Top up the buyer's USDC balance via x402 payment. Funds chat completions on a Gemini-backed LLM runtime with optional RAG-style vector memory recall and write, plus semantic memory search and delete. Wallet is derived from the signed payment so credits always land on the payer's own account. Amount is in atomic USDC ($0.000001/unit, ticket $0.001 to $1000). Chat is billed per token.

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