The Invoice Preflight x402 MCP MCP server,
connected in one click.
Invoice checks for AI agents: UBL/PDF/image, line items, evidence, free tier quote, x402 USDC. Connect the official Invoice Preflight x402 MCP MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Add Invoice Preflight x402 MCP to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http invoice-preflight-x402-mcp https://mcp.dropenginehq.com/api/paid-mcpRun in your terminal, then restart Claude Code.
Invoice Preflight x402 MCP · https://mcp.dropenginehq.com/api/paid-mcp
What your AI can do with Invoice Preflight x402 MCP
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “action_lock”: Action Lock ($0.001 USDC): Prevent duplicate side effects across agent retries, crashes, and concurrent workers. If an action has side effec.”
“Use “agent_spend_governor”: Enforce autonomous-agent budgets before paid actions. Call before spending; authorize, commit, release, or inspect an opaque reservation. Do.”
“Use “agent_permission_vault”: Check whether an owner-configured policy authorizes this capability for the verified caller. Permission check only; agents cannot grant them.”
“Use “agent_outcome_receipt”: Create or verify a tamper-evident receipt of an agent-reported outcome. It proves DropEngine recorded a claim, not that the external event i.”
How secure is the Invoice Preflight x402 MCP MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Invoice Preflight x402 MCP holds up.
Official endpoint
Operated by Invoice Preflight x402 MCP (dropenginehq.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Invoice Preflight x402 MCP adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Invoice Preflight x402 MCP
Choose Invoice Preflight x402 MCP in the gate directory. No sign-in needed.
Use it anywhere
Invoice Preflight x402 MCP's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
The actual tools Invoice Preflight x402 MCP exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
action_lock — Action Lock ($0.001 USDC): Prevent duplicate side effects across agent retries, crashes, and concurrent workers. If an action has side effec
agent_spend_governor — Enforce autonomous-agent budgets before paid actions. Call before spending; authorize, commit, release, or inspect an opaque reservation. Do
agent_permission_vault — Check whether an owner-configured policy authorizes this capability for the verified caller. Permission check only; agents cannot grant them
agent_outcome_receipt — Create or verify a tamper-evident receipt of an agent-reported outcome. It proves DropEngine recorded a claim, not that the external event i
invoice_preflight_quote — FREE, no wallet or document upload: choose the lowest priced Invoice Preflight tool from document type, PDF page count, and optional byte si
mcp_server_inspect — MCP server health check ($0.01 USDC on Base): connect to any public MCP endpoint over HTTPS, confirm it is reachable, list its tool names an
check_url — Paid Agent Preflight URL check ($0.005 USDC on Base). Call before an agent opens, follows, downloads from, or trusts an unknown URL. Perform
scan_content — Paid Untrusted Content Security Layer ($0.005 USDC on Base). Scan untrusted text, HTML, Markdown, email, document text, API responses, and t
+ 16 more tools once connected
Who runs the Invoice Preflight x402 MCP MCP server?
The Invoice Preflight x402 MCP MCP server at a glance
https://mcp.dropenginehq.com/api/paid-mcpQuestions, answered
Is there an official Invoice Preflight x402 MCP MCP server?
Yes — Invoice Preflight x402 MCP operates its own remote MCP server at mcp.dropenginehq.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Invoice Preflight x402 MCP to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Invoice Preflight x402 MCP in the directory. No account or sign-in is needed. From then on, Invoice Preflight x402 MCP's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Invoice Preflight x402 MCP runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Invoice Preflight x402 MCP MCP server safe to connect?
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Is it free?
Yes — you can get started with gate for free and connect Invoice Preflight x402 MCP in minutes. No credit card required.
Connect more than just Invoice Preflight x402 MCP
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Invoice Preflight x402 MCP in: Claude · Claude Code · ChatGPT · Cursor · VS Code
Give your AI Invoice Preflight x402 MCP — safely.
One URL. All MCPs. Full control. Free to start.
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