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Bloomerang API and MCP server

Bloomerang's Zapier app cannot merge duplicates, read a donor's gift history or filter lapsed donors. Sign in to Bloomerang once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with Bloomerang.

Bloomerang has no API for this. So we run one for you.

Bloomerang's own API, a GitHub MCP server and Cotlet compared
What you need Bloomerang's APIGitHub MCP serverCotlet
Duplicate merges, gift history, lapsed lists No No Yes, 12 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Bloomerang changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 22, 2026. Sources: Bloomerang: API · Bloomerang: REST API documentation · Zapier: Bloomerang triggers and actions · Bloomerang Help: User Permissions

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to Bloomerang in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Bloomerang to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 12 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. Bloomerang and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/bloomerang with its own method and path, such as POST /api/v1/bloomerang/constituents/{constituent_id}/donations, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Bloomerang API and MCP server do?

12 tools on your own Bloomerang account. Agents call them as operations of the MCP tools bloomerang_read and bloomerang_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Bloomerang tools in Cotlet's MCP server and REST API
Tool What it does Access
search_constituents Find constituents by name or account number, with the dashboard filters. read
get_constituent Read one constituent profile with contact details and giving status. read
list_donations List the gifts on a constituent timeline. read
list_interactions List calls, emails and notes logged for a constituent. read
list_giving_options List the fund, campaign and appeal names your database uses. read
list_duplicates List the pairs Bloomerang flagged as possible duplicate constituents. read
create_constituent Add an individual or organization, unless the same person is already there. write
update_constituent Change contact details on an existing constituent. write
add_interaction Record a call, email, meeting or note on a constituent timeline. write
create_task Create a follow-up task for a staff member on a constituent. write
record_donation Record a gift that already arrived by cash, check, in kind or an outside payment service. writeasks first
merge_constituents Merge a duplicate into the record you keep. writeasks first

Scroll the table for all 12 tools.

Ask in plain words. Your agent does the rest.

All Bloomerang use cases

Is it safe to connect Bloomerang?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the Bloomerang API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while Bloomerang is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does Bloomerang have an API?

Yes, Bloomerang has a REST API for server-to-server integrations, but no MCP server for AI agents (checked 22 Oct 2026). An administrator creates the private key in User Settings under Edit My User, and that key can change any data in the database. Bloomerang also has a Zapier app with 7 triggers, 6 actions and 2 searches.

How do I get access?

Sign up free, open Bloomerang under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 12 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to Bloomerang yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Bloomerang sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: record_donation, merge_constituents wait for your OK by default. You can switch that off per tool for scheduled runs.

Which Bloomerang role does my agent need?

The role of the account you sign in with. A standard user whose Transactions permission is View only cannot add gifts, and No access cannot view them. The Duplicate Constituents page is for admins; a standard user can merge by default, but not without the Data Tools permission. A call without the role fails with APP_PERMISSION_DENIED.

Can my agent charge a card or refund a gift?

No. record_donation only records gifts that already arrived by Cash, Check, In Kind or an outside payment service, and Credit Card, EFT and Saved Payment are refused because they process a payment in Bloomerang. No tool refunds or deletes a gift; Bloomerang has its own Refund or Delete Donations steps in the app.

Do I need a Bloomerang API key?

No. Cotlet works in your signed-in Bloomerang account and does not use the private REST API key, which an administrator creates in User Settings and which can change any data in the database.

Should I use a Bloomerang MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when Bloomerang changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with Bloomerang?

No. Cotlet is independent and not affiliated with Bloomerang.

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