leads_by_tech · REST + MCP

Find leads by the software they use

Build a lead list of websites that use specific software, e.g. every Shopify store using Klaviyo, or dental sites on WordPress, with each site's published phone numbers, emails and social profiles. Ask for as many as you need (default 25, up to 50); you pay only for sites returned. Filter by country and keyword. Use it to find prospects who already use (or need) what you sell.

$0.03 USD per company returned

This tool uses prepaid credit. Connect without a key and your agent will get a key and payment link when it needs this tool.

Charged per company returned. The most a call could cost is held first and the unused part is refunded at once. Failed calls are free.

Connect your agent

Use it in your chat

Start with no key

In Claude.ai, Claude Desktop, Claude Code, ChatGPT or Codex, add a custom connector with this URL. No API key or Authorization header is needed.

https://unstuckapi.com/mcp

Try a few free calls a day with read_page, domain_check, domain_info, pdf_to_text, vulnerability_lookup, or paper_search. Each free result says how many are left and when they reset (midnight UTC).

A paid tool called without a key returns a new API key and a payment link instead of a result, and nothing is charged. In Claude, a Connect button opens the same payment page. Once credit is added, the agent can continue in the same chat with that key.

Already have a key?

If your connector cannot send headers, use this URL instead. Replace YOUR_API_KEY with your key.

https://unstuckapi.com/mcp?key=YOUR_API_KEY

Keep the completed URL private: it contains your API key.

Ask your agent to call leads_by_tech with these arguments:

{
  "technologies": [
    "Shopify",
    "Klaviyo"
  ],
  "country": "US",
  "limit": 25
}

Inputs

Send these fields as a JSON object to POST /v1/tools/leads_by_tech.

Input fields for leads_by_tech
Field	Type	Description & limits
`technologies`	array of string Required	1 to 3 technology names, spelled as the product is usually named, e.g. ["Shopify"], ["WooCommerce", "Klaviyo"], ["HubSpot"]. Sites must use all of them.Minimum items: 1 · Maximum items: 3
`country`	string Optional	Two-letter country code to limit results, e.g. "US", "GB", "CA".
`keyword`	string Optional	Optional word the site's title or description should mention, e.g. "coffee" or "dental".Minimum characters: 2 · Maximum characters: 60
`limit`	integer Optional	How many sites to return, default 25, max 50.Minimum: 1 · Maximum: 50

Developer option: REST

Replace YOUR_API_KEY with your key. The following command makes a paid call if it succeeds.

export UNSTUCK_API_KEY="YOUR_API_KEY"

curl 'https://unstuckapi.com/v1/tools/leads_by_tech' \
  -H "Authorization: Bearer $UNSTUCK_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{"technologies":["Shopify","Klaviyo"],"country":"US","limit":25}'

The response contains result, charged_usd, and your remaining balance_usd. Invalid input and failed tool calls are not charged.

Developer option: MCP with a header

For clients that support headers, connect using Streamable HTTP and these values:

https://unstuckapi.com/mcp

Authorization: Bearer YOUR_API_KEY

Connection guide · Full JSON schemas and prices · Agent instructions