frontpage-buy-ad-dev

Dev/testnet variant of frontpage-buy-ad. That skill carries the full flow — endpoints, payload shape, pricing, image specs, errors — and everything there applies here, with these overrides:

Overrides

• Base URL: $FRONTPAGE_BASE_URL if set, otherwise http://localhost:3000. Never https://frontpage.sh.
• Network: Tempo Moderato testnet (chain id 42431). Pin mppx to it: export MPPX_RPC_URL=https://rpc.moderato.tempo.xyz (per-call --network testnet also works).
• Money: testnet USDC only — top up from the Tempo testnet faucet. Prices are real in shape, worthless in value.
• Keys: use a throwaway dev wallet. Never point a mainnet key at a dev instance.

Worked example

export FRONTPAGE_BASE_URL=http://localhost:3000
export MPPX_RPC_URL=https://rpc.moderato.tempo.xyz