usefulapiChorus Pay MCP server
Read, create, update and cancel order quotes for public bodies in Chorus Pay. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the Chorus Pay connector, then ask in plain words. The AI picks the tools.
- List the Chorus Pay orders that are still waiting for the client to accept.
- Create a quote for 7 training days for a town hall, using its SIRET.
- Cancel order ord_… because the client withdrew. The client gets an email.
- Show the status and the payment link of order ord_… for the procurement team.
What you can do with Chorus Pay in Claude and ChatGPT
For suppliers that send quotes to public bodies and follow their acceptance in Chorus Pay.
Track the quotes waiting for client acceptance
List the orders that still wait for the client to accept. Open one order to read its status and client.
Copy the payment link for a procurement team
Read an order to get its Chorus Pay link and status. Pass the link to the procurement team.
Create a quote for a public body
Create an order quote in draft status. The quote is not sent to the client. Repeating the same call does not create a second quote.
Changes dataUpdate the redirect URL or metadata of an order
Change the redirect URL or the metadata of an order. Metadata keys you send are added or overwritten; other keys stay.
Changes dataCancel an order the client withdrew
Cancel an order in Chorus Pay. The client gets an email. The cancel fails once the invoice is filed on Chorus Pro.
Changes dataHow do I connect Chorus Pay?
Before you connect
The login page asks for your Chorus Pay live API key.
Create it in Chorus Pay → Paramètres → Clés API. The key is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.
Claude claude.ai · Desktop
- Open Customize → Connectors, then click + Add → Add custom connector.
- Enter the name Chorus Pay and this URL, then click Add:https://
chorus-pay. usefulapi. io/ mcp - Claude opens the login page: enter your Chorus Pay live API key.
- In a chat, click + → Connectors and turn on Chorus Pay.
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 Chorus Pay and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
chorus-pay. usefulapi. io/ mcp - ChatGPT opens the login page: enter your Chorus Pay live API key.
- In Plugins, install Chorus Pay, 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": {
"chorus-pay": {
"url": "https://chorus-pay.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"chorus-pay": {
"type": "http",
"url": "https://chorus-pay.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 Chorus Pay live 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 Chorus Pay server only. Ask your AI to run choruspay_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 choruspay_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 choruspay_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 9
Show all 9 tools (the AI picks them for you)
Read only · 2
- List orders
choruspay_list_ordersList orders (quotes) with pagination. Returns data, has_more and next_cursor. - Get an order
choruspay_get_orderGet one order by id: status, client, lines, totals and the Chorus Pay link.
Changes data · 3
- Create an order quote
choruspay_create_orderCreate an order (quote) with status draft. This tool does not send it to the client. Repeating the same call sends the same Idempotency-Key, so it does not create a second quote. - Update an order
choruspay_update_orderChange the redirect URL and/or the metadata of an order. Metadata keys you give are added or overwritten; other keys stay. - Cancel an order
choruspay_cancel_orderCancel an order that is cancelled in your shop or tool. Chorus Pay emails the client. Replaying the call is safe. Fails with 409 once the invoice is filed on Chorus Pro.
Your usefulapi plan · 4
- Usage status (free-tier meter)
choruspay_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
choruspay_request_featureTell usefulapi that the user needs something the Chorus Pay 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+
choruspay_upgradeGet a paid plan for Chorus Pay (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
choruspay_cancel_subscriptionCancel the caller's Chorus Pay 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 choruspay_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with Chorus Pay in Claude or ChatGPT?
Track the quotes waiting for client acceptance. Copy the payment link for a procurement team. Create a quote for a public body. Update the redirect URL or metadata of an order. Cancel an order the client withdrew. See what you can do for the details.
Is this an official Chorus Pay product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by Chorus Pay. The server calls the Chorus Pay API with your own Chorus Pay access, so it sees only the data that your account can see.
Can I connect Chorus Pay 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 Chorus Pay live API key. See Before you connect for where to find it.
Do I put my Chorus Pay 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 Chorus Pay live 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 Chorus Pay credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Chorus Pay 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 Chorus Pay.
Can the AI change my Chorus Pay data?
Yes, if you approve it. 3 of the 5 Chorus Pay tools can create or change data. The other 2 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
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 Chorus Pay server only. Cancel any time: your paid plan then runs to the end of the paid period. Run choruspay_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run choruspay_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 choruspay_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a Chorus Pay tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with choruspay_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.