Ipxapi Blog: #1 Accurate IP Address Lookup and Geolocation API

An IP blacklist check API tells you whether an address appears on major email/IP blocklists before you accept a signup or send mail. On ipXapi that is GET https://ipxapi.com/api/blacklist-check?ip= with Authorization: Bearer. The documented example IP is 8.8.8.8 (IPv4 required). Basic is $29.99/mo with a 7-day trial or 50 requests. This is not GET /api/ip (city/ASN) and not /api/fraud-score. MCP: https://mcp.ipxapi.com (the path ipxapi.com/mcp 404s). Docs: quick-start on ipxapi.com. Request: check 8.8.8.8 curl 'https://ipxapi.com/api/blacklist-check?ip=8.8.8.8' \ -H 'Accept: application/json' \ -H 'Authorization: Bearer YOUR_KEY' Response fields (product fixture) Feature tests cach...