# 44API — MCP server on mcp.ai
> Connect your 44API account and use 4 tools for taxes straight from your AI agent. Connect with your own API key. 44API validates VAT and tax identifiers, returns available company details, and manages account IP whitelists.

By: mcp.ai · official
Page: https://mcp.ai/44api

## Connect (MCP protocol)
Remote MCP endpoint (HTTP, streamable): https://api.mcp.ai/p_44api?ms=1787291520000
Add it as a custom/remote MCP connector, then authenticate when prompted.

## REST API (no MCP client required)
Every tool is also a REST endpoint, authed with a workspace API key.
Discover: GET https://api.mcp.ai/api/44api/_endpoints   # public; lists every endpoint
Call:     POST https://api.mcp.ai/api/44api/<endpoint>
  Authorization: Bearer sk_live_…   # create one at https://mcp.ai/settings/api-keys
  Content-Type: application/json
  Body: { …args }   →   { "ok": true, "tool": "<id>", "result": { … } }

## Developer docs
How to use (MCP or REST), markdown: https://mcp.ai/44api/skill.md
Postman collection (v2.1): https://mcp.ai/44api/postman.json

## Tools
- 44api_add_whitelisted_ip(email: string, ip_address: string) — Add one IPv4 or IPv6 address to the account whitelist using a verification email address. Requires an Enterprise 44API plan. The request contract is documented, but a successful addition has not been 
- 44api_list_whitelisted_ips() — List IP addresses currently allowed by the account whitelist. This operation requires an Enterprise 44API plan; the API rejects lower-tier accounts.
- 44api_remove_whitelisted_ip(ip_address: string) — Remove one IPv4 or IPv6 address from the account whitelist. This destructive operation changes account access controls and requires an Enterprise 44API plan. The shared whitelist endpoint's Enterprise
- 44api_validate_vat_number(vat_number: string, country_code: string) — Validate one VAT or tax ID for a supported country and return its validity plus any company details available on the connected plan.

## Example prompts
- "What can I do in 44API?"
- "Show me a summary of my 44API account"

## Links
Docs: https://mcp.ai/docs/mcps/44api
Website: https://mcp.ai/mcps/44api