MCP server

SpendPreflight Official

io.github.spendpreflight/spendpreflight

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Operated by SpendPreflight: free x402 Lint, CI Action and README badges; paid Guard and monitoring.

Website

At a glance

Type

MCP server

Publisher

spendpreflight.com (verified by the MCP Registry)

Status

Working at last check

Tools

10

Token cost

About 3,728 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http spendpreflight https://api.spendpreflight.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.spendpreflight]
url = "https://api.spendpreflight.com/mcp"

Gemini CLI

{"mcpServers":{"spendpreflight":{"httpUrl":"https://api.spendpreflight.com/mcp"}}}

Cursor

{"mcpServers":{"spendpreflight":{"url":"https://api.spendpreflight.com/mcp"}}}

VS Code

{"servers":{"spendpreflight":{"type":"http","url":"https://api.spendpreflight.com/mcp"}}}

Antigravity

agy mcp add spendpreflight https://api.spendpreflight.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"spendpreflight","server_url":"https://api.spendpreflight.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"spendpreflight","server_url":"https://api.spendpreflight.com/mcp"}

Tools

• check_endpoint ~375 tokens
  Cached x402 endpoint observations, operated by SpendPreflight. Returns a transparent score (or unknown), its components and seven-day unpaid probe history for an already publicly listed URL. Never fetches the caller's URL or pays the endpoint. Unlisted, unavailable or stale data is not charged. This
• check_listing ~297 tokens
  Compatibility alias of listing_guard for existing clients. Prefer listing_guard for a new detailed metadata check; these are the same operation, not two independent checks. Bazaar Listing Guard: CDP technical validation plus a bounded heuristic metadata screen for agent-directed instructions, embedd
• check_payee ~313 tokens
  Payee risk check. Screens a payee wallet address and name against the OFAC SDN sanctions list and checks the merchant domain's registration age and DNS. Returns risk low|medium|high|unknown with flags such as sanctioned_address, sanctioned_name_possible, new_domain. Call this before a USDC payment w
• check_token ~326 tokens
  Base contract safety signals from bounded public-chain reads and OFAC. Basic: deployed bytecode and SDN match. Deep adds standard owner(), paused(), totalSupply(), decimals() and ERC-1967 storage observations, exact ERC-1167 minimal-proxy target detection, a Sourcify runtime-verification claim match
• find_rv_stations ~279 tokens
  Nearest RV dump/water stations from FillPoint RV's dated September 17, 2026 ODbL snapshot. $0.01 for bounded straight-line proximity calculation, not live access, potable-water assurance or road routing. Snapshot age and unknown current conditions are explicit. Full underlying projection is free und
• get_service_info ~194 tokens
  Free, read-only service reference. Use when you need prices, default spending rules, payment setup, trial allowance, or a ready-to-use example call. If you already have a payment challenge or cart, call preflight_payment directly; this reference call is optional. Takes no arguments and performs no p
• lint_endpoint ~306 tokens
  Free x402 Lint by SpendPreflight. Checks a public HTTPS endpoint with an unpaid GET: v1/v2 challenge shape, payTo/asset/network syntax, price, Bazaar metadata and browser CORS headers. Returns a heuristic Listing Guard riskScore (0–100 or unknown), fixes and a public seven-day report link. Positive
• listing_guard ~247 tokens
  Bazaar Listing Guard: CDP technical validation plus a bounded heuristic metadata screen for agent-directed instructions, embedded URLs, tool calls, invisible Unicode, long fields and prices above 100x a fresh Scout category median. Returns riskScore, flagged spans and rewrite suggestions. Not Coinba
• preflight_payment ~877 tokens
  Call this before any x402/USDC payment to evaluate the actual challenge or cart before signing. Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold threshold, daily cap, allowlists, new-domain days, endpoint
• size_solar ~514 tokens
  Off-grid PV energy-balance estimate based on Wattpath by Nomad Energy Club. Supply daily loads, peak sun hours, PV losses, and optional battery assumptions. No location/weather lookup, electrical design, surge or installation certification. $0.02 per calculation; no stored inputs.

Browse

• GitHub tools
• Domains and DNS
• Payments
• GitHub and code hosting
• Weather

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