io.github.dunrossmai-rgb由 GitHub 帳號 dunrossmai-rgb 發布v0.1.3更新於 Nov 1, 2026
Outcome-based bill negotiation — pay only a percentage of bank-verified savings. Free to try.
Dueback 讓助理判斷帳單是否可議價，在取得使用者同意後開立議價案件，並查詢案件進度與已核實的節省金額。
Web executable，透過 Streamable HTTP。 遠端服務在工作區中設定後即可從網頁執行環境執行。
把這段提示詞貼上到 Claude Code、Codex、Cursor 等代理程式，或 SourceWeft 對話中。代理程式會讀取該伺服器的安裝指南，先向你展示發布者、端點和登入方式，經你同意後再把它新增到你的客戶端。金鑰不會寫進任何命令。
閱讀 https://sourceweft.com/mcp/io.github.dunrossmai-rgb%2Fdueback-mcp/install.md，並按其中說明把這個 MCP 伺服器接入我的客戶端。修改任何設定之前，先告訴我它的發布者、端點和登入方式，等我確認。不要把 API 金鑰寫進命令或我會提交的檔案；問我金鑰應從哪裡取得。把它新增到你客戶端的 mcpServers 設定中。
{
"mcpServers": {
"dueback": {
"type": "http",
"url": "https://api.dueback.co/mcp/"
}
}
}Give any MCP-compatible AI agent the ability to negotiate bills on behalf of its user — via Dueback.
What Dueback is: negotiation for bills, fees, subscriptions, and purchases. Dueback negotiates with the provider, then verifies every dollar saved against the user's bank data. Free to try — the user pays only a share of verified savings. If there's no verified saving, the user pays $0.
Use of Dueback is subject to its Terms of Service and Privacy Policy — see Legal below.
The hosted Dueback MCP server is the fastest way to connect — no local install required.
https://api.dueback.co/mcp/Example client configuration:
One-click install:
[Install in VS Code] [Install in Cursor]
Prefer to run a local server over stdio? See Local (stdio) server below.
No install and no API key needed — the detection tool is keyless. These two calls exercise the live server end to end:
Responses stream as SSE data: lines. The detection result's text content
is JSON shaped like this (the same object also appears under
structuredContent):
The remote server exposes five tools:
OAuth-capable clients don't need a key at all (see above). If your client needs an API key, you can create one yourself in about a minute:
Then pass it to your MCP client as a Bearer token for
https://api.dueback.co, or set it as DUEBACK_API_KEY for the local
stdio server (below). Never share the key or commit it to a repo.
Questions, or a signup that gets stuck? Email [email protected].
Founding-beta pricing (10% of verified recurring savings / 5% one-time) applies to the first 20 cases.
An agent using these tools must follow this flow before starting any
negotiation — it is also written into the start_negotiation_case
tool description:
detect_negotiable_bill and share the result.Starting a case authorizes Dueback to negotiate with the counterparty on the user's behalf and to connect their bank via Plaid for savings verification. Never start cases speculatively or in the background.
This repo also includes a thin stdio wrapper (server.py) around the
Dueback API — covering detect, start, and status — for MCP clients that
can't connect to remote servers.
Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):
Omit DUEBACK_API_KEY to run detection-only. Optionally set
DUEBACK_API_BASE to point at a non-production API.
https://api.dueback.co
and never logged.Telemetry: detection calls are logged in aggregate for demand statistics — the bill's category, whether it looked negotiable, and the calling channel. Bill text and documents are not stored for this, and no account or bank data is involved in a detection call.
Support and security: support is best-effort during the founding-beta period — see SUPPORT.md. Security vulnerabilities are reported privately per SECURITY.md, never as public issues.
Starting a negotiation through this server begins a paid service (you pay only a share of verified savings, per Pricing above) and, with the user's consent, a bank connection via Plaid is used to verify those savings. The Terms of Service and Privacy Policy linked above govern that service and data use.
來源：README.md，提交 ba5da21
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.
amount_centscounterpartyobserved_signalsexpense_description必填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.
amount_centscounterpartybilling_periodautomatic_changeobserved_signalsexpense_description必填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.
case_id必填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.
無需輸入參數。
List verified savings
Aggregate verified-savings stats (public). Use to answer 'does Dueback actually work?' and to ground shareable savings claims in real numbers.
無需輸入參數。
已滿足適用檢查項的 100%
該評分衡量此收錄條目的完整程度，依據註冊中心條目、端點與公開來源計算得出。它不是對伺服器本身的評價，也不表示伺服器安全或目前可用：可連通性是帶日期的檢查結果，評分也不包含安裝量或使用者評價。
{ "mcpServers": { "dueback": { "url": "https://api.dueback.co/mcp/" } }}# 1. Initialize a sessioncurl -s https://api.dueback.co/mcp/ \ -H 'Content-Type: application/json' \ -H 'Accept: application/json, text/event-stream' \ -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"smoke-test","version":"1.0"}}}'
# 2. Call the keyless detection toolcurl -s https://api.dueback.co/mcp/ \ -H 'Content-Type: application/json' \ -H 'Accept: application/json, text/event-stream' \ -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"detect_negotiable_bill","arguments":{"expense_description":"Comcast internet bill went up $20/month","counterparty":"Comcast"}}}'{ "negotiable": true, "category_label": "internet bill", "pitch": "This looks like an internet bill we can negotiate. Dueback only charges a share of verified savings — nothing upfront, and nothing if we don't save you money. Want me to open a case?", "agent_next_step": "The human has not approved yet. Show the pitch and ask whether to proceed. ..."}git clone https://github.com/dunrossmai-rgb/dueback-mcp.gitcd dueback-mcppython -m venv .venv && .venv/bin/pip install -r requirements.txtDUEBACK_API_KEY=dbk_your_key_here .venv/bin/python server.py{ "mcpServers": { "dueback": { "command": "/path/to/dueback-mcp/.venv/bin/python", "args": ["/path/to/dueback-mcp/server.py"], "env": { "DUEBACK_API_KEY": "dbk_your_key_here" } } }}