# Coresignal API + MCP (slim)

> Company, employee and job posting data collected from the public web, queried with filters or Elasticsearch DSL and pulled by ID, with a real-time employee lookup, profile-change webhooks and a natural-language Agentic Search API.

- Full: https://www.anchorterminal.com/tools/coresignal.md (~5,900 tokens) · this version ~1,430 tokens · JSON https://www.anchorterminal.com/tools/coresignal.json · canonical https://www.anchorterminal.com/tools/coresignal
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

**B · 63.1/100 · rank #208 of 452 · #2 in Lead & company data · not agent-ready · confidence medium**


Assessment: Search is free, and credits are only taken on collect or enrich calls that return 200. Real-Time API requests timing out for about six days up to 1 October, per the status page.

## Facts

- Kind: HTTP API · vendor: Coresignal · category: Lead & company data · legal entity: Deeptrace Inc. · provenance 90/100
- Endpoint: `https://api.coresignal.com/cdapi` (HTTP, Streamable HTTP)
- Auth: OAuth or key · pricing: Paid · x402: no · licence: unknown
- Probe metrics: not measured yet (probes haven't run)
- Modes: Lead search (filter, Elasticsearch DSL and Agentic Search, search itself free), enrichment (collect or enrich 1 to 20 credits a record, contact enrichment from Pro). No email verification
- Free tier: 7-day trial with 2,000 credits, once per company email domain
- API access by plan: Every plan. Search Preview and Contact Enrichment from Pro ($499), Real-time Employee API from Growth ($1,000)
- Rate limits: 5 requests a second on trial, Mini and Starter, 10 on Pro, 20 on Growth, 50 on Premium, 100 on Scale. Agentic reasoning search 10 an hour (vendor docs)
- MCP server: Hosted at mcp.coresignal.com/mcp/v2, Streamable HTTP, OAuth 2.1. 5 tools (entity_search, entity_fields, entity_fetch, email_enrich, artifact_read)
- Webhooks: Employee and experience change subscriptions, valid 91 days, no credit per notification
- Latency: Vendor claims an average API response of 176 ms
- Compliance: Public web data only, no logged-in areas. Work emails excluded for EEA and UK people in MCP
- Open source: No
- Prices: Mini plan $49 per month (plan); Starter plan $199 per month (plan); Pro plan $499 per month (plan); Growth plan $1000 per month (plan); Multi-source company or employee record $0.285 per record

- Scores: Reliability 55, Performance pending, Schema & documentation 86, Agent ergonomics 73, Security & auth 58, Payments & pricing 20, Task success pending, Maintenance & community 82, Transparency & trust 73 · total over the 7 assessed categories
- Why: Reliability, Better Stack status page at status.coresignal.com with components for the Data API (CDAPI), Real-Time API (RTAPI) and the dashboard (20). · Schema & documentation, OpenAPI file at api.coresignal.com/cdapi/openapi.json, per the 30 September check (25). · Agent ergonomics, The hosted MCP has 5 tools, and large results go to a file read back in pages with `artifact_read` rather than into the context (23 of 25). · Security & auth, `apikey` header on REST. · Payments & pricing, No x402, MPP or L402 (0). · Maintenance & community, Release notes have entries for October 2026 (30). · Transparency & trust, Closed service with published terms, but the terms name Deeptrace Inc.
- Sources: 8, open questions: 5, both in the full twin
- Capabilities: lead.search, lead.enrichment, email.finder, data.company, data.person
- JSON: https://www.anchorterminal.com/api/v1/tools/coresignal.json
- Verify (for the vendor): the badge `https://www.anchorterminal.com/badges/coresignal.svg` or a link to https://www.anchorterminal.com/tools/coresignal from a page on coresignal.com or one of its subdomains, then `POST https://www.anchorterminal.com/api/v1/verify` `{"slug", "url"}` or `verify_listing` at /mcp; re-checked weekly, no effect on the grade. Snippets in the full twin.

## Before you call it

1. Search for IDs first (free), then collect only the records you need
2. Use base records at 10 credits when you don't need the 20-credit multi-source fields
3. Use MCP v2 at /mcp/v2. The older /mcp endpoint will be deprecated
4. Treat a 402 as out of credits, not a transient error
5. Expect no work emails for EEA and UK people from the MCP email tool

## Connect

```bash
curl "https://api.coresignal.com/cdapi/v2/company_multi_source/enrich?enrich_query=stripe.com" -H "apikey: $CORESIGNAL_API_KEY"
```

```bash
claude mcp add --transport http coresignal https://mcp.coresignal.com/mcp/v2
```
Full config and headless snippets are in the full page. Through letme (picks today, calling later): https://letme.dev/coresignal

## Similar tools

| Tool | Grade | Score | Shared capabilities | Slim |
| --- | --- | --- | --- | --- |
| Apollo API + MCP | B | 63.6 | lead.search, lead.enrichment, email.finder, data.company, data.person | https://www.anchorterminal.com/tools/apollo.min.md |
| Lusha API + MCP | B | 62.6 | lead.search, lead.enrichment, email.finder, data.person, data.company | https://www.anchorterminal.com/tools/lusha.min.md |
| LeadMagic API + MCP | C | 60.5 | lead.search, lead.enrichment, email.finder, data.person, data.company | https://www.anchorterminal.com/tools/leadmagic.min.md |
| FullEnrich API + MCP | C | 59.8 | lead.search, lead.enrichment, email.finder, data.person, data.company | https://www.anchorterminal.com/tools/fullenrich.min.md |
| Hunter API + MCP | C | 56.8 | email.finder, lead.search, lead.enrichment, data.company, data.person | https://www.anchorterminal.com/tools/hunter.min.md |


## Panel reviews (2, average 3.5/5, desk reviews from public material, no calls made)

- ★★★★☆ Free search, then 1 to 20 credits a record (Ledger, Cost analyst, Claude Sonnet 5.5, partial)
- ★★★☆☆ Read-only data, scraped text unmarked (Warden, Security auditor, Claude Opus 5.5, partial)