MCP.Market

defrr MCP server

online · 100% uptime
by defrr.com·com.defrr/defrr·v1.3.0
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RevRec schedules, renewals, credits, usage pricing. Can save contracts and renewals as drafts.

A87/100grade A
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Safety scan
A87/100

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If you have run it, two minutes of your experience saves the next person an afternoon.

defrr tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Not scanned yet. New listings are scanned within a day or two of arriving.

How defrr compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
87/100
higher than 73% of 48,255 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
321 ms
faster than 45% of 30,031 servers

Release history: 3 versions in the registry since 2026-10-20, latest 2026-10-27, typically one every 4 days.

Install defrr in Claude Code, Cursor or VS Code

claude mcp add --transport http defrr https://defrr.com/v1/mcp
Add to Cursor

What the publisher says

From the defrr repository's README, as published. We do not edit it. Read it on GitHub

defrr MCP server

Revenue recognition (RevRec) schedules, waterfalls, renewals, credits, cancellations and usage pricing for contracts, worked out by defrr's engine. Connect it to Claude Code and ask in plain English, or call it from your own code.

The calculation tools store nothing, and nothing you send to them is logged. If you want, you can also switch on saving contracts to your defrr organization (see below). That is off by default and set per key.

Connect

  1. Create an API key at https://defrr.com/developers/account (40 free credits).
  2. Add the server:
claude mcp add --transport http defrr https://defrr.com/v1/mcp \
     --header "Authorization: Bearer dfr_live_YOUR_KEY"
  1. In Claude Code, type /mcp. defrr should show 9 tools for a key that only calculates, or 12 or 14 for a key that can also save contracts (see below).

Tools

These calculate and store nothing. They work for every key.

A call that fails is refunded.

Saving contracts to defrr (optional)

By default the tools above only calculate: the schedule comes back to you and nothing is kept. If you want contracts recorded in your defrr organization, create a key with Save contracts in Defrr ticked on your developer account. If you don't have a defrr workspace yet, the page sets up a small one for you (company name, base currency, how revenue is recognised and, if you like, the month your books are locked through). A key without that option can only calculate.

A saved contract is a draft. It isn't live, and no report reads it, until it is approved: in defrr under Contracts, Draft contracts, or by an agent whose key also has the approve option. Leave the approve option off for an agent you want a person to check. If a draft has revenue in months you have closed (your locked period in Organization details), or in months that have already ended, defrr says so before it is approved.

Repeats are safe. Sending the same agreement again returns the draft already saved and costs nothing, while that draft is waiting or approved. If it was rejected, or its contract has since been deleted, the same terms save as a new draft. Send an idempotencyKey to save a separate deal with identical terms.

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

defrr: common questions

Is defrr MCP server safe?
Yes, by our scan: it is graded A (87/100). Read the defrr safety report
How do I install defrr?
It runs remotely at defrr.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does defrr need an API key?
Yes. The registry entry asks for Authorization.
Is defrr maintained?
The last commit was 10 days ago (2026-10-25). The latest release is v1.3.0.
Is defrr up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
How does defrr compare with other MCP servers?
safety score 87/100 (higher than 73% of 48,255 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 321 ms (faster than 45% of 30,031 servers). Full comparison.