Dueback

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io.github.dunrossmai-rgb/dueback-mcpv0.1.2

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

Finance & Payments

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

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detect_negotiable_bill Read-only

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

expense_descriptionstring, required

amount_centsstring

counterpartystring

observed_signalsstring

Tools (5)

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.

read-only

Argument	Type	Description
amount_cents	any
counterparty	any
observed_signals	any
expense_description*	string

Input schema (JSON)

{
  "type": "object",
  "title": "detect_negotiable_billArguments",
  "required": [
    "expense_description"
  ],
  "properties": {
    "amount_cents": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "title": "Amount Cents",
      "default": null
    },
    "counterparty": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "title": "Counterparty",
      "default": null
    },
    "observed_signals": {
      "anyOf": [
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        {
          "type": "null"
        }
      ],
      "title": "Observed Signals",
      "default": null
    },
    "expense_description": {
      "type": "string",
      "title": "Expense Description"
    }
  }
}

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.

read-only

Argument	Type	Description
case_id*	string

Input schema (JSON)

{
  "type": "object",
  "title": "get_case_statusArguments",
  "required": [
    "case_id"
  ],
  "properties": {
    "case_id": {
      "type": "string",
      "title": "Case Id"
    }
  }
}

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.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "title": "list_my_casesArguments",
  "properties": {}
}

list_verified_savings

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

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "title": "list_verified_savingsArguments",
  "properties": {}
}

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.

Argument	Type	Description
amount_cents	any
counterparty	any
billing_period	string
automatic_change	boolean
observed_signals	any
expense_description*	string

Input schema (JSON)

{
  "type": "object",
  "title": "start_negotiation_caseArguments",
  "required": [
    "expense_description"
  ],
  "properties": {
    "amount_cents": {
      "anyOf": [
        {
          "type": "integer"
        },
        {
          "type": "null"
        }
      ],
      "title": "Amount Cents",
      "default": null
    },
    "counterparty": {
      "anyOf": [
        {
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "title": "Counterparty",
      "default": null
    },
    "billing_period": {
      "type": "string",
      "title": "Billing Period",
      "default": "unknown"
    },
    "automatic_change": {
      "type": "boolean",
      "title": "Automatic Change",
      "default": false
    },
    "observed_signals": {
      "anyOf": [
        {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        {
          "type": "null"
        }
      ],
      "title": "Observed Signals",
      "default": null
    },
    "expense_description": {
      "type": "string",
      "title": "Expense Description"
    }
  }
}