Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base
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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 | Preflight Checks (x402) | - | 2 Oct 2026 |
| Smithery | Preflight Checks (x402) | - | 2 Oct 2026 |