Agents can now pay 1,300+ x402 services on Base. How should an agent decide which ones to trust before it pays?

I've been digging into x402 (the pay per call standard for agents). On Coinbase's agentic.market there are already 1,300+ paid services live on Base: web search, on chain analytics, browser automation, data APIs. Exa, Nansen, Browserbase, and many more. What I can't figure out: how should an agent decide which one to actually pay? Right now there's no success rate, no latency history, no proof the money even moved and got a real response. The agent just sends USDC and hopes. So I'm curious how people here think about it: What signal would you want before letting an agent pay a service it has never used? Success rate and latency from other callers? A settlement tx you can verify on chain? Seller signed guarantees? Escrow? Or do you just try it with a tiny budget and see? Full disclosure: I'm building something in this exact space (a layer that records client observed reliability per call, on chain settlement included), so I'm biased. But I'd rather hear how you'd want this to work before I build more of it. Happy to share the repo if anyone's interested, but mostly I want the discussion. How are you handling agent to service trust today?