (Onramper), NEAR wallet (NEAR Intents)

Why Base

Native USDC. Circle issues USDC directly on Base, so balances are redeemable dollars, not a bridged copy.
Low fees and fast blocks. About two-second blocks and sub-cent transfers keep sponsorship cheap.
Mature account abstraction. ERC-4337 bundlers and paymasters from several providers are live.
On-ramps. Card providers sell USDC on Base directly to a wallet address.

Verifying a payment

Every payment’s txhash is stored in the history. Look it up on Basescan to see the USDC Transfer event from the sender’s smart account to the recipient’s.