MCP Overview

This page gets you from nothing to your first lookup in about ten minutes. You do not need a developer, and you do not need an API key. You sign in with the login you already use for the client portal.

What it does

Once connected, your AI assistant can call Accurate Append on your behalf. You ask in ordinary English and the assistant picks the right service. It can:

find a phone number, email address or demographic profile for a person, or find the person behind a phone or email
tell you whether a phone number is live and whether an email address will deliver
look up a short list of people in one go
tell you how many matches you have used
if your account has batch products, send a whole list to the batch queue and fetch the results when they are ready

You pay per match, the same way you already pay for the API. When we have nothing on a person, a lookup is free. That rule covers lookups only, one at a time or in a list. Verifying a phone or email counts as a match every time, whatever the answer.

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Requires API access on your account
The connector uses the API access already on your account, and it signs you in with your client portal login. It does not work with a trial key. If you are on a trial or your account does not have API access yet, schedule a quick chat and we will get you set up.

Connect

You connect once. After that the connector is just there. Accurate Append is a remote MCP server at https://mcp.accurateappend.com, so any assistant that supports MCP can use it. Pick your platform.

These are the steps Anthropic publishes for custom connectors in Claude on the web and in the desktop app.

Open Customize, then Connectors.
Click + and choose Add custom connector.
Paste https://mcp.accurateappend.com as the URL. Leave everything else alone.
Click Add. A sign-in page opens. Sign in with your Accurate Append portal login and approve the request.
In a new chat, click the + button near the message box, open Connectors, and switch Accurate Append on.

This is the path we have tested end to end.

Run this once in a terminal:

claude mcp add --transport http accurate-append https://mcp.accurateappend.com

Start a session, type /mcp, pick accurate-append and choose Authenticate.
Your browser opens the sign-in page. Sign in, approve, and come back to the terminal.

Do this in a real terminal window rather than a script, because the sign-in needs one.

Try it

Three quick asks, in one chat, to prove the connection works.

"Is [email protected] a valid email address?" You should hear back that the address is valid. This bills one match.
"Find a phone number for" someone from your own list, with their name and mailing address. If we have a match you get the number and pay for one match. If we do not, you pay nothing.
"How much have I used through the connector?" The assistant reports your usage. This is free.

If all three come back as described, you are set up.

What you can ask

You never need to name a tool. Ask for what you want and the assistant chooses. This is what it can choose from, and what each costs.

Ask for	Cost
A phone, email or demographics for a person, or the person behind a phone or email	One match for each phone number, email address, demographic set or reverse record returned. No match, no charge.
Whether a phone number is real and connected	Counts as one match every time. A second when the number turns out to be connected.
Whether an email address is valid and deliverable	Counts as one match every time. A second when you ask about deliverability and get a definite answer.
The same lookup for a short list of people	Each person bills like a single lookup.
How many matches you have used	Free.
Your batch products and what columns they need	Free. Shows only if your account has batch products.
Send a list to the batch queue	Billed as the job runs, the same as uploading through the portal.
The status of a batch job and a link to its output	Free.

Your account and access

Sign in once. The assistant stays signed in. You will not be asked again unless you disconnect.
Everything bills the account you signed in as. Each answer includes a short note saying what that call cost. It is a convenience, not the bill. Your invoice is the record.
You can tell connector traffic apart. Calls made through an assistant carry their own calling application on your transaction records.
To disconnect, remove the connector from your assistant's connector settings. That stops new calls. To have access revoked completely, contact support and we will do it from our side.

When it does not work

Find your symptom.

The sign-in page says username or password incorrect. Use your client portal login, the one for clients.accurateappend.com. Too many wrong tries lock the account, so stop and reset your password rather than guessing.
The connector will not add. Check the URL is exactly https://mcp.accurateappend.com. Do not add a key or change any other setting.
The sign-in page never opens, or the connection hangs. A managed office network may block the connection. Ask your IT team to allow mcp.accurateappend.com.
Sign-in worked, but every ask fails with a message about a rejected credential. Your account does not have API access set up yet. Schedule a quick chat and we will turn it on.
The assistant can see Accurate Append but the batch tools are missing. Your account does not have a batch product set up yet. Schedule a quick chat to get set up.
Claude Code says authentication is required. Type /mcp again in a real terminal window and sign in.
A charge you did not expect. Verifying a phone or email counts as a match every time, even when the answer is "not valid". Lookups count only on a match. Ask the assistant to show your usage to see the breakdown.

If none of those fit, email [email protected] or call 833-663-1919, and include what you asked and what came back. Prefer to talk it through? Schedule a quick chat.