ChatGPT + Mercury: What the Integration Can (and Can't) Do in 2026
Yes, ChatGPT integrates with Mercury — the startup bank shipped Mercury MCP, a hosted Model Context Protocol server, as part of its March 2026 product updates, and it connects to ChatGPT through Apps & Connectors. Once connected, you can interrogate your banking in plain English: search transactions by merchant or category, check balances across accounts, pull card and recipient details, download statements. Two things to know up front: it’s in beta, and it’s deliberately read-only — Mercury built it with OAuth, MFA, and 24-hour token expiration, and restricted it to read actions specifically so an AI model can never move your money. And like every connector in ChatGPT, it works in a session you’re driving — between chats, nothing watches your account.
Here’s what the ChatGPT Mercury integration actually does, how to turn it on, and what to use when you want banking work that runs without you.
What ChatGPT can actually do with Mercury
- Search and filter transactions. “Show me everything we paid AWS this quarter” or “list transactions over $5,000 in June” — answered from live account data with merchant, category, and user detail.
- Check balances across accounts. Checking, savings, treasury — one question instead of tab-hopping the dashboard.
- Pull statements. Ask for a PDF statement for a given month instead of digging through the statements page — useful mid-conversation with your accountant’s questions in front of you.
- Look up cards and recipients. Which cards are active, who’s set up as a payment recipient, what are the details — read out conversationally.
- Run inside agent sessions. With ChatGPT Work (launched July 9, 2026), you can @-mention connected apps and let an agent work across Mercury and the rest of your stack for a long, metered run — reconciling a quarter’s spend against your books, say. Still a run you start.
How to set it up
- Have a ChatGPT plan where connectors are available, and Mercury credentials that can authorize the connection.
- In ChatGPT, open Settings → Apps & Connectors and add Mercury — Mercury’s docs say the easiest path is through ChatGPT’s Apps & Connectors (or Claude’s Add Connectors).
- Authorize via OAuth with your Mercury login and MFA. The server is hosted by Mercury, so there’s nothing to deploy; tokens expire every 24 hours.
- Ask a banking question (“what’s our current runway across accounts?”) or invoke it explicitly with an @-mention in a prompt.
The limits that actually matter
- Read-only, by design. Mercury explicitly restricted MCP to read actions to prevent unintended transactions. ChatGPT cannot send payments, create recipients, issue cards, or move a single dollar — and given what a hallucinated wire would cost, that’s the right call.
- It doesn’t run on triggers. There’s no “when a transaction over $10,000 posts, flag it” or “when the operating account dips below two months of runway, tell me.” ChatGPT queries Mercury when you prompt it — it never fires on a banking event.
- It’s beta, and Mercury says to double-check. Mercury’s own docs tell you to verify any LLM response against your Mercury account before important decisions. Treat answers as a fast first pass, not a source of record.
- Session-bound, even in agent mode. ChatGPT Work runs are long and autonomous but manually started and metered against your plan’s allowance — an errand, not a standing watch on your cash.
If you want Mercury work that runs on its own: Carly
The moment you want something to happen off a banking event — a Friday cash-position summary emailed to the founders, a flag when a large transaction posts, a monthly burn recap that lands in Slack without anyone asking — you’ve crossed past what a read-only connector in a chat is for.
That’s where Carly fits. Carly is an AI executive assistant that acts on triggers across your whole stack, set up by conversation instead of code:
- Fires on events and schedules, 24/7, in the cloud. Large transaction posts, Friday 4pm, first of the month — Carly acts without a chat open.
- No-code setup. Tell Carly “when a transaction over $10,000 posts, flag it and notify the founder” in plain English; it interviews you and builds the workflow.
- Connects banking to the rest of your work — Mercury data flowing into email, Slack, spreadsheets, and your accounting stack in one flow.
- Actually sends — drafts and sends email across Gmail and Outlook, posts to Slack, updates sheets and tasks.
- Connects to anything — 200+ native integrations, plus any other tool via your own API key. Carly connects to Mercury with your own API key — paste it on carlyassistant.com/integrations and Carly can watch and report on your Mercury data in workflows.
AI agents start at $35/month, and steps in a workflow that don’t use AI run free and unlimited. See integrations for the full list.
ChatGPT vs Carly
| ChatGPT (Mercury MCP) | Carly | |
|---|---|---|
| Live balance and transaction queries | Yes | Yes |
| Conversational follow-up analysis | Yes | Yes |
| Weekly cash summary, unprompted | No | Yes, on a schedule |
| Flags a large transaction by itself | No | Yes, on any trigger |
| Runs without a session open | No (agent runs are started + metered) | Yes (cloud, 24/7) |
| Pushes results into inbox / Slack / sheets | No | Yes |
| Emails the report to the founders | No | Yes (Gmail + Outlook) |
| Setup | Add the connector | Describe it in plain English |
| Pricing | Paid ChatGPT plan | AI agents from $35/mo |
ChatGPT’s Mercury connector is a banking analyst you question in a chat. Carly is an assistant that watches your accounts and acts while you’re doing something else.
Frequently Asked Questions
Does ChatGPT work with Mercury?
Yes. Mercury runs a hosted MCP server, launched in beta in March 2026, that connects to ChatGPT through Apps & Connectors. Authorize it via OAuth and you can query transactions, balances, statements, cards, and recipients in plain English.
Can ChatGPT send payments or move money in Mercury?
No, and it can’t be configured to. Mercury deliberately restricted its MCP server to read-only actions to prevent unintended transactions — no payments, no new recipients, no card changes. Every response is also worth double-checking against your dashboard; Mercury says so itself.
Can ChatGPT alert me when a big transaction hits my Mercury account?
No. ChatGPT queries Mercury inside a session you start — it doesn’t watch for deposits, large debits, or balance thresholds. For “when X happens in my account, do Y,” you need a trigger-based assistant like Carly, which connects to Mercury with your own API key.
How do I connect ChatGPT to Mercury?
Open Settings → Apps & Connectors in ChatGPT, add Mercury, and authorize with your Mercury login (OAuth plus MFA; tokens expire after 24 hours). The server is hosted by Mercury, so there’s nothing to run yourself.
More: ChatGPT email assistant · ChatGPT personal assistant · ChatGPT MCP · Can ChatGPT send emails · Claude + Mercury · Best AI tools for executives
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