# FullEnrich API + MCP vs ZoomInfo API + MCP

> ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against FullEnrich API + MCP's 59.6 (C), and leads in 6 of 7 scored categories. Both do lead search. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/fullenrich-vs-zoominfo
- Markdown: https://www.anchorterminal.com/compare/fullenrich-vs-zoominfo.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/fullenrich-vs-zoominfo.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/fullenrich-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 FullEnrich API + MCP's 59.6 (C), and leads in 6 of 7 scored categories. Both do lead search.

- FullEnrich API + MCP: grade C, 59.6/100, rank #491 of 842. Markdown https://www.anchorterminal.com/tools/fullenrich.md · JSON https://www.anchorterminal.com/api/v1/tools/fullenrich.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

### FullEnrich API + MCP (C)

Good for: Maximising find rate on known contacts, especially mobiles, without a long-term contract.

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

Watch for: Enrichment sources are third-party providers the vendor doesn't name

### 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 60
- Schema & documentation, 84 against 72
- Agent ergonomics, 71 against 60
- Security & auth, 65 against 55
- Maintenance & community, 76 against 68
- Transparency & trust, 75 against 64

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 | FullEnrich API + MCP | ZoomInfo API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 60 | 87 | ZoomInfo API + MCP +27 |
| 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) | 60 | 71 | ZoomInfo API + MCP +11 |
| Security & auth | 14% (17.5 this run) | 55 | 65 | ZoomInfo API + MCP +10 |
| 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) | 68 | 76 | ZoomInfo API + MCP +8 |
| Transparency & trust | 7% (8.8 this run) | 64 | 75 | ZoomInfo API + MCP +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **59.6 · C** | **72.2 · BB** | |

## Facts side by side

| Fact | FullEnrich API + MCP | ZoomInfo API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | FullEnrich | ZoomInfo Technologies LLC |
| Hosted endpoint | `https://app.fullenrich.com/api/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 | 13 | 26 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.FullEnrich/fullenrich` | not listed |
| Last release | 2026-08-27 | 2026-10-02 |
| Terms last updated | 2026-08-20 | no date given |
| Privacy policy last updated | 2026-08-20 | 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 | not found in the text | not found in the text |
| Arbitration or class-action waiver | yes | yes |
| Popularity | none | 534 npm/wk |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**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.

**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

### 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

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

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against FullEnrich API + MCP's 59.6 (C), and leads in 6 of 7 scored categories.

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

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

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

Yes. FullEnrich API + MCP has a hosted endpoint at https://app.fullenrich.com/api/v2 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.


## For agents

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

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