x402 Preflight
Inspect and validate an x402 endpoint before an autonomous agent spends USDC.
MCP server · by chico10117
About
x402 Preflight is an MCP server published by chico10117. Marketplaces we read that list it: 1 (Official MCP Registry). We first saw it on 2026-10-11 and have recorded no change since. As of our marketplace pass on 2026-10-13.
What it asks for
- Runs remotely
None of the marketplaces we read publishes its tools or the settings it asks for.
What it declares, asks for and runs, in full
Only install plugins from developers you trust. We list what marketplaces publish and do not test plugins.
Works with
- Claude Code
- Codex
- Cursor
- VS Code
- Copilot CLI
A one-click link opens the client, which asks you to confirm before it adds the server.
From the marketplaces that list it and the MCP transport it declares, as each client documents them. We do not test plugins.
Connect
Commands and configs built only from what its marketplaces declare. We do not run them for you and do not test plugins.
As a remote MCP server
Built from what Official MCP Registry declares.
claude mcp add --transport http x402-preflight https://x402.chikocorp.com/mcp[mcp_servers.x402-preflight]
url = "https://x402.chikocorp.com/mcp"{
"mcpServers": {
"x402-preflight": {
"url": "https://x402.chikocorp.com/mcp"
}
}
}Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 1.0.1 | No figure published | Not marked |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
What changed
Nothing has moved on this plugin since we started watching it.
Similar plugins
Products whose own names, descriptions, tools and skills are closest in meaning to this one, on every marketplace we read. Closeness is ranked within this list only.
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Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base
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Pre-payment merchant trust checks for x402 agents on Base and Solana.
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Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.
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Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.
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Risk-check counterparties before an AI agent pays; pay x402 resources only after a verified allow
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AgentObserver - Check x402 Dependencies Before Paying
Check Exa, BlockRun, OneSource, Apify and other x402 dependencies before invoking or paying.
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Ask probe402's public record about an x402 or MPP endpoint before an agent pays it.
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mizan app.higgsfield.mizan-bazar/mizan
Check an x402 endpoint before your agent pays it: avoid / caution / ok, proven on-chain.
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Agent Reserve Protocol Authorization Firewall
Advisory policy preflight for AI-agent spend requests; never executes payments or accesses wallets.
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Check an x402 endpoint before your agent pays it: challenge validity and on-chain payer evidence.
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Deterministic pre-execution verification tools for AI agents with x402 USDC pay-per-call on Base
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Pre-payment merchant trust checks for x402 agents on Base and Solana.
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Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.
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Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.
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Risk-check counterparties before an AI agent pays; pay x402 resources only after a verified allow
Found by meaning, not by shared code or a shared repository: similar plugins stay separate products, and this is not a review or a recommendation.
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Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.