usefulapiLittle Green Light MCP server
Search Little Green Light donors, gifts, notes and memberships, and add gifts and contact reports. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the Little Green Light connector, then ask in plain words. The AI picks the tools.
- Which gifts did we receive last month and from whom?
- Show me Jane Smith's complete giving history.
- Does Acme Ltd have an active membership, and when does it end?
- Log a contact report that I met Jane Smith for coffee today.
What you can do with Little Green Light in Claude and ChatGPT
For nonprofit fundraisers and development staff who manage donors in Little Green Light.
Look up a donor and their giving history
The AI searches constituents by name, email or other terms, opens one record, and lists every gift with amount, date, fund, campaign and appeal.
Find gifts received in a period
The AI searches gifts by date range, amount, fund or campaign and shows who gave what. It sums up the total.
Check if a member is current or lapsed
The AI reads a constituent's memberships with level, start date and finish date, so you can see if the membership is current.
Prepare for a donor meeting
The AI reads a constituent's notes and contact reports (calls, emails, meetings) and sums up the history of contact with them.
Record a gift or log a contact report
The AI records a gift that already happened on a constituent, or logs a call, email or meeting as a contact report. It does not charge a card.
Changes dataHow do I connect Little Green Light?
Before you connect
The login page asks for your Little Green Light API key.
In Little Green Light go to Settings → Integration settings → LGL API. An account administrator generates the key there. If you don't see the LGL API link, API access isn't enabled for your account yet — ask LGL support (support@littlegreenlight.com) to turn it on. Your key is used only to call the LGL 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 Little Green Light and this URL, then click Add:https://
little-green-light. usefulapi. io/ mcp - Claude opens the login page: enter your Little Green Light API key.
- In a chat, click + → Connectors and turn on Little Green Light.
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 Little Green Light and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
little-green-light. usefulapi. io/ mcp - ChatGPT opens the login page: enter your Little Green Light API key.
- In Plugins, install Little Green Light, 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": {
"little-green-light": {
"url": "https://little-green-light.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"little-green-light": {
"type": "http",
"url": "https://little-green-light.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 Little Green Light 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 Little Green Light server only. Ask your AI to run lgl_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 lgl_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 lgl_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 24
Show all 24 tools (the AI picks them for you)
Read only · 15
- Search constituents
lgl_search_constituentsSearch active constituents (donors, members, volunteers, organizations). Give `name` and/or `email` for the common case, or raw `terms`. Available term fields: name, eaddr (email contains), phone_number, street, city, state (2-letter), postal_code, country, keyword (keyword id), updated_from / updated_to (YYYY-MM-DDTHH:MM:SSZ), membership_status (0 lapsed, 1 active), membership_level (comma-separated ids), membership_end_date_from / _to (YYYY-MM-DD), external_id, constituent_type (0 individual, 1 organization), groups (comma-separated group ids), lists (comma-separated list ids), custom_attr (key|op|value). At least one term is required. - Get a constituent
lgl_get_constituentFull details for one constituent by LGL id: names, salutations, addresses, phone numbers, email addresses, groups, memberships and custom attributes. - List a constituent's gifts
lgl_list_constituent_giftsA constituent's giving history: every gift with amount, date, gift type, fund, campaign, appeal, event and payment type. - Search gifts
lgl_search_giftsSearch active gifts across the account — e.g. everything received in a date range, or gifts to one fund or campaign. Give date/updated bounds and/or raw `terms`. Available term fields: date_from / date_to (YYYY-MM-DD), gift_types (in|ni + comma ids, e.g. in|1,7), gift_amount (gte|lte|btw|gt|lt|eq|ne + number[s], e.g. btw|100|1000), payment_types, campaigns, funds, appeals, events, categories (in|ni|bl + comma ids), appeal_types, event_types, constituent_type (0/1), gift_ids, external_gift_ids, created_from / created_to and updated_from / updated_to (YYYY-MM-DDTHH:MM:SSZ). At least one term is required. - Get a gift
lgl_get_giftFull details for one gift by id: amount, deductible amount, dates, fund/campaign/appeal/event, payment type, acknowledgment template, tribute and custom fields. - List a constituent's notes
lgl_list_constituent_notesNotes recorded on a constituent (type, text, original date). - List a constituent's contact reports
lgl_list_constituent_contact_reportsContact reports (calls, emails, meetings) logged for a constituent, with type, date, text and team member. - List a constituent's memberships
lgl_list_constituent_membershipsA constituent's memberships: level, start date and finish date — use it to see whether someone is current or lapsed. - List appeals
lgl_list_appealsFundraising appeals (mailings, emails, asks) with campaign, date, financial goal, cost and active flag. Use the ids and names when recording gifts or filtering searches. - List campaigns
lgl_list_campaignsCampaigns with start/end dates, financial goal, code and active flag. Use the ids and names when recording gifts or filtering searches. - List funds
lgl_list_fundsFunds (where gifts are designated) with campaign, code, financial goal and active flag. Use the ids and names when recording gifts or filtering searches. - List events
lgl_list_eventsEvents (galas, lunches, board weekends) with dates, campaign, event type, goal and active flag. Use the ids and names when recording gifts or filtering searches. - List groups
lgl_list_groupsConstituent groups (e.g. Board Member, Staff, Volunteer) with their ids and keys. Use the ids and names when recording gifts or filtering searches. - List team members
lgl_list_team_membersLGL user accounts on the team (name, email, admin flag) — the values a gift or contact report's team_member refers to. Use the ids and names when recording gifts or filtering searches. - List lookup values
lgl_list_type_valuesThe account's configured lookup values for one type — the ids and names other tools accept. gift_types, payment_types and gift_categories come from their own endpoints (GET /api/v1/gift_types, /payment_types, /gift_categories — the last optionally filtered by gift_type_id); every other type from GET /api/v1/types/{type} (contact_report_types, note_types, appeal_types, event_types, email/phone/street/web address types, mailing_types, volunteering_categories, list_types).
Changes data · 5
- Create a constituent
lgl_create_constituentWRITE: add a new constituent (person or organization) to the account, optionally with email addresses, phone numbers, street addresses and group memberships. LGL's schema marks first_name, last_name and email_addresses as required. Search first (lgl_search_constituents) to avoid creating a duplicate. - Update a constituent
lgl_update_constituentWRITE: change scalar fields on an existing constituent (name, salutation, job title, org name, deceased flag, etc.). Only the fields you pass are sent. LGL's update schema marks first_name and last_name as required, so pass the current values (from lgl_get_constituent) if you are not changing them. Addresses, emails and phones are not edited here. - Record a gift
lgl_create_giftWRITE: record a gift (donation, pledge payment, in-kind, etc.) on a constituent's record. This writes a CRM record of a gift that already happened — it does NOT charge a card or move money. Give gift_type_id or gift_type_name (required; see lgl_list_type_values type=gift_types). Fund, campaign, appeal, event, gift category and payment type may each be given by id or by exact name. Set ack_template_name to 'do_not_ack' to skip acknowledgment. - Add a note
lgl_create_noteWRITE: add a note to a constituent's record. text and original_date are required; the note type may be given by id or name (e.g. 'General'; see lgl_list_type_values type=note_types). - Log a contact report
lgl_create_contact_reportWRITE: log a contact report (a call, email or meeting with a constituent). text is required; the type may be given by id or name (e.g. 'Call'; see lgl_list_type_values type=contact_report_types).
Your usefulapi plan · 4
- Usage status (free-tier meter)
lgl_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
lgl_request_featureTell usefulapi that the user needs something the Little Green Light 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+
lgl_upgradeGet a paid plan for Little Green Light (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
lgl_cancel_subscriptionCancel the caller's Little Green Light 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 lgl_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with Little Green Light in Claude or ChatGPT?
Look up a donor and their giving history. Find gifts received in a period. Check if a member is current or lapsed. Prepare for a donor meeting. Record a gift or log a contact report. See what you can do for the details.
Is this an official Little Green Light product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by Little Green Light. The server calls the Little Green Light API with your own Little Green Light access, so it sees only the data that your account can see.
Can I connect Little Green Light 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 Little Green Light API key. See Before you connect for where to find it.
Do I put my Little Green Light 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 Little Green Light 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 Little Green Light credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Little Green Light 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 Little Green Light.
Can the AI change my Little Green Light data?
Yes, if you approve it. 5 of the 20 Little Green Light tools can create or change data. The other 15 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 Little Green Light server only. Cancel any time: your paid plan then runs to the end of the paid period. Run lgl_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run lgl_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 lgl_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a Little Green Light tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with lgl_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.