# x402check.dev MCP server

> x402check.dev MCP server, an MCP server by x402check.dev, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Preflight before paying any x402 tool (ok|caution|avoid + history). 1 free/wallet; then $0.01 Base.

- Canonical: https://www.anchorterminal.com/tools/x402check-mcp
- Markdown: https://www.anchorterminal.com/tools/x402check-mcp.md (~900 tokens)
- Slim: https://www.anchorterminal.com/tools/x402check-mcp.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/x402check-mcp.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT x402check-mcp.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-09

# x402check.dev MCP server

> Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: MCP server, by x402check.dev (https://x402check.dev)
- Category: Travel & booking (https://www.anchorterminal.com/categories/travel.md)
- Listed because: It's published in the registry under x402check.dev, a namespace the registry only gives to whoever proves they control that domain. It's in real use: 1,206 npm downloads a week.
- What the official MCP registry says: Preflight before paying any x402 tool (ok\|caution\|avoid + history). 1 free/wallet; then $0.01 Base.

## Facts

- MCP registry: `dev.x402check/mcp` 0.1.6
- Endpoint: https://x402check.dev/mcp (streamable HTTP)
- Package: npm `x402check-mcp` (stdio)
- Website: https://x402check.dev
- npm downloads a week: 1,206
- Registry entry updated: 2026-11-02

## Tools

- Tools it lists (6, about 1,350 tokens of context, `tools/list` without credentials, checked 2026-11-09 02:23 UTC):
  - `preflight_check` (writes): Preflight an x402 seller URL before settle / PAYMENT-SIGNATURE. Pass the absolute https seller URL. Returns verdict ok|caution|avoid plus that tool's history…
  - `verify_payto` (writes): Verify the payTo / receiving wallet an x402 seller demands before you sign. Same check as preflight_check: live 402 probe + history.payToChanges (wallet…
  - `preflight_batch` (writes): Trust-check up to 25 x402 seller URLs in one request. Charged per URL (N × unit) in a single Exact settlement via MCP _meta payment. Prefer when comparing…
  - `compare_tools` (writes): Compare several x402 tools before choosing which to pay. Alias of preflight_batch: returns each URL's verdict, priceUsd, payTo, uptimePct, and drift history so…
  - `deep_check` (writes): Deeper trust check before paying an x402 endpoint ($0.05 Exact USDC). Runs the same live 402 + history as preflight_check, then repeated probes for payTo/price…
  - `watch_tool` (writes): Subscribe to daily re-checks of one x402 seller URL for 30 days. Alerts your webhook and/or email when payTo, price, network, or availability changes. Fixed $5…
- How its tools read to an agent (0 errors, 2 warnings, 1 note, about 1,350 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):
  - warn TC11 compare_tools: 1 parameter without a description: fresh
  - warn TC11 preflight_batch: 1 parameter without a description: fresh
  - note TC24 server: 6 of 6 tools have no outputSchema

- JSON: https://www.anchorterminal.com/api/v1/tools/x402check-mcp.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming

---

Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp