Abstract API MCP server

Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Abstract API50 free tool calls a month

What can I ask?

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

Is jane.smith@example.com a valid email address, and is it disposable?
What is the VAT rate in Germany, including reduced rates?
Convert 2,500 euros to US dollars at today's rate.
Is December 25 a public holiday in Spain this year, and what is it called?

What you can do with Abstract API in Claude and ChatGPT

For business teams and developers who check customer and company data with Abstract API.

Check an email address or a phone number

The AI checks an email for deliverability, disposable or role flags and breaches, or a phone number for carrier, line type, location and risk.

Check a VAT number or an IBAN

The AI checks whether a VAT number is valid and returns the registered company name and address, or checks the structure and check digits of an IBAN.

Work out a price with or without VAT

The AI calculates the amount without VAT, the VAT amount and the rate for a country, or works backwards from a price with VAT. It can also list a country's VAT rates.

Convert an amount between currencies

The AI converts an amount at the latest rate or at a past date, and lists exchange rates for a base currency.

Look up an IP address or a company by domain

The AI reads location and VPN, proxy, Tor and abuse flags of an IP, or firmographic data of a company domain: industry, size, address and social profiles.

Check public holidays and local times

The AI lists public holidays of a country for a date, month or year, gets the local time of a place, and converts a time between two places.

How do I connect Abstract API?

Before you connect

The login page asks for your Abstract API credentials.

Optional: Email Reputation API key, Phone Intelligence API key, IP Intelligence API key, Company Enrichment API key, IBAN Validation API key, VAT Validation API key, Exchange Rates API key, Public Holidays API key and Timezone API key.

Every Abstract API has its own key (an Email Reputation key does not work for IP Intelligence). Open the API in your Abstract dashboard (app.abstractapi.com) and copy its key. Credits: connecting makes one test request per key, and every tool call spends one credit of that API's plan (free plans have a monthly quota and 1 request per second). A tool for an API whose key you left empty answers with a clear message; connect again to add it. Your keys are used only to call Abstract on your behalf; they are never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name Abstract API and this URL, then click Add:
https://abstract-api.usefulapi.io/mcp
Claude opens the login page: enter your Abstract API credentials.
In a chat, click + → Connectors and turn on Abstract API.

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

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name Abstract API and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://abstract-api.usefulapi.io/mcp
ChatGPT opens the login page: enter your Abstract API credentials.
In Plugins, install Abstract API, 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 abstract-api https://abstract-api.usefulapi.io/mcp

Cursor

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

{
  "mcpServers": {
    "abstract-api": {
      "url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}

VS Code

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

{
  "servers": {
    "abstract-api": {
      "type": "http",
      "url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}

Codex

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

codex mcp add abstract-api --url https://abstract-api.usefulapi.io/mcp

codex mcp login abstract-api

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://abstract-api.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 Abstract API credentials. 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

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper user	$9/mo · $90/yr	10,000 tool calls / month
Pro+per user	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Abstract API server only. Ask your AI to run abstractapi_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 abstractapi_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 abstractapi_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 18

Show all 18 tools (the AI picks them for you)

Read only · 14

Validate emailabstractapi_validate_email
Check one email address: deliverability (format, MX, SMTP), quality score, free/disposable/role/catch-all flags, sender details and known data breaches. Email Reputation API. Spends 1 credit of your Email Reputation plan per request (a failed request counts too); needs the Email Reputation API key.
Look up phone numberabstractapi_lookup_phone
Validate and enrich one phone number: format, carrier, line type (mobile, landline, VoIP), location, line status, risk and known breaches. Phone Intelligence API. Spends 1 credit of your Phone Intelligence plan per request (a failed request counts too); needs the Phone Intelligence API key.
Look up IP addressabstractapi_lookup_ip
Geolocation and security intelligence for one IPv4 or IPv6 address: VPN/proxy/Tor/hosting/abuse flags, ASN, company, location, timezone, flag and currency. IP Intelligence API. An explicit ip_address is required (without one Abstract would look up the caller's own address, which here is this server's). Spends 1 credit of your IP Intelligence plan per request (a failed request counts too); needs the IP Intelligence API key.
Enrich companyabstractapi_enrich_company
Firmographic data for a company web domain: name, description, logo, address, industry (SIC/NAICS), employee and revenue ranges, contacts, social profiles, technologies. Company Enrichment API. Spends 1 credit of your Company Enrichment plan per request (a failed request counts too); needs the Company Enrichment API key.
Validate IBANabstractapi_validate_iban
Check the structure and check digits of one International Bank Account Number. It does not prove that the account exists. IBAN Validation API. Spends 1 credit of your IBAN Validation plan per request (a failed request counts too); needs the IBAN Validation API key.
Validate VAT numberabstractapi_validate_vat
Check whether a VAT number is valid and, if it is, return the registered company name and address. VAT Validation API. Spends 1 credit of your VAT Validation plan per request (a failed request counts too); needs the VAT Validation API key.
Calculate VATabstractapi_calculate_vat
Work out the VAT-compliant price for an amount in a country: the amounts without and with VAT, the VAT amount and the rate. Set is_vat_incl to true for the reverse calculation (the amount already contains VAT). VAT Validation API. Spends 1 credit of your VAT Validation plan per request (a failed request counts too); needs the VAT Validation API key.
List VAT ratesabstractapi_list_vat_rates
The latest VAT rates of one country: the standard rate and each reduced-rate category with its description. VAT Validation API. Abstract answers this endpoint without checking the key and may not count it as a credit; this tool still needs the VAT API key.
Get exchange ratesabstractapi_get_exchange_rates
Latest foreign-exchange and cryptocurrency rates for a base currency against one or more targets (all supported currencies if none is given). Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.
Convert currencyabstractapi_convert_currency
Convert an amount from a base currency to one target currency, at the latest rate or at the rate of a past date. Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.
Get historical exchange ratesabstractapi_get_historical_rates
Exchange rates of a base currency on a past date. Abstract lists this endpoint as closed beta: a key may be refused (HTTP 401/403) until Abstract enables it. Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.
Get public holidaysabstractapi_get_holidays
Public, local and religious holidays of a country for a date, a month or a year. Free Abstract plans require year, month and day together; paid plans default missing values to today. Public Holidays API. Spends 1 credit of your Public Holidays plan per request (a failed request counts too); needs the Public Holidays API key.
Get current timeabstractapi_get_current_time
The current local date, time and timezone (name, abbreviation, GMT offset, daylight saving) of a place, coordinates or IP address. Timezone API. Spends 1 credit of your Timezone plan per request (a failed request counts too); needs the Timezone API key.
Convert time between locationsabstractapi_convert_time
Convert a date and time from one location to another (places, coordinates or IP addresses). Without base_datetime the current time is converted. Timezone API. Spends 1 credit of your Timezone plan per request (a failed request counts too); needs the Timezone API key.

Your usefulapi plan · 4

Usage status (free-tier meter)abstractapi_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 featureabstractapi_request_feature
Tell usefulapi that the user needs something the Abstract API 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+abstractapi_upgrade
Get a paid plan for Abstract API (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 subscriptionabstractapi_cancel_subscription
Cancel the caller's Abstract API 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 abstractapi_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Abstract API in Claude or ChatGPT?

Check an email address or a phone number. Check a VAT number or an IBAN. Work out a price with or without VAT. Convert an amount between currencies. Look up an IP address or a company by domain. Check public holidays and local times. See what you can do for the details.

Is this an official Abstract API product?

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

Can I connect Abstract API 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 Abstract API credentials. See Before you connect for where to find it.

Do I put my Abstract API 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 Abstract API credentials. 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 Abstract API credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Abstract API 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 Abstract API.

Can the AI change my Abstract API data?

All 14 Abstract API tools are marked read-only.

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 Abstract API server only. Cancel any time: your paid plan then runs to the end of the paid period. Run abstractapi_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run abstractapi_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 abstractapi_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Abstract API tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with abstractapi_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.

More Data & Analytics MCP servers

All Data & Analytics servers →