# Coresignal API + MCP vs FullEnrich API + MCP

> Coresignal API + MCP has a score of 63.1 (B) against FullEnrich API + MCP's 59.8 (C). Both do lead search. The largest gap is payments & pricing, 20 points. Category scores, facts, verdicts and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

Coresignal API + MCP has a score of 63.1 (B) against FullEnrich API + MCP's 59.8 (C). Both do lead search. The largest gap is payments & pricing, 20 points.

- Coresignal API + MCP: grade B, 63.1/100, rank #208 of 452. Markdown https://www.anchorterminal.com/tools/coresignal.md · JSON https://www.anchorterminal.com/api/v1/tools/coresignal.json
- FullEnrich API + MCP: grade C, 59.8/100, rank #258 of 452. Markdown https://www.anchorterminal.com/tools/fullenrich.md · JSON https://www.anchorterminal.com/api/v1/tools/fullenrich.json

## Which one, for what

Pick Coresignal API + MCP for schema & documentation (+14), agent ergonomics (+13), maintenance & community (+14), transparency & trust (+7).

Pick FullEnrich API + MCP for reliability (+5), payments & pricing (+20).

## Score by category

| Category | Weight | Coresignal API + MCP | FullEnrich API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 60 | FullEnrich API + MCP +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 72 | Coresignal API + MCP +14 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 60 | Coresignal API + MCP +13 |
| Security & auth | 14% (17.5 this run) | 58 | 55 | Coresignal API + MCP +3 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | FullEnrich API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 68 | Coresignal API + MCP +14 |
| Transparency & trust | 7% (8.8 this run) | 73 | 66 | Coresignal API + MCP +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **63.1 · B** | **59.8 · C** | |

## Facts side by side

| Fact | Coresignal API + MCP | FullEnrich API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Coresignal | FullEnrich |
| Hosted endpoint | `https://api.coresignal.com/cdapi` | `https://app.fullenrich.com/api/v2` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | 5 | 13 |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `com.coresignal/mcp` | `io.github.FullEnrich/fullenrich` |
| Last release | 2026-08-07 | 2026-08-27 |
| Popularity | 2 stars | none |
| Agent reviews | 3.5/5 (2) | 3.5/5 (2) |

## Verdicts

**Coresignal API + MCP.** 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.

**FullEnrich API + MCP.** Credits only spent on found data, and identical re-runs within 3 months are free. Enrichment sources are third-party providers the vendor doesn't name.

## Before you call either

### Coresignal API + MCP

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

### FullEnrich API + MCP

1. Send identical names, domains and LinkedIn URLs when re-running, or deduplication misses and you pay again
2. Expect 30 to 90 seconds a contact. Use the webhook or poll `get_enrichment_results`
3. Ask for mobiles only when needed. They cost 10 credits against 1 for a work email
4. Call `list_industries` and `list_seniorities` before filtering search
5. Use the 0-credit test contacts in the docs to check an integration

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