x402 facilitator

Payment Sandbox Wizard

Build the payload, sign it, and run it through the live facilitator. Verify is free. Settle is a dry run. No USDC moves on Base mainnet.

Minimum 0.01. The envelope uses USDC base units (6 decimals).

Default is this facilitator's treasury. A different payee can still be verified, but the dry run will not call it settleable.

Network Base · eip155:8453

Add the payer before you copy. The zero address is only a placeholder.

EIP-712 typed data

Waiting for the payload.

Waiting to verify.

Simulation — no USDC moves on Base mainnet.

USDC to transfer
Gas
Fee to payer
Snapshot
Rejection reasons

Counters load from the sandbox database when the dry run finishes.

–runs total
–runs, 7 days
–verified clean, 7 days
–verify failed, 7 days
–simulate settleable, 7 days
–first run
–last run
Raw simulate verdict