Bill4Time MCP server

Read Bill4Time clients, projects, time entries, expenses, invoices, payments, users and contacts. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Bill4TimeFree 50 calls/mo

What can I ask?

Turn on the Bill4Time connector, then ask in plain words. The AI picks the tools.

How many billable hours did we log last month, by person?
Which invoices are still unpaid, and for which clients?
Show the time entries for Acme Ltd from this week.
What expenses did we record last month, and for which clients?

What you can do with Bill4Time in Claude and ChatGPT

For law firms and other professional-service firms that track time and billing in Bill4Time.

Total the billable hours by person for a period

The AI lists time entries filtered by user and entry date range, with billable time and amount, and adds them up per timekeeper.

Find unpaid invoices and the clients behind them

The AI lists invoices by status and paid status, with client, totals and invoice date, and shows which clients still owe.

Review time entries for a client or matter

The AI lists the time entries of a client or project with date, user, activity, rate, billing status and description.

Review expenses by client and billing status

The AI lists expenses filtered by client, project, date range or billing status, with cost, sell price and type, and sums them up.

Check the payments you received

The AI lists payments with client, project, amount, date and method, filtered by client, project or payment date range.

Look up clients, matters and contacts

The AI lists clients, projects (matters) and contacts, filtered by status or creation date, with their basic details.

How do I connect Bill4Time?

Before you connect

The login page asks for your Bill4Time API key.

Create it in Bill4Time under Settings → API tab. Use a v1 key. The key gives read access to your firm's billing data; this server only reads, and returns no private notes unless you ask. Your key is used only to call the Bill4Time API on your behalf; it is never shown to anyone. Delete the key in Bill4Time to disconnect.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name Bill4Time and this URL, then click Add:
https://bill4time.usefulapi.io/mcp
Claude opens the login page: enter your Bill4Time API key.
In a chat, click + → Connectors and turn on Bill4Time.

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 Bill4Time and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://bill4time.usefulapi.io/mcp
ChatGPT opens the login page: enter your Bill4Time API key.
In Plugins, install Bill4Time, 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:

claude mcp add --transport http bill4time https://bill4time.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "bill4time": {
      "url": "https://bill4time.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "bill4time": {
      "type": "http",
      "url": "https://bill4time.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add bill4time --url https://bill4time.usefulapi.io/mcp

codex mcp login bill4time

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.

https://bill4time.usefulapi.io/mcp

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 Bill4Time 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 API key	$9/mo · $90/yr	10,000 tool calls / month
Pro+per API key	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Bill4Time server only. Ask your AI to run bill4time_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 bill4time_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 bill4time_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 12

Show all 12 tools (the AI picks them for you)

Read only · 8

List clientsbill4time_list_clients
List clients (id, name, billing name, email, phone, city, account manager, status, billing rate type, currency). Filter by status, exact client name, id or creation date. Street addresses and tax ids are not returned.
List projects (matters)bill4time_list_projects
List projects (matters): id, name, client, status, billing method, rate overrides, assigned user, created/closed/due dates. Filter by status, billing method, client, id or creation date.
List time entriesbill4time_list_time_entries
List time entries: client, project, user, entry date, billable and labor time, billable amount, rate, activity, ABA litigation code, billing status, invoice id, public description. Filter by client, project, user, invoice, entry date range or billing status. Private notes and contractor pay rates are not returned unless include_private_notes is set.
List expensesbill4time_list_expenses
List expenses: client, project, user, expense date, cost and sell price, quantity, type, billing status, invoice id, public description. Filter by client, project, user, invoice, expense date range, billing status or exact expense type. Private notes are not returned unless include_private_notes is set.
List invoicesbill4time_list_invoices
List invoices: client, project, invoice date, status (prebill or finalized), paid status, totals (invoice, labor, expense, late fee), terms and notes. Filter by status, paid status, client, project, id or invoice date range.
List paymentsbill4time_list_payments
List payments: client, project, amount, date, type, method, public note. Filter by client, project, id or payment date range. Check numbers are not returned; the private note only with include_private_notes.
List users (timekeepers)bill4time_list_users
List the firm's users: name, email, user type, status, department, position, billing and overtime rate. Birth dates, addresses, phone numbers and contractor pay rates are not returned. Filter by status or id.
List contactsbill4time_list_contacts
List contacts: name, email, work and mobile phone, city, status, creation date. Filter by status, id or creation date. Street addresses, home phone and notes are not returned.

Your usefulapi plan · 4

Usage status (free-tier meter)bill4time_usage_status
Report 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 featurebill4time_request_feature
Tell usefulapi that the user needs something the Bill4Time 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+bill4time_upgrade
Get a paid plan for Bill4Time (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 subscriptionbill4time_cancel_subscription
Cancel the caller's Bill4Time 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 bill4time_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Bill4Time in Claude or ChatGPT?

Total the billable hours by person for a period. Find unpaid invoices and the clients behind them. Review time entries for a client or matter. Review expenses by client and billing status. Check the payments you received. Look up clients, matters and contacts. See what you can do for the details.

Is this an official Bill4Time product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Bill4Time. The server calls the Bill4Time API with your own Bill4Time access, so it sees only the data that your account can see.

Can I connect Bill4Time 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 Bill4Time API key. See Before you connect for where to find it.

Do I put my Bill4Time 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 Bill4Time 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 Bill4Time credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Bill4Time 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 Bill4Time.

Can the AI change my Bill4Time data?

All 8 Bill4Time 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 Bill4Time server only. Cancel any time: your paid plan then runs to the end of the paid period. Run bill4time_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run bill4time_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 bill4time_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Bill4Time tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with bill4time_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.

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