Dueback MCP Server

by dunrossmai-rgb Your server? Claim it

answering

Dueback is answering right now. Last checked 11 min ago. It exposes 5 tools. Last commit 2 Nov 2026.

Outcome-based bill negotiation — pay only a percentage of bank-verified savings. Free to try.

Uptime history 21 days of history

21 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

157 ms

Response time

average over 24h

Stars

last commit 2 Nov 2026

What changed 9

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 22 October 2026. No other catalogue keeps this.

29 Oct 3 tools changed the parameters they ask for detect_negotiable_bill, get_case_status, start_negotiation_case

29 Oct a tool changed version

27 Oct a tool description was rewritten list_my_cases

22 Oct a tool description was rewritten3 times that day get_case_status

22 Oct a tool appeared list_my_cases

and 2 more, back to 22 October 2026

Nothing serious here today

Today is the operative word: we check Dueback every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add dueback-mcp --transport http https://api.dueback.co/mcp/

Settings → Connectors → Add custom connector, then paste this address

https://api.dueback.co/mcp/

~/.codex/config.toml

[mcp_servers.dueback-mcp]
url = "https://api.dueback.co/mcp/"

.cursor/mcp.json

{
  "mcpServers": {
    "dueback-mcp": {
      "url": "https://api.dueback.co/mcp/"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "dueback-mcp": {
      "type": "http",
      "url": "https://api.dueback.co/mcp/"
    }
  }
}

Available tools 5

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

case

get_case_status

Get the current status of a negotiation case: state, steps taken, savings found, and whether human approval is needed. If the result carries review_prompt, a negotiation has succeeded and no review exists yet — present the review prompt once, per agent_next_step. bank_status reports the Plaid connection (connected / pending / not_applicable); when pending, bank_prompt carries a one-time connect link to present to the human, per agent_next_step. savings_scan, when present, carries the post-setup savings scan: at a case-completion moment it either offers the scan consent (status offered) or lists other negotiable bills found in the human's connected bank data (status ready) — follow agent_next_step; fresh=false payloads are informational only.

cases

list_my_cases

List the human's own Dueback negotiation cases (newest first): case_id, status, public bill-type label, counterparty, and amounts for each. Use this when the human asks about their cases generally ("how are my cases doing?") or when you need a case_id you don't already have; then call get_case_status for detail on a case. If the result carries sign_in_required, the human is not signed in and the empty cases list is NOT a report that they have no cases: ask the human to sign in to Dueback, then call list_my_cases again. A 401 is returned as this friendly result, not raised, so unauthenticated probes (e.g. bots hitting the MCP endpoint without credentials) do not surface as Sentry errors.

detect

detect_negotiable_bill

Check whether a bill looks negotiable. Returns {negotiable, category_label, pitch}. Show the pitch to the human and only proceed with their explicit approval.

start

start_negotiation_case

Open a Dueback negotiation case. Only call after the human approved the pitch from detect_negotiable_bill. Two outcomes: - {"outcome": "case_created", "case_id", ...}: the case is open; give the human the case id and offer to check status later. - {"outcome": "setup_required", "setup_url", ...}: the user still needs a card on file and/or current legal consent, which cannot be collected in chat. Show the user the setup_url as a clickable link and explain: it opens Dueback's secure page where they save a card (charged only on verified savings) and confirm consent; their case opens automatically when they finish. Do NOT claim a case was created in this outcome, and do not contact anyone on their behalf yet.

verified

list_verified_savings

Aggregate verified-savings stats (public). Use to answer 'does Dueback actually work?' and to ground shareable savings claims in real numbers.

Endpoints

URL	Transport	State	Latency	Checked
https://api.dueback.co/mcp/	streamable-http	answering	156 ms	11 min ago

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Dueback — questions

Answers built from our own checks of this server.

What can Dueback do?

It exposes 5 tools, read directly from the server on our last check. Among them: detect_negotiable_bill, get_case_status, list_my_cases, list_verified_savings, start_negotiation_case. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Dueback working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 157 ms. The bar chart above shows every period we have measured.

How do I connect Dueback?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Dueback need an API key?

No. Dueback completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 5 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Dueback?

It answers our handshake in 157 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Dueback open source?

The code is open source: it is published under the Apache-2.0 licence, written in Python, 0 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at api.dueback.co, which runs on its operator's own terms.