The prepaid-credits rail was retired on 2026-09-06. There is no balance to top up and no deposit address — the platform is x402 pay-per-call only, settled in USDC on Base from your agent's own wallet.
What replaced it: GET /x402/<service> returns a 402 challenge; your agent settles it and retries. Every signed wallet also gets 5 free trial calls, no registration.
Redirecting to the payment guide in 3 seconds. How x402 payments work →