Overview
LeadSonar API (1.1.0)
Section titled “LeadSonar API (1.1.0)”LeadSonar API: B2B lead search, reveal and export over a 168M-contact database; AI enrichment and ICP scoring grounded in each company’s own website; domain scraping. Authenticate with the X-API-Key header (create a key in Settings > API Keys). Counting and browsing are free; reveals, exports, enrichment, ICP scores and scrapes spend credits. Human-readable docs: https://docs.leadsonar.io
Limits. Requests are limited to about 10 per second per IP (burst 20); over that you get HTTP 503 — back off and retry. One export delivers at most 50,000 rows; browse pages hold at most 1,000.
Unknown filter values return 0, not an error. Check filters in the /leads/search response, and use GET /api/v1/leads/filters?field=
Coverage. Contact data is US-only in practice (68.6M US records with a country; every other country is under 30K). Revenue bands are derived from headcount, not reported revenue.
- LeadSonar Support: https://app.leadsonar.io/docs.html - support@leadsonar.io
- OpenAPI version: 3.0.3
Authentication
Section titled “ Authentication ”ApiKeyAuth
Section titled “ApiKeyAuth ”API key starting with ls_live_
Security scheme type: apiKey
Header parameter name: X-API-Key