OpenRouter's card checkout runs through a processor (Coinbase Commerce) that flags most prepaid and virtual cards on risk control — RedotPay, Mercado Pago prepaid, and similar cards are declined at a high rate regardless of your balance. This isn't a problem with your funds; it's the processor's risk rules for that card category.
Email support usually can't fix a processor-level decline, since it isn't an account issue on OpenRouter's side. If you have another card type (a standard bank-issued credit or debit card) it's worth trying that first.
If prepaid/virtual cards are your only option, paying with crypto skips the card processor entirely. ROZO Checkout lets you pay an OpenRouter link with USDT, USDC, BTC Lightning, Solana, and more, for a 1% fee — an alternative path, not a fix for the card decline itself. ROZO is independent and not affiliated with OpenRouter or Coinbase.