Userstack

Secure User-Agent String Lookup JSON API

Endpoint	`https://userstack.com`
Trust	100% uptime over 1 checks · ~590 ms
Pricing	See the provider
docs url	https://userstack.com/?utm_source=Github&utm_medium=Referral&utm_campaign=Public-apis-repo-Best-sellers
auth	none
source	public_apis

Use it

Endpoint

https://userstack.com

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/496

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}