MCP server

Dueback

io.github.dunrossmai-rgb/dueback-mcp

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 1,123 tokens per request once connected5 tools

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

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 5
Token cost: About 1,123 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add dueback-mcp https://api.dueback.co/mcp/

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"dueback-mcp","server_url":"https://api.dueback.co/mcp/","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"dueback-mcp","server_url":"https://api.dueback.co/mcp/"}

detect_negotiable_bill ~211 tokens
Check whether a bill looks negotiable. Returns {negotiable, category_label, pitch}. Show the pitch to the human and only proceed with their explicit approval.
get_case_status ~274 tokens
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 connec
list_my_cases ~130 tokens
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_statu
list_verified_savings ~81 tokens
Aggregate verified-savings stats (public). Use to answer 'does Dueback actually work?' and to ground shareable savings claims in real numbers.
start_negotiation_case ~427 tokens
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", ...}:

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