Coresignal

Coresignal is a data-as-a-service provider that sells company, employee and job-posting records collected from public web sources through REST APIs, flat-file datasets and a no-code self-service dashboard. Its docs describe a database of 4.5B+ records across company, employee and jobs data, exposed through Search, Collect, Bulk Collect, webhook and real-time endpoints, plus an Agentic Search API that takes natural-language queries for LLM pipelines. The buyer is an engineering or data team building its own product or pipeline; there is no CRM, sequencing or point-and-click prospecting layer, and reviewers note it offers little value without engineers.

Where it wins is a documented developer path and transparent packaging. The docs include a quickstart, API playgrounds, a rate-limit reference, llms.txt and llms-full.txt exports, an MCP server for Claude/Cursor, and published monthly credit plans from $49 (2,500 credits) to $5,000 (10M credits) with a time-limited free trial and no sales call to begin. The employee and company APIs support Elasticsearch-style query DSL, and the jobs dataset is refreshed more often than the company data.

Where it loses is ecosystem, freshness and contact depth. No official language SDKs, OpenAPI spec page or Postman collection were found in the docs index. Third-party reviews describe monthly refresh cycles on company data, no direct-dial phone numbers, and records that need normalization before use. The public status page tracks three components (CDAPI, RTAPI, self-service) and on the verification date showed the Real-Time API timing out because of an upstream data source, though it also lists scheduled maintenance transparently. No contractual uptime SLA is published for self-serve plans. Net: a credible raw-data API for builders who will do their own normalization; not a turnkey enrichment tool.