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$tx402
tx402 is the spend-governance layer for x402 buyers Set per-request caps, hourly budgets, and allowlists - enforced before any key is touched - so an agent pays for what it needs and never beyond the limits you set Then it completes the 402 handshake, routes across the chains a merchant accepts, and fails over RPC endpoints so a long workflow doesn't stall. Settlement stays with the merchant's facilitator