MX Institutions (BYOK)

MX Institutions (BYOK) — connector documentation

• MCP endpoint: https://byok-mx-institutions.connectorbay.com/mcp
• REST API: POST https://byok-mx-institutions.connectorbay.com/v1/tools/{tool_name}, described by the OpenAPI 3.1 spec at https://byok-mx-institutions.connectorbay.com/openapi.json
• Transport: Streamable HTTP, stateless, MCP specification 2025-06-18 or later
• Authentication: your own MX Institutions MX client id, sent in the X-Upstream-Key header and the MX API key in X-Upstream-Key-2 of every request (never stored, logged or cached)
• Health: https://byok-mx-institutions.connectorbay.com/health · Tool schemas: https://byok-mx-institutions.connectorbay.com/tools.json
• Publisher: Unify Dynamics LLC · connectorbay.com/byok-mx-institutions · agent@connectorbay.com

What MX Institutions (BYOK) is for

MX Institutions (BYOK) lets an AI assistant read your own MX Institutions data through the MX Institutions API with a key you supply (MX client id). Read-only: 8 tools (list_institutions, get_institution, list_institution_credentials, list_favorite_institutions, list_default_categories, get_default_category, list_merchants, get_merchant). The BYOK key travels with each request, is used for that one call only and is never stored, logged or cached; it is only ever sent to api.mx.com. Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by MX Institutions. MX Institutions and its logos are trademarks of their owners and are used only to say which service the connector works with.

Ask your assistant things like:

• "Which MX institutions with mxbank in the name support account verification?"
• "What does MX support for the institution with code mxbank?"
• "Which sign-in fields does MX ask for at the institution with code mxbank?"
• "Which institutions are my MX favorites?"
• "What default transaction categories does MX offer?"
• "What is the MX default category CAT-7829f71c-2e8c-afa5-2f55-fa3634b89874?"

What it does

• list_institutions: Search the MX directory of banks and credit unions by name with the features each supports (account verification, transaction history, OAuth, statements, tax documents) and country.
• get_institution: Get one institution from the MX directory by its code with the features it supports and its country.
• list_institution_credentials: List the sign-in fields (labels and field types only, no values) MX asks for when connecting to one institution.
• list_favorite_institutions: List the institutions your MX account has marked as favorites, most popular first, with supported features.
• list_default_categories: List the default MX spending and income categories and subcategories with parent links.
• get_default_category: Get one default MX category by guid with its name, parent and whether it counts as income.
• list_merchants: Search the MX merchant directory by name, with logo and website.
• get_merchant: Get one merchant from the MX directory by guid with its name, logo and website.

BYOK key

You bring your own MX Institutions MX client id (https://dashboard.mx.com). Your assistant sends it in the X-Upstream-Key header with each request. ConnectorBay uses it for that one call only: it is never stored, logged or cached, never shown in an answer, and it is only sent to api.mx.com over https, with no redirects followed. Create a key with the fewest permissions the tools need (read-only if the provider offers it), and revoke it at the provider whenever you like.

Data sources

• https://docs.mx.com/api-reference/platform-api/overview/ (the API this connector calls, with a BYOK key)

Live from the MX Institutions API (api.mx.com) with a BYOK key; documentation: https://docs.mx.com/api-reference/platform-api/overview/. Endpoints checked against that documentation on 2026-10-16.

What it is not

Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by MX Institutions. MX Institutions and its logos are trademarks of their owners and are used only to say which service the connector works with. It is read-only: it never creates, changes, sends or deletes anything in your MX Institutions account.

Built for: Worldwide. Languages: English.

MX Institutions (BYOK) — Privacy Policy

Effective 24 October 2026. Unify Dynamics LLC ("we", "us"), Menlo Park, California.

What MX Institutions (BYOK) is. MX Institutions (BYOK) is a connector (an MCP server and REST API) that an AI assistant calls on your behalf to read your own MX Institutions data: Browse the MX Platform bank and credit union directory, default spending categories and merchant directory with your own MX client id and API key. You bring your own MX Institutions MX client id; the assistant sends it to us with each request.

BYOK key. The key you supply is used to make the one MX Institutions call you asked for. Our application does not store it, write it to a log, put it in a cache, or share it. It is sent only to api.mx.com, over https, and is removed from any text we return to you or your assistant. We do not follow redirects with your key. If MX Institutions rejects it, we say so without repeating it.

What we receive. The arguments of each tool call, the BYOK key (for that call only), the technical headers needed to serve the request (an IP address or a client identifier supplied by the assistant) and standard server logs. What MX Institutions receives. The request we make on your behalf, including the key and the arguments, under MX Institutions's own terms and privacy policy. MX Institutions acts at your direction and is the only recipient of the data of your request besides our hosting provider.

What we return. The answer MX Institutions gives for your request, trimmed to the fields the tool documents. We do not keep it: it is returned to your assistant and not stored, cached or used to train anything.

What we do not do. We do not build a profile, sell or share personal information, or keep your MX Institutions data. Rate-limit counters (a client identifier and timestamps) are held in memory for at most 24 hours. Hosting access logs (IP addresses, request paths and status codes) are kept for up to 30 days for security and abuse prevention; our application adds no request headers or bodies to them.

Sub-processors. MX Institutions (the API you call with a BYOK key, at your direction). Hosting: Vercel (United States regions).

Your rights. Because we store no personal data beyond short-lived logs, requests to access, correct or delete data are usually satisfied automatically; you can still contact agent@connectorbay.com and we will respond within 30 days. Revoke your key at MX Institutions at any time to end all access.

Children. MX Institutions (BYOK) is a general-audience service operated by the adult using the assistant, under MX Institutions's own age rules.

Changes. We will post changes here with a new effective date.

MX Institutions (BYOK) — Terms of Service

Effective 24 October 2026. These terms govern use of the MX Institutions (BYOK) connector ("the Service") operated by Unify Dynamics LLC ("we", "us").

1. The Service. MX Institutions (BYOK) provides: Browse the MX Platform bank and credit union directory, default spending categories and merchant directory with your own MX client id and API key. It is accessed through an AI assistant or directly over MCP or HTTP, and is read-only.
2. Your own key, your own account. You must use your own MX Institutions credentials and only access data you are allowed to access. MX Institutions's terms apply to your use of MX Institutions; you are responsible for complying with them, including any rate limits and permitted uses. Do not share a key you do not own.
3. Independent. Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by MX Institutions. MX Institutions and its logos are trademarks of their owners and are used only to say which service the connector works with.
4. No advice, no guarantees. Output is the data MX Institutions returns, lightly trimmed; it may be incomplete, delayed or changed by MX Institutions. Check important facts at the source.
5. Read-only. The Service does not create, change, send or delete anything in your MX Institutions account.
6. Acceptable use. Automated use within the published rate limits is welcome. Do not use the Service to access data you are not entitled to, to circumvent MX Institutions's controls, or to attack any system.
7. Availability. The Service is provided "as is" without warranty. We may change, limit or discontinue it at any time; MX Institutions may change or end its API at any time.
8. Data. Our Privacy Policy describes what we process. In short: the BYOK key is used for the one call and not stored or logged.
9. Pro keys. Optional ConnectorBay Pro API keys are issued at our discretion and are separate from your MX Institutions key.
10. Liability. To the fullest extent permitted by law, Unify Dynamics LLC is not liable for any loss arising from use of or reliance on the Service, including any action MX Institutions takes on your account. Our total liability is limited to US $100.
11. Governing law. California law; venue in San Mateo County, California.
12. Contact. Unify Dynamics LLC · agent@connectorbay.com · https://connectorbay.com/byok-mx-institutions

MX Institutions (BYOK) support

Email agent@connectorbay.com. We answer within two business days.

• MCP endpoint: https://byok-mx-institutions.connectorbay.com/mcp
• REST API: https://byok-mx-institutions.connectorbay.com/openapi.json
• Live status: https://byok-mx-institutions.connectorbay.com/health

When you report a problem, include the question you asked your agent, roughly when, and which agent you used (for example Claude, ChatGPT or Gemini). Never send us passwords, account numbers or ID numbers. MX Institutions (BYOK) never asks for them.