# LeadMagic API + MCP vs ZoomInfo API + MCP

> ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against LeadMagic API + MCP's 60.2 (C), and leads in 6 of 7 scored categories. LeadMagic 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/leadmagic-vs-zoominfo
- Markdown: https://www.anchorterminal.com/compare/leadmagic-vs-zoominfo.md (~2,450 tokens)
- Slim: https://www.anchorterminal.com/compare/leadmagic-vs-zoominfo.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/leadmagic-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 LeadMagic API + MCP's 60.2 (C), and leads in 6 of 7 scored categories. LeadMagic API + MCP leads on schema & documentation. Both do lead search.

- LeadMagic API + MCP: grade C, 60.2/100, rank #475 of 842. Markdown https://www.anchorterminal.com/tools/leadmagic.md · JSON https://www.anchorterminal.com/api/v1/tools/leadmagic.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

### LeadMagic API + MCP (C)

Good for: Verification and email or mobile finding in automated pipelines, especially at volume on the plans with credit-free search.

Ahead on:
- Schema & documentation, 93 against 84

Watch for: No free tier or trial credits, plans from $99 a month

### 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 55
- Agent ergonomics, 71 against 61
- Security & auth, 65 against 60
- Payments & pricing, 40 against 20
- Maintenance & community, 76 against 65
- Transparency & trust, 75 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 | LeadMagic API + MCP | ZoomInfo API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 55 | 87 | ZoomInfo API + MCP +32 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 93 | 84 | LeadMagic API + MCP +9 |
| Agent ergonomics | 13% (16.2 this run) | 61 | 71 | ZoomInfo API + MCP +10 |
| Security & auth | 14% (17.5 this run) | 60 | 65 | ZoomInfo API + MCP +5 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | ZoomInfo API + MCP +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 76 | ZoomInfo API + MCP +11 |
| Transparency & trust | 7% (8.8 this run) | 63 | 75 | ZoomInfo API + MCP +12 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.2 · C** | **72.2 · BB** | |

## Facts side by side

| Fact | LeadMagic API + MCP | ZoomInfo API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | LeadMagic | ZoomInfo Technologies LLC |
| Hosted endpoint | `https://api.leadmagic.io` | `https://api.zoominfo.com/gtm` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | none | Proprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT |
| Tools exposed | 48 | 26 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-17 | 2026-10-02 |
| Terms last updated | 2026-08-31 | no date given |
| Privacy policy last updated | 2026-09-20 | 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 | yes | 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 |
| Agent reviews | 3.5/5 (2) | none |

## Verdicts

**LeadMagic API + MCP.** RFC 9457 problem-details errors with `request_id`, and Retry-After on 429. No free tier or trial credits, plans from $99 a month.

**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

### LeadMagic API + MCP

1. Call `preview_cost` before bulk work. It's free
2. Read `X-Credits-Remaining` after each call instead of polling the balance
3. Treat 402 as out of credits and wait out Retry-After on 429
4. Keep credit-free search under 13,333 calls a day per account
5. Retry `unknown` validations later. They cost nothing

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

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against LeadMagic API + MCP's 60.2 (C), and leads in 6 of 7 scored categories. LeadMagic API + MCP leads on schema & documentation.

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

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

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

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


## For agents

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

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