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Head to head · Lead search · October 2026 research run

People Data Labs vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against People Data Labs's 64.2 (B), and leads in 5 of 7 scored categories. People Data Labs leads on agent ergonomics. Both do lead search.

People Data LabsPeople Data Labs, Inc. · HTTP API B64.2/100#326 of 841 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#106 of 841

Which one, for what

People Data Labs B

Good for Products and pipelines that enrich or search person and company records at volume and can write Elasticsearch or SQL queries.

Ahead on

  • Agent ergonomics, 77 against 71

Watch for

No OpenAPI file was found. The machine-readable material is a Postman collection and Elasticsearch mappings

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 78
  • Schema & documentation, 84 against 70
  • Security & auth, 65 against 43
  • Payments & pricing, 40 against 35
  • Transparency & trust, 75 against 67

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

CategoryWeight this runPeople Data LabsZoomInfo API + MCPEdge
Reliability16%207887ZoomInfo API + MCP +9
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27084ZoomInfo API + MCP +14
Agent ergonomics13%16.27771People Data Labs +6
Security & auth14%17.54365ZoomInfo API + MCP +22
Payments & pricing10%12.53540ZoomInfo API + MCP +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87976People Data Labs +3
Transparency & trust7%8.86775ZoomInfo API + MCP +8
Negative events≤1500
Total64.2 · B72.2 · BB

Facts side by side

FactPeople Data LabsZoomInfo API + MCP
KindHTTP APIHTTP API
VendorPeople Data Labs, Inc.ZoomInfo Technologies LLC
Hosted endpointhttps://api.peopledatalabs.com/v5https://api.zoominfo.com/gtm
TransportsHTTPHTTP, Streamable HTTP
AuthAPI keyOAuth
PricingFreemiumFreemium
x402nono
LicenceProprietary service under the Services Subscription Agreement. The Python and JavaScript SDKs are MITProprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT
Tools exposednone26
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-162026-10-02
Terms last updatedcouldn't be readno date given
Privacy policy last updatedcouldn't be read2025-10-13
Customer content may train modelscouldn't be readyes, with an opt-out
Terms restrict automated accesscouldn't be readyes
Terms restrict benchmarkingcouldn't be readyes
Terms or service can change without noticecouldn't be readnot found in the text
Arbitration or class-action waivercouldn't be readyes
Popularity40 stars, 133k npm/wk, 30k PyPI/wk534 npm/wk

Verdicts

People Data Labs

Monthly dated release notes, a free sandbox with synthetic data, response headers that report credits and rate limits, and a free plan of 100 records a month make the API easy to start with. No OpenAPI file was found, keys carry no scopes and may travel in the URL, and the agreement allows changes without notice.

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

People Data Labs

  1. Send the key in the X-Api-Key header. The api_key query parameter puts the secret in URLs and logs
  2. Build and test queries against https://sandbox.api.peopledatalabs.com/v5/... first. It costs no credits and allows five calls a minute
  3. Set size deliberately on search. Every record returned costs one credit, and responses over 1 MB fail
  4. Treat 404 on enrichment as no match, not an error, and 402 as credits exhausted. Neither is worth a retry
  5. On 429, wait until the x-ratelimit-reset time. Limits are fixed-window per key and per endpoint

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, People Data Labs or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against People Data Labs's 64.2 (B), and leads in 5 of 7 scored categories. People Data Labs leads on agent ergonomics.

Do People Data Labs and ZoomInfo API + MCP need an API key?

People Data Labs needs an API key. ZoomInfo API + MCP uses an OAuth sign-in.

Can an agent call People Data Labs and ZoomInfo API + MCP without installing anything?

Yes. People Data Labs has a hosted endpoint at https://api.peopledatalabs.com/v5 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.

Other comparisons with People Data Labs or ZoomInfo API + MCP

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