x402check

io.github.caiovicentino/x402checkv0.3.0Other

Risk-check counterparties before an AI agent pays; pay x402 resources only after a verified allow

The current version, v0.3.0, was published to the official MCP registry on 2026-09-30. It is distributed as @x402check/mcp on npm, filed under Other by this index, and declares 5 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using x402check in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

NOT YET SCREENEDno verdict on file

Verdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.

Own this server? Screen its description →

That verdict was true at screening time (snapshot 2026-10-01).

Contracts can change after screening, with no version bump. The gate pins x402check’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Environment variables

X402CHECK_CREDIT_TOKEN

secret

Prepaid credit token (x402c_…, from POST https://x402check.xyz/v1/credits): $0.001 a check

X402CHECK_PAYER_KEY

secret

Private key of a dedicated low-balance wallet: pays the x402 resources x402check_pay clears, and per-call checks without credits

X402CHECK_BUDGET_USD

Spend cap for this server process: the payer's spend (checks and resources), and separately what checks spend from prepaid credits

X402CHECK_PINNED_KEYS

Comma-separated RFC 7638 thumbprints of the attestation keys accepted (default: x402check's own keys, for its own issuer)

X402CHECK_MAX_PAYMENT_USD

The most a single payment may cost (a check or a resource)

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

Alternatives in Other

Clip Studio MCP

ai.clipstudio/mcp

Hosted MCP for Clip Studio public products — same plan as the website.

Drillr — The financial MCP for AI agents

ai.drillr/drillr

Financial data and research MCP for US/CN/JP equities: filings, statements, ownership, signals.

io.github.calademos/creditsync

Track credit card benefits, welcome offers, loyalty points, and money deadlines. No bank login.

Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "x402check": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@x402check/mcp"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<your-x402check_credit_token>",
        "X402CHECK_PAYER_KEY": "<your-x402check_payer_key>",
        "X402CHECK_BUDGET_USD": "1.00",
        "X402CHECK_PINNED_KEYS": "<x402check_pinned_keys>",
        "X402CHECK_MAX_PAYMENT_USD": "0.05"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "x402check": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@x402check/mcp"
      ],
      "env": {
        "X402CHECK_CREDIT_TOKEN": "<your-x402check_credit_token>",
        "X402CHECK_PAYER_KEY": "<your-x402check_payer_key>",
        "X402CHECK_BUDGET_USD": "1.00",
        "X402CHECK_PINNED_KEYS": "<x402check_pinned_keys>",
        "X402CHECK_MAX_PAYMENT_USD": "0.05"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- @x402check/mcp

Claude Code (claude mcp add)

claude mcp add --scope user x402check -- npx -y -- @x402check/mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user x402check npx -y -- @x402check/mcp

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-caiovicentino-x402check

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v0.3.0
category: Other
quality: 90 / 100
operator: caiovicentino

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Email us →

Provenance

Each verdict is bound to a hash of the exact description it judged, so a re-crawl that changes the text produces a new record rather than silently inheriting this one. Verdict history is hash-chained and anchored to Bitcoin via OpenTimestamps (latest confirmed at block 969,259). Verify it yourself.

Links

Repository →Website →