x402 Conformance
x402 payment safety checks: validate a 402 answer, prove a server never serves before settlement.
MCP server · by atsp-protocol
About
x402 Conformance is an MCP server published by atsp-protocol. Marketplaces we read that list it: 1 (Official MCP Registry). The last change we recorded was on 2026-10-24. As of our marketplace pass on 2026-10-24.
What it asks for
- Runs on your machine
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 local MCP server: npm package
Built from what Official MCP Registry declares.
claude mcp add --transport stdio x402-conformance -- npx -y x402-conformance-mcp[mcp_servers.x402-conformance]
command = "npx"
args = ["-y", "x402-conformance-mcp"]{
"mcpServers": {
"x402-conformance": {
"command": "npx",
"args": [
"-y",
"x402-conformance-mcp"
]
}
}
}Where it is published
| Marketplace | Status | Version | Figures | Verified | First seen |
|---|---|---|---|---|---|
| Official MCP Registry (Open the registry record) | Listed | 1.5.0 | Forks (GitHub): 0 Stars (GitHub): 0 |
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
- Official MCP Registry: released version 1.5.0 (was 1.4.0)
- Became a product we track
- Official MCP Registry: appeared
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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Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.
-
x402-payment-safety io.github.AgentTanuki/x402-payment-safety
Authorize x402 payments before signing with request-bound, signed safety decisions.
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Call before paying an x402 resource. Returns PAY/BLOCKED. Does not move funds.
-
Checks x402 endpoint conformance before an agent pays, and links the receipt to its settlement.
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Verify signed x402 payments; treasury-scoped settlement is irreversible.
-
Read-only on-chain receipt check for x402 payments; confirm settlement before trusting a tx.
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x402 payment-request parser with a limited token list. Does not sign, approve or judge payments.
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Check an x402 endpoint before your agent pays it: challenge validity and on-chain payer evidence.
-
402sentinel-mcp io.github.kaditang/402sentinel-mcp
DEPRECATED: hosted 402Sentinel retired 2026-10-31. Client for x402 payment-safety checks.
-
x402 Compatibility Intelligence
Preflight x402 payment compatibility with structured risk evidence and remediation guidance.
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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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