# RocketReach API vs ZoomInfo API + MCP

> ZoomInfo scores 72.2 (BB) 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/rocketreach-vs-zoominfo
- Markdown: https://www.anchorterminal.com/compare/rocketreach-vs-zoominfo.md (~2,750 tokens)
- Slim: https://www.anchorterminal.com/compare/rocketreach-vs-zoominfo.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/rocketreach-vs-zoominfo.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

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories. Both do lead search.

- 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
- ZoomInfo API + MCP: grade BB, 72.2/100, rank #110 of 950. Markdown https://www.anchorterminal.com/tools/zoominfo.md · JSON https://www.anchorterminal.com/api/v1/tools/zoominfo.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

### 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.

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

### ZoomInfo API + MCP (BB)

Good for: Sales and marketing agents that need company, contact, intent and business-event data from one vendor, with free search before paid enrichment.

Ahead on:
- Reliability, 87 against 64
- Schema & documentation, 84 against 72
- Security & auth, 65 against 34
- Payments & pricing, 40 against 10
- Maintenance & community, 76 against 31
- Transparency & trust, 75 against 58

Also in its favour:
- Agent-ready, a grade of BB or better

Watch for: The Licence Terms and Conditions bar disclosing benchmark results and automated access outside ZoomInfo's own tools without written approval


## Score by category

| Category | Weight | RocketReach API | ZoomInfo API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 64 | 87 | ZoomInfo API + MCP +23 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 72 | 84 | ZoomInfo API + MCP +12 |
| Agent ergonomics | 13% (16.2 this run) | 72 | 71 | RocketReach API +1 |
| Security & auth | 14% (17.5 this run) | 34 | 65 | ZoomInfo API + MCP +31 |
| Payments & pricing | 10% (12.5 this run) | 10 | 40 | ZoomInfo API + MCP +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 31 | 76 | ZoomInfo API + MCP +45 |
| Transparency & trust | 7% (8.8 this run) | 58 | 75 | ZoomInfo API + MCP +17 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **51.2 · D** | **72.2 · BB** | |

## Facts side by side

| Fact | RocketReach API | ZoomInfo API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | RocketReach, LLC | ZoomInfo Technologies LLC |
| Hosted endpoint | `https://api.rocketreach.co/api/v2` | `https://api.zoominfo.com/gtm` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under RocketReach's Terms of Service. The Python SDK on GitHub is MIT | Proprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT |
| Tools exposed | 9 | 26 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | none | 2026-10-02 |
| Terms last updated | 2024-01-31 | no date given |
| Privacy policy last updated | 2026-09-30 | 2025-10-13 |
| Customer content may train models | not found in the text | yes, with an opt-out |
| Terms restrict automated access | yes | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | none | 534 npm/wk |

## Verdicts

**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.

**ZoomInfo API + MCP.** Search, lookup and similar-record calls cost no credits, and a free account with 1,000 data and 1,000 AI credits needs no card. OAuth carries 20 scopes and limits are published per package. The Licence Terms and Conditions bar disclosing benchmark results, and the two documentation sites disagree on batch sizes and rate-limit headers.

## Before you call either

### 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

### ZoomInfo API + MCP

1. Call Lookup first and pass the returned IDs to Search. Unknown industry, metro or topic strings are rejected with a 422
2. Search before Enrich. Search is free, and each newly enriched record costs one data credit
3. Request only the scopes the task needs in the `scope` parameter of the token call. Omitting it grants every scope configured on the app
4. On 429 read `X-RateLimit-Rejected-Bucket` and wait for `Retry-After`. An exhausted hourly window can mean a wait of several hundred seconds
5. Turn off model training in the AI client before connecting the MCP server. ZoomInfo prohibits MCP data being used for training

## Questions

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

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories.

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

RocketReach API takes an API key or an OAuth sign-in. ZoomInfo API + MCP uses an OAuth sign-in.

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

Yes. RocketReach API has a hosted endpoint at https://api.rocketreach.co/api/v2 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.


## For agents

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

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