Check Exa, BlockRun, OneSource, Apify and other x402 dependencies before invoking or paying.
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First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | AgentObserver - Check x402 Dependencies Before Paying | - | 2 Oct 2026 |