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HTTP 402 for AI agents. Robinhood-native facilitator for x402 micropayments. Settled in 400ms, 0.5% fee. Verge is an HTTP 402 gateway and SDK. Your server returns a payment challenge, the caller pays on a supported rail, then retries with the transaction proof. Robinhood Chain + USDG is the default; other rails are selected with a single network option. Build paid APIs for agents, apps, and users.