Prepaid API credits ($5 pack with bonus). Prepaid credits for the YourAITools agent APIs: one x402 payment of $5 USDC mints an API key holding $5.50 of credits ($0.50 bonus). Send it as Authorization: Bearer <key> to PayGuard, TokenVerdict, SignCheck, WebRead, InjectScan, DomainCheck, PkgGuard, StackDetect or AgentGate paid routes; each call debits its normal price instead of an on-chain payment. Key shown once. Prepaid API usage only, not refundable.