AI Expense Watchdog
Find cost leaks hiding in your business.
Scans expenses, subscriptions, vendor payments, and credit card transactions to flag unusual increases, duplicate tools, and potential savings.
Planning disclaimer
These workflows are for planning, forecasting, and decision support only. They are not accounting, tax, legal, payroll compliance, or financial advice.
What you need to build this
Connect these tools, give the AI this data, expect these outputs.
Connect
APIs & tools to set up
OAuth, API keys, or webhooks depending on the tool.
Gather
Data sources to pull from
Give to AI
Inputs per run
- 90 days credit card and bank transactions
- Recurring charge detection list
- Prior month expense categories for comparison
- Known essential vs discretionary vendor list
- Employee count for per-seat SaaS sanity check
Expect
AI outputs
- New subscriptions detected this quarter
- Vendors with >10% month-over-month increase
- Duplicate tool categories (e.g., two project management apps)
- Estimated monthly savings per recommendation
- Prioritized action list with cancellation difficulty rating
Business problem
SMBs accumulate SaaS subscriptions, vendor creep, and duplicate tools over years — nobody audits spending until margins compress unexpectedly.
Expected outcome
Monthly expense audit report flagging: new recurring charges, price increases >10%, duplicate software, unused subscriptions, and estimated monthly savings if addressed.
Who it's for: Owners who haven't reviewed expenses line-by-line in 6+ months and suspect they're paying for tools nobody uses.
Required data sources
- Credit Card TransactionsView access method →
- Bank TransactionsView access method →
- InvoicesView access method →
- Fixed CostsView access method →
- SpreadsheetsView access method →
What data goes into the AI
- 90 days credit card and bank transactions
- Recurring charge detection list
- Prior month expense categories for comparison
- Known essential vs discretionary vendor list
- Employee count for per-seat SaaS sanity check
What the AI should output
- New subscriptions detected this quarter
- Vendors with >10% month-over-month increase
- Duplicate tool categories (e.g., two project management apps)
- Estimated monthly savings per recommendation
- Prioritized action list with cancellation difficulty rating
APIs needed to automate this
- Plaid APIAuth & setup →
- QuickBooks APIAuth & setup →
- Google Sheets APIAuth & setup →
- OpenAI APIAuth & setup →
System behavior
- Monthly scheduled scan
- Read-only — never cancels subscriptions automatically
- Groups merchants intelligently (e.g., AWS variants)
- Compares to prior periods, not arbitrary benchmarks
- Savings estimates are directional, not guaranteed
No-code vs low-code vs custom
No-code
Lowest effort
Non-technical owners, quick validation, under 50 runs/day
3 options listed
Low-code
Medium effort
Operators comfortable with Zapier/n8n, need more control
3 options listed
Custom build
Highest effort
High volume, custom logic, or strict data privacy requirements
4 options listed
| No-code options | Low-code options | Custom build stack |
|---|---|---|
| Mint/QuickBooks expense export + ChatGPT audit | n8n monthly: Plaid transactions → OpenAI categorization → report | Plaid transaction ingestion |
| Ramp or Brex spend report + GPT analysis | Zapier + QBO expense sync + GPT flagging | Recurring charge detection algorithm |
| Monthly spreadsheet review ritual with Claude | Google Sheets expense log with GPT anomaly column | OpenAI for vendor grouping and duplicate detection |
| — | — | Monthly email report with savings estimate |
Start with no-code to validate the workflow. Move to low-code when you hit rate limits or need branching logic. Custom build when volume, privacy, or integration depth requires it.
Step-by-step implementation
- 1Connect bank/credit card via Plaid or accounting export
- 2Run first-month baseline to catalog all recurring charges
- 3Tag essential vs discretionary vendors with owner
- 4Set alert thresholds for MoM increases
- 5Review monthly report and action top 3 savings items
- 6Re-run quarterly for vendor contract renewal timing
Risks and limitations
- False positives on legitimate one-time purchases
- Cancelling wrong subscription can disrupt operations
- Shared vendor accounts may look like duplicates
- Not a substitute for accountant-led expense review
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