x402lint
Free x402 endpoint linter: checks the unpaid 402 challenge, payTo/asset/amount, CORS, discovery.
What it does
x402lint is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
From the publisher's description, Electra Index matched it to one capability: code review. That makes it a candidate for tasks such as review pull requests or scan code for vulnerabilities.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 2h ago (live check)Hosted endpoint
https://x402lint.something-agent.workers.dev/mcpstreamable-http
In Claude Code: claude mcp add --transport http x402lint-1 https://x402lint.something-agent.workers.dev/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"x402lint-1": {
"url": "https://x402lint.something-agent.workers.dev/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 2h agoONLINE x402lint answered an MCP connection on 27 Oct 2026 and introduced itself as x402lint 0.1.0 (MCP protocol 2025-06-18).
2 tools offered to AI assistants
lint_x402_endpoint· Unpaid lint of an x402 endpoint: fetches the 402 (GET and POST), then checks the challenge (version, accepts[] fields, CAIP-2 network, payTo/asset/amount sanity, EIP-712 name/version, timeouts, resource), transport (redirects, cache headerslint_payment_required· Lint a PaymentRequired object you already have (decoded JSON, a JSON string, or the raw base64 PAYMENT-REQUIRED header). Same field/value checks as lint_x402_endpoint, no network access. Free.
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.
Tasks it helps with
Share of each task's required capabilities it covers| Review pull requests Code Review | 50% |
| Scan code for vulnerabilities Code Review | 50% |
| Migrate a codebase to a new framework Code Review | 33% |
| Write technical documentation Code Review | 33% |
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Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://x402lint.something-agent.workers.dev/mcp | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Website | https://x402lint.something-agent.workers.dev | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Repository | https://github.com/something-agent/x402lint | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| Version | 0.1.0 | DECLARED | SRC-001 Official MCP Registry | 2h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 2h ago |
Change history
- NEW27 Oct 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is x402lint still online?
Free alerts · no accountDo you run x402lint? Know when it stops answering
For publishers · optionalIts hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.
Monitoring never changes a score or a rank.
Are you the publisher of x402lint?
Free · show your listingAn independent listing builds trust with your buyers. Announce it, and add the badge to your website or README.
<a href="https://electraindex.com/mcp/x402lint-1?utm_source=badge&utm_medium=share&utm_campaign=listing"><img src="https://electraindex.com/api/badge/x402lint-1" alt="Listed on Electra Index"></a>Questions about x402lint
How do I connect x402lint?
Use the hosted endpoint https://x402lint.something-agent.workers.dev/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does x402lint offer?
When Electra Index connected on 27 Oct 2026, it listed 2 tools: lint_x402_endpoint, lint_payment_required. The full list is in "Live check" above.
Is x402lint online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 2h ago.
What can I use x402lint for?
Based on its description, it is most relevant to: review pull requests, scan code for vulnerabilities, migrate a codebase to a new framework, write technical documentation.