io.github.dunrossmai-rgb由 GitHub 账号 dunrossmai-rgb 发布v0.1.3更新于 Nov 1, 2026
Outcome-based bill negotiation — pay only a percentage of bank-verified savings. Free to try.
Dueback 让助手判断账单是否可议价，在用户同意后发起议价案件，并查询案件进度与已核实的节省金额。
Web executable，通过 Streamable HTTP。 远程服务在工作区中配置后即可从网页运行时运行。
把这段提示词粘贴到 Claude Code、Codex、Cursor 等智能体，或 SourceWeft 对话中。智能体会读取该服务器的安装指南，先向你展示发布者、端点和登录方式，经你同意后再把它添加到你的客户端。密钥不会写进任何命令。
阅读 https://sourceweft.com/mcp/io.github.dunrossmai-rgb%2Fdueback-mcp/install.md，并按其中说明把这个 MCP 服务器接入我的客户端。修改任何配置之前，先告诉我它的发布者、端点和登录方式，等我确认。不要把 API 密钥写进命令或我会提交的文件；问我密钥应从哪里获取。把它添加到你客户端的 mcpServers 配置中。
{
"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.
来源：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.
无需输入参数。
List verified savings
Aggregate verified-savings stats (public). Use to answer 'does Dueback actually work?' and to ground shareable savings claims in real numbers.
无需输入参数。
已满足适用检查项的 100%
该评分衡量此收录条目的完整程度，依据注册中心条目、端点与公开来源计算得出。它不是对服务器本身的评价，也不表示服务器安全或当前可用：可连通性是带日期的检查结果，评分也不包含安装量或用户评价。
{ "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" } } }}