# Apollo API + MCP vs ZoomInfo API + MCP

> ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Apollo API + MCP's 63.3 (B), 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/apollo-vs-zoominfo
- Markdown: https://www.anchorterminal.com/compare/apollo-vs-zoominfo.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/apollo-vs-zoominfo.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/apollo-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 Apollo API + MCP's 63.3 (B), and leads in 6 of 7 scored categories. Both do lead search.

- Apollo API + MCP: grade B, 63.3/100, rank #361 of 842. Markdown https://www.anchorterminal.com/tools/apollo.md · JSON https://www.anchorterminal.com/api/v1/tools/apollo.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

### Apollo API + MCP (B)

Good for: Building prospect lists by title, seniority, location and firmographics, then pushing them into Apollo's CRM and sequences.

Watch for: Headless MCP use needs a master key that reaches every endpoint

### 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 65
- Agent ergonomics, 71 against 65
- Security & auth, 65 against 60
- Payments & pricing, 40 against 30
- Maintenance & community, 76 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 | Apollo API + MCP | ZoomInfo API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 87 | ZoomInfo API + MCP +22 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 84 | Apollo API + MCP +3 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 71 | ZoomInfo API + MCP +6 |
| Security & auth | 14% (17.5 this run) | 60 | 65 | ZoomInfo API + MCP +5 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | ZoomInfo API + MCP +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 58 | 76 | ZoomInfo API + MCP +18 |
| Transparency & trust | 7% (8.8 this run) | 72 | 75 | ZoomInfo API + MCP +3 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **63.3 · B** | **72.2 · BB** | |

## Facts side by side

| Fact | Apollo API + MCP | ZoomInfo API + MCP |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Apollo.io | ZoomInfo Technologies LLC |
| Hosted endpoint | `https://api.apollo.io/api/v1` | `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 | none | 26 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `io.github.apolloio/apollo-mcp` | not listed |
| Last release | none | 2026-10-02 |
| Terms last updated | 2026-08-10 | no date given |
| Privacy policy last updated | 2026-08-10 | 2025-10-13 |
| Customer content may train models | yes | yes, with an opt-out |
| Terms restrict automated access | yes | 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 | 25 stars | 534 npm/wk |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**Apollo API + MCP.** People search costs 0 credits, up to 100 records a page and 50,000 a query. Headless MCP use needs a master key that reaches every endpoint.

**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

### Apollo API + MCP

1. Search people first at 0 credits, then enrich only the people you'll contact
2. Branch on `error_details.code` and wait `retry_after_seconds` from the suggestions after a 429
3. Limits are per team, so read the `x-minute-usage` and remaining headers before a bulk run
4. Use a scoped key with only the endpoints the job needs. A master key reaches everything
5. Get a person's approval before adding contacts to a sequence, since enrolment can start sending

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

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against Apollo API + MCP's 63.3 (B), and leads in 6 of 7 scored categories.

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

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

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

Yes. Apollo API + MCP has a hosted endpoint at https://api.apollo.io/api/v1 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.


## For agents

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

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