Taggun MCP server

Scan receipts with Taggun OCR from a URL or file and read receipt-validation campaigns. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Taggun50 free tool calls a month

What can I ask?

Turn on the Taggun connector, then ask in plain words. The AI picks the tools.

What you can do with Taggun in Claude and ChatGPT

For finance and expense teams who read receipts and invoices with Taggun OCR.

Read the data of a receipt or invoice from a link

The AI scans a receipt or invoice at a public https URL (JPEG, PNG, GIF, HEIC or PDF) and returns merchant, date, total, tax and, in verbose mode, line items.

Changes data

Read the data of a receipt sent as file data

The AI scans a small receipt image or PDF given as base64 text and returns merchant, date, total and tax for your expense entry.

Changes data

Check a receipt against a validation campaign

The AI scans a receipt at a URL and checks it against the rules of a stored campaign. You get pass or fail with reasons.

Changes data

Review the rules of a validation campaign

The AI lists the campaigns on the account and reads the rules of one: dates, merchants, products, fraud checks and SmartValidate prompts.

Export the product categories, merchants or product codes

The AI reads the reference data of the account as CSV: the category list, known merchants with locations, or expected product codes.

How do I connect Taggun?

Before you connect

The login page asks for your Taggun API key.

Your key is emailed when you sign up and is always in your Taggun account dashboard (taggun.io/account). Every scan this server runs counts against your own Taggun quota and plan (free for the first 30 days or 1,000 scans, then billed per scan by Taggun). Your key is used only to call the Taggun API on your behalf; it is never shown to anyone.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name Taggun and this URL, then click Add:
    https://taggun.usefulapi.io/mcp
  3. Claude opens the login page: enter your Taggun API key.
  4. In a chat, click + → Connectors and turn on Taggun.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name Taggun and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://taggun.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your Taggun API key.
  4. In Plugins, install Taggun, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http taggun https://taggun.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "taggun": {
      "url": "https://taggun.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "taggun": {
      "type": "http",
      "url": "https://taggun.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add taggun --url https://taggun.usefulapi.io/mcp
codex mcp login taggun

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://taggun.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Taggun API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Proper user$9/mo · $90/yr10,000 tool calls / month
Pro+per user$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this Taggun server only. Ask your AI to run taggun_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with taggun_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with taggun_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 10

Show all 10 tools (the AI picks them for you)

Read only · 3

  • List validation campaignstaggun_list_campaigns
    List the ids of the receipt-validation campaigns stored on your Taggun account (an empty list is normal). Does not use a scan. Needs the Campaign Validation feature; without it Taggun answers that the feature must be enabled.
  • Get a validation campaign's rulestaggun_get_campaign
    The stored validation rules of one campaign (dates, merchants, products, fraud checks, SmartValidate prompts). Does not use a scan.
  • Export account reference data (CSV)taggun_export_reference_data
    Read the reference data stored on your Taggun account as CSV: product_categories (the category taxonomy), known_merchants (merchant names and locations used for matching) or product_codes (expected product codes). Read-only; does not use a scan. The text is cut at 40,000 characters.

Changes data · 3

  • Scan a receipt or invoice from a URLtaggun_scan_receipt_url
    WRITE: this scan counts against YOUR Taggun quota and plan (free for the first 30 days or 1,000 scans, then billed per scan by Taggun), even if the receipt fails validation; it is never retried automatically. Document content is not logged by this server. Extract structured data (merchant, date, total, tax, and in verbose mode line items) from a receipt or invoice at a public https URL (JPEG, PNG, GIF, HEIF/HEIC or PDF up to 5 pages, max 20 MiB). The URL must be a public host name: no IP addresses, localhost, internal names, credentials or non-default ports.
  • Scan a receipt or invoice from base64 datataggun_scan_receipt_base64
    WRITE: this scan counts against YOUR Taggun quota and plan (free for the first 30 days or 1,000 scans, then billed per scan by Taggun), even if the receipt fails validation; it is never retried automatically. Document content is not logged by this server. Extract structured data from a receipt or invoice sent as base64 (JPEG, PNG, GIF, HEIF/HEIC or PDF; the base64 text is capped at 2,000,000 characters, about 1.5 MB of file; for larger files use taggun_scan_receipt_url).
  • Validate a receipt against a stored campaigntaggun_validate_receipt_campaign_url
    WRITE: this scan counts against YOUR Taggun quota and plan (free for the first 30 days or 1,000 scans, then billed per scan by Taggun), even if the receipt fails validation; it is never retried automatically. Document content is not logged by this server. Scan a receipt at a public https URL and check it against the rules of a campaign stored on your Taggun account (dates, merchants, products, balance owing, fraud checks). Returns pass/fail with reasons. Needs the Campaign Validation feature on your Taggun plan; use taggun_list_campaigns for the ids. Same URL rules as taggun_scan_receipt_url.

Your usefulapi plan · 4

  • Usage status (free-tier meter)taggun_usage_status
    Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
  • Request a missing featuretaggun_request_feature
    Tell usefulapi that the user needs something the Taggun tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
  • Upgrade to Pro or Pro+taggun_upgrade
    Get a paid plan for Taggun (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
  • Cancel the Pro subscriptiontaggun_cancel_subscription
    Cancel the caller's Taggun Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run taggun_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Taggun in Claude or ChatGPT?

Read the data of a receipt or invoice from a link. Read the data of a receipt sent as file data. Check a receipt against a validation campaign. Review the rules of a validation campaign. Export the product categories, merchants or product codes. See what you can do for the details.

Is this an official Taggun product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Taggun. The server calls the Taggun API with your own Taggun access, so it sees only the data that your account can see.

Can I connect Taggun to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your Taggun API key. See Before you connect for where to find it.

Do I put my Taggun key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Taggun API key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my Taggun credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Taggun API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Taggun.

Can the AI change my Taggun data?

Yes, if you approve it. 3 of the 6 Taggun tools can create or change data. The other 3 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Taggun server only. Cancel any time: your paid plan then runs to the end of the paid period. Run taggun_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run taggun_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run taggun_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Taggun tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with taggun_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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