SheetRelay: make your Google Sheet an API

SheetRelay turns a Google Sheet into an API. You connect a spreadsheet once, and from then on an AI assistant like Claude or ChatGPT can read and update rows in conversation, while your own code or an automation tool can do the same over plain HTTP. Your data stays in your Google Sheet.

No. Connecting a sheet and using it with an AI assistant is point and click: you pick the spreadsheet, review what is being exposed, and paste one address into Claude or ChatGPT. The REST API is there for when you or a developer want it, not because you need it.

No. Rows are read from your Google Sheet when a call asks for them and are not stored afterwards. SheetRelay keeps your column names, types and a small sample used to describe the data, nothing more. Close your account and the access is handed back.

Yes, at three levels. Each tab has its own read, add, change and delete switches. Each key can be narrower still, down to specific tabs, columns and even rows on Pro and Team. Columns you mask never leave the server, so an assistant is never told they exist.

Gemini in Sheets helps the person who has the spreadsheet open: it writes formulas, fills cells and answers questions inside the file. SheetRelay does the opposite job. It makes the sheet reachable from outside, so the assistant you already use, a script, or a no-code tool can read and write it without anyone opening the file or being given access to it. You also get things a chat sidebar cannot offer: per-tab permissions, hidden columns, keys you can revoke, and a log of every call.

You can, but a direct connection is all or nothing: anything you let open the spreadsheet can read every tab, every column and every row in it, and with edit access it can change any of them. SheetRelay shapes that access instead, so an agent gets exactly the tabs, columns and verbs you chose and nothing else. New tabs start read-only, each tool carries its own key you can revoke on its own, and every call is logged with the reason anything was refused. If you would rather it never touched your Google account at all, share one spreadsheet with a SheetRelay address, the way you would share it with a colleague.

Anything that speaks MCP, which includes Claude, Claude Code, ChatGPT custom connectors and Cursor. Claude and ChatGPT sign in through SheetRelay and receive a short-lived pass instead of holding a key, and you can disconnect them at any time.

It can write. Read, add, change and delete are four separate switches on every tab, so a spreadsheet can be read-only, or accept new rows without allowing edits, or anything in between. New tabs start read-only until you say otherwise.

No. The description an assistant reads is built from your tab descriptions and column names, never from the contents of your cells. A row that says “ignore your previous instructions” is just a row of text. Errors are also uniform, so an unknown address, a wrong key and a refused key all answer identically and the system cannot be probed for what exists.

In your Google Sheet. SheetRelay stores your column names, types and a small sample used to describe the data, and keeps keys as one-way fingerprints rather than as keys. Data and processing are located in the EU.

Free covers two spreadsheets and 1,000 calls a month with no card. Paid plans start at $9 a month, and every plan stops at its monthly allowance instead of billing overage, so the invoice is always the plan price.