usefulapiMoonClerk MCP server
Read MoonClerk payment forms, customers (plans with subscriptions) and payments. Read-only. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the MoonClerk connector, then ask in plain words. The AI picks the tools.
- Which MoonClerk plans are past due right now?
- List the payments that failed this month.
- Which subscriptions are due to bill next week?
- How much has each of my payment forms collected?
What you can do with MoonClerk in Claude and ChatGPT
For small businesses and nonprofits that collect payments and subscriptions with MoonClerk.
Find plans that are past due
The AI lists customers (plans) filtered by status, such as past due, unpaid or canceled, with plan amount, interval and next payment date.
List failed or refunded payments
The AI lists payments filtered by status and charge date, with amount, Stripe fee, refunded amount, payer and form.
See which subscriptions bill next week
The AI lists plans filtered by next-payment date range and sums up the amounts due.
Compare how much each payment form collected
The AI lists the payment forms with payment volume and successful checkout count, so you can compare them.
Read one plan or payment in detail
The AI opens one customer plan, with subscription, discount and custom field answers, or one payment, with refunds, payer and coupon.
How do I connect MoonClerk?
Before you connect
The login page asks for your MoonClerk API key.
Get the key in MoonClerk under Settings → API Key (app.moonclerk.com/settings/api-key). It gives read access to all customer and payment data of the account. Your key is used only to call the MoonClerk API on your behalf; it is never shown to anyone.
Claude claude.ai · Desktop
- Open Customize → Connectors, then click + Add → Add custom connector.
- Enter the name MoonClerk and this URL, then click Add:https://
moonclerk. usefulapi. io/ mcp - Claude opens the login page: enter your MoonClerk API key.
- In a chat, click + → Connectors and turn on MoonClerk.
Team and Enterprise: an Owner adds the connector for the organization first.
ChatGPT chatgpt.com
- Open Plugins, click +, then Add custom MCP server.
- Enter the name MoonClerk and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
moonclerk. usefulapi. io/ mcp - ChatGPT opens the login page: enter your MoonClerk API key.
- In Plugins, install MoonClerk, then choose it in a chat.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Claude Code
Run this command, then run /mcp in Claude Code to log in:
Cursor
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"moonclerk": {
"url": "https://moonclerk.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"moonclerk": {
"type": "http",
"url": "https://moonclerk.usefulapi.io/mcp"
}
}
} Codex
Run these commands. The second one opens the login page:
Other clients
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your MoonClerk API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
Pricing
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per user | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this MoonClerk server only. Ask your AI to run moonclerk_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with moonclerk_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with moonclerk_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 10
Show all 10 tools (the AI picks them for you)
Read only · 6
- List payment forms
moonclerk_list_formsList the MoonClerk payment forms: id, title, currency, payment_volume (cents), successful_checkout_count and created/updated times. Use the form ids to filter customers (plans) and payments. Read-only. - Get payment form
moonclerk_get_formOne payment form by id: title, currency, payment volume and checkout count. Read-only. - List customers (plans)
moonclerk_list_customersList MoonClerk customers, which the MoonClerk web app calls "Plans": each is one payer with their subscription (status, plan amount and interval, next payment date, trial and cancel dates), payment method (brand, last 4), coupon discount, custom form fields and the form they used. Filter by form, status (active, canceled, expired, past_due, pending, unpaid), sign-up date range or next-payment date range, e.g. past_due plans or renewals due this month. The payer's management link and checkout token are never returned. Read-only. - Get customer (plan)
moonclerk_get_customerOne MoonClerk customer (plan) by id with the full subscription, payment method, discount, checkout amounts (subtotal, fee, total, upfront amount, trial days) and custom field answers. The payer's management link and checkout token are never returned. Read-only. - List payments
moonclerk_list_paymentsList MoonClerk payments (charges): date, status (successful, refunded, failed), amount, Stripe fee and amount refunded in cents, currency, payer name and email, payment method, form, customer id (recurring payments only), coupon and custom fields. Filter by form, customer, status or charge-date range, e.g. failed payments this month or refunds for one plan. Amounts are in cents. Read-only. - Get payment
moonclerk_get_paymentOne MoonClerk payment by id with amounts (cents), Stripe fee, refunds, payer, payment method, Stripe references (charge, customer, invoice), coupon, custom fields and one-time checkout data. The checkout token is never returned. Read-only.
Your usefulapi plan · 4
- Usage status (free-tier meter)
moonclerk_usage_statusReport the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter. - Request a missing feature
moonclerk_request_featureTell usefulapi that the user needs something the MoonClerk tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. - Upgrade to Pro or Pro+
moonclerk_upgradeGet a paid plan for MoonClerk (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter. - Cancel the Pro subscription
moonclerk_cancel_subscriptionCancel the caller's MoonClerk Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run moonclerk_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with MoonClerk in Claude or ChatGPT?
Find plans that are past due. List failed or refunded payments. See which subscriptions bill next week. Compare how much each payment form collected. Read one plan or payment in detail. See what you can do for the details.
Is this an official MoonClerk product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by MoonClerk. The server calls the MoonClerk API with your own MoonClerk access, so it sees only the data that your account can see.
Can I connect MoonClerk to Claude or ChatGPT?
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
What do I need to connect?
The login page asks for your MoonClerk API key. See Before you connect for where to find it.
Do I put my MoonClerk key or an Authorization header in the client config?
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your MoonClerk API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
How do you keep my MoonClerk credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the MoonClerk API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in MoonClerk.
Can the AI change my MoonClerk data?
All 6 MoonClerk tools are marked read-only.
What does it cost?
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this MoonClerk server only. Cancel any time: your paid plan then runs to the end of the paid period. Run moonclerk_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run moonclerk_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run moonclerk_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a MoonClerk tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with moonclerk_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Which AI clients can I use?
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.