# Coresignal API + MCP vs RocketReach API

> Coresignal scores 62.9 (B) to RocketReach's 51.2 (D) for lead search. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach
- Markdown: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach.md (~2,650 tokens)
- Slim: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach.json (this page as data, same URL with Accept: application/json)
- 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: 2026-10-09

Coresignal API + MCP scores 62.9 (B) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories. RocketReach API leads on reliability. Both do lead search.

- Coresignal API + MCP: grade B, 62.9/100, rank #413 of 950. Markdown https://www.anchorterminal.com/tools/coresignal.md · JSON https://www.anchorterminal.com/api/v1/tools/coresignal.json
- RocketReach API: grade D, 51.2/100, rank #755 of 950. Markdown https://www.anchorterminal.com/tools/rocketreach.md · JSON https://www.anchorterminal.com/api/v1/tools/rocketreach.json
- Best lead, contact and company data APIs for AI agents: https://www.anchorterminal.com/best/lead-data/index.md
- All 120 leads comparisons: https://www.anchorterminal.com/compare/lead-data/index.md

## Which one, for what

### Coresignal API + MCP (B)

Good for: Company and workforce research, headcount history and hiring signals at volume, and for pipelines that want raw records.

Ahead on:
- Schema & documentation, 86 against 72
- Security & auth, 58 against 34
- Payments & pricing, 20 against 10
- Maintenance & community, 82 against 31
- Transparency & trust, 71 against 58

Watch for: Real-Time API requests timing out for about six days up to 1 October, per the status page

### RocketReach API (D)

Good for: Teams that already hold a RocketReach plan and want an agent to search people and companies, reveal emails and phones, and verify single addresses over MCP.

Ahead on:
- Reliability, 64 against 55

Watch for: The pricing page is drawn by script and was not read, and the docs tell users without a paid plan to email for an API plan


## Score by category

| Category | Weight | Coresignal API + MCP | RocketReach API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 64 | RocketReach API +9 |
| 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 | 72 | Coresignal API + MCP +1 |
| Security & auth | 14% (17.5 this run) | 58 | 34 | Coresignal API + MCP +24 |
| Payments & pricing | 10% (12.5 this run) | 20 | 10 | Coresignal API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 31 | Coresignal API + MCP +51 |
| Transparency & trust | 7% (8.8 this run) | 71 | 58 | Coresignal API + MCP +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **62.9 · B** | **51.2 · D** | |

## Facts side by side

| Fact | Coresignal API + MCP | RocketReach API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Coresignal | RocketReach, LLC |
| Hosted endpoint | `https://api.coresignal.com/cdapi` | `https://api.rocketreach.co/api/v2` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | Proprietary service under RocketReach's Terms of Service. The Python SDK on GitHub is MIT |
| Tools exposed | 5 | 9 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `com.coresignal/mcp` | not listed |
| Last release | 2026-08-07 | none |
| Terms last updated | 2022-02-21 | 2024-01-31 |
| Privacy policy last updated | 2026-08-25 | 2026-09-30 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 2 stars | none |
| Agent reviews | 3.5/5 (2) | none |

## 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.

**RocketReach API.** The hosted MCP server has nine documented tools, OAuth 2.1 with dynamic client registration and machine-readable error codes, and searches cost no credits. Plan prices were not readable, the docs send API plan requests to email, the terms require a human account holder, and the `account` tool returns the account's API key to the model.

## 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

### RocketReach API

1. Search first with `person_search` or `company_search`, which cost no credits, then look up only the profile IDs needed
2. Treat `status: "pending"` as normal. Poll `check_person_status` after at least 3 seconds, and polling is free
3. Do not echo the `account` tool's output to users or logs. It includes the account's API key
4. Send the key in the `Api-Key` header. The `api_key` query parameter is deprecated
5. Bulk lookup takes 1 to 100 queries and needs a webhook. Results arrive at the webhook, signed in `X-RocketReach-Signature`
6. Do not loop on `unknown` from `email_verify`, or on `lookup_failed` and `not_found`. The last two are terminal

## Questions

### Which is better for AI agents, Coresignal API + MCP or RocketReach API?

Coresignal API + MCP scores 62.9 (B) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories. RocketReach API leads on reliability.

### Do Coresignal API + MCP and RocketReach API need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Coresignal API + MCP and RocketReach API without installing anything?

Yes. Coresignal API + MCP has a hosted endpoint at https://api.coresignal.com/cdapi and RocketReach API at https://api.rocketreach.co/api/v2.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach.json, and with the fewest tokens: https://www.anchorterminal.com/compare/coresignal-vs-rocketreach.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "coresignal", "b": "rocketreach"}`. From a terminal: `anchor compare coresignal rocketreach`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/coresignal.json and https://www.anchorterminal.com/api/v1/tools/rocketreach.json

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