Explorium vs TheirStack

Explorium provides B2B data and infrastructure for AI agents and go-to-market workflows, including account discovery, enrichment, event tracking and research. Its Generate Accounts & Prospects API builds targeted lists using filters such as company size, website keywords and technologies. Enrichment APIs cover firmographics, workforce trends, professional profiles, and company and personal contact information. The Events API tracks real-time developments such as partnerships and product launches; the AI Research API accepts natural-language queries to generate ideal customer profiles and insights. Listed coverage includes 146M+ business entities, 767M+ professional profiles, 90M+ geospatial datapoints and 4000+ data signals. Delivery options include native integrations, API or MCP access, and customized bulk data drops. AgentSource v2 includes matching, enrichment, research, events, webhooks, asynchronous jobs and credit-usage endpoints. A free trial provides 100 credits valid for 90 days. Paid packages include Lite at $29.99, paid once, with 500 credits valid for 12 months and no rollover.

TheirStack helps sales and marketing teams find companies that may need what they sell, using job postings as clues to company needs. Users can search companies by technology use across a catalog of more than 33,000 technologies, or filter job postings for keywords tied to their software’s use cases. The job-postings API covers 250 million jobs across 195 countries since 2021 and searches 362,000 other websites alongside named job boards.

The web app includes job and company search, company lookup, list enrichment, CSV or Excel exports, and daily or weekly email alerts. API plans add job search, company search, technographics and buying-intent endpoints, webhooks, and an MCP server for AI assistants. Integrations include Zapier, Make, N8N, Airtable, and contact-finding services such as Apollo, ContactOut, Instantly, and LinkedIn. TheirStack does not provide personal contact data directly, but connects to third-party providers and shows hiring-manager information for applicable jobs. Company exports are capped at 200 jobs per company; full job history is available through the Job Search API, webhooks, or MCP server. Free is available; API starts at $49 a month.