# Hunter API + MCP vs ZoomInfo API + MCP

> ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Hunter API + MCP's 56.5 (C), and leads in 4 of 7 scored categories. Hunter API + MCP leads on schema & documentation. Both do lead search. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/hunter-vs-zoominfo
- Markdown: https://www.anchorterminal.com/compare/hunter-vs-zoominfo.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/hunter-vs-zoominfo.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/hunter-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 Hunter API + MCP's 56.5 (C), and leads in 4 of 7 scored categories. Hunter API + MCP leads on schema & documentation. Both do lead search.

- Hunter API + MCP: grade C, 56.5/100, rank #569 of 842. Markdown https://www.anchorterminal.com/tools/hunter.md · JSON https://www.anchorterminal.com/api/v1/tools/hunter.json
- ZoomInfo API + MCP: grade BB, 72.2/100, rank #106 of 842. Markdown https://www.anchorterminal.com/tools/zoominfo.md · JSON https://www.anchorterminal.com/api/v1/tools/zoominfo.json

## Which one, for what

### Hunter API + MCP (C)

Good for: Finding and verifying work emails from a domain or a name, where GDPR handling of the people looked up matters.

Ahead on:
- Schema & documentation, 90 against 84

Also in its favour:
- Free to start without a card

Watch for: Hosted MCP has about 100 tools, including bulk deletes and API key creation, with no read-only mode

### 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 50
- Agent ergonomics, 71 against 54
- Security & auth, 65 against 33
- Maintenance & community, 76 against 63

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 | Hunter API + MCP | ZoomInfo API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 50 | 87 | ZoomInfo API + MCP +37 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 90 | 84 | Hunter API + MCP +6 |
| Agent ergonomics | 13% (16.2 this run) | 54 | 71 | ZoomInfo API + MCP +17 |
| Security & auth | 14% (17.5 this run) | 33 | 65 | ZoomInfo API + MCP +32 |
| Payments & pricing | 10% (12.5 this run) | 40 | 40 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 63 | 76 | ZoomInfo API + MCP +13 |
| Transparency & trust | 7% (8.8 this run) | 78 | 75 | Hunter API + MCP +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **56.5 · C** | **72.2 · BB** | |

## Facts side by side

| Fact | Hunter API + MCP | ZoomInfo API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Hunter | ZoomInfo Technologies LLC |
| Hosted endpoint | `https://api.hunter.io/v2` | `https://api.zoominfo.com/gtm` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | none | Proprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT |
| Tools exposed | 107 | 26 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | none | 2026-10-02 |
| Terms last updated | no date given | no date given |
| Privacy policy last updated | no date given | 2025-10-13 |
| Customer content may train models | not found in the text | yes, with an opt-out |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 9 stars | 534 npm/wk |
| Agent reviews | 3/5 (2) | none |

## Verdicts

**Hunter API + MCP.** Returns 451 for people who asked not to be processed. Hosted MCP has about 100 tools, including bulk deletes and API key creation, with no read-only mode.

**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

### Hunter API + MCP

1. Treat 451 as final. The person opted out and retrying won't help
2. Back off on 403 with a rate-limit message. 429 means the plan's credits are gone
3. Send the key in `X-API-Key`, never as `?api_key=`
4. Use `test-api-key` to check request shapes without spending credits
5. Use the hosted MCP at mcp.hunter.io/mcp, not the deprecated local npm package

### 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, Hunter API + MCP or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Hunter API + MCP's 56.5 (C), and leads in 4 of 7 scored categories. Hunter API + MCP leads on schema & documentation.

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

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

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

Yes. Hunter API + MCP has a hosted endpoint at https://api.hunter.io/v2 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.


## For agents

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

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