FAQ

Do I need to change my API code?

No. Point xPay at your existing HTTP endpoint and set pricing. We handle x402 payment verification and proxying.

What tokens are supported?

Any SPL token by mint address. USDC on Solana is the default/recommended.

How do agents discover my tools?

Your endpoints become MCP tools under /mcp/:username. xPay also provides a marketplace listing.

When do I get paid?

Per-request, instantly, after payment verification. Funds settle directly to your wallet.

Can I control auth to my upstream API?

Yes. Provide optional custom auth headers that xPay will add when forwarding requests.

How are prices represented?

paymentAmount is a decimal in the token’s standard units (e.g., 0.05 USDC).

Is there a sandbox?

Use low paymentAmount and local backend. Prefer a dedicated Solana RPC (SOLANA_RPC_URL) during testing.