Buy a prepaid API key with $2.00 of credit

Use when your client cannot sign an x402 payment on every call, or to pay many calls (rug checks, launch polls, wallet and creator cards) from one purchase; not needed if your client already pays x402. Each new payment here buys a new $2.00 key. One x402 payment of $2.00 (USDC on Solana or Base; by header, or in a browser with a wallet) returns a key lt_... holding $2.00 of credit. Send it as the X-API-Key header on any paid HTTP route and that route's price is deducted; no x402 client is needed after the purchase (the same header on POST /mcp pays the MCP tools). Free balance: GET /v1/keys/balance with the header. Credit does not expire; the key is a bearer secret. The key activates when the same request settles; the same signed payment retried before it settles returns the same key; the store keeps only a hash of the key, so a delivered key is shown once.