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Head to head · Lead search · October 2026 research run

RocketReach API vs ZoomInfo API + MCP

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories. Both do lead search.

Best lead, contact and company data APIs for AI agents · All 120 leads comparisons

RocketReach APIRocketReach, LLC · HTTP API D51.2/100#755 of 950 ZoomInfo API + MCPZoomInfo Technologies LLC · HTTP API BB72.2/100#110 of 950

Which one, for what

RocketReach API D

Good for Teams that already hold a RocketReach plan and want an agent to search people and companies, reveal emails and phones, and verify single addresses over MCP.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

The pricing page is drawn by script and was not read, and the docs tell users without a paid plan to email for an API plan

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 64
  • Schema & documentation, 84 against 72
  • Security & auth, 65 against 34
  • Payments & pricing, 40 against 10
  • Maintenance & community, 76 against 31
  • Transparency & trust, 75 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

CategoryWeight this runRocketReach APIZoomInfo API + MCPEdge
Reliability16%206487ZoomInfo API + MCP +23
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27284ZoomInfo API + MCP +12
Agent ergonomics13%16.27271RocketReach API +1
Security & auth14%17.53465ZoomInfo API + MCP +31
Payments & pricing10%12.51040ZoomInfo API + MCP +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.83176ZoomInfo API + MCP +45
Transparency & trust7%8.85875ZoomInfo API + MCP +17
Negative events≤1500
Total51.2 · D72.2 · BB

Facts side by side

FactRocketReach APIZoomInfo API + MCP
KindHTTP APIHTTP API
VendorRocketReach, LLCZoomInfo Technologies LLC
Hosted endpointhttps://api.rocketreach.co/api/v2https://api.zoominfo.com/gtm
TransportsHTTP, Streamable HTTPHTTP, Streamable HTTP
AuthOAuth or keyOAuth
PricingPaidFreemium
x402nono
LicenceProprietary service under RocketReach's Terms of Service. The Python SDK on GitHub is MITProprietary service under ZoomInfo's Licence Terms and Conditions. The GTM CLI on GitHub is MIT
Tools exposed926
Read-only variant documentednono
llms.txtyesyes
Last releasenone2026-10-02
Terms last updated2024-01-31no date given
Privacy policy last updated2026-09-302025-10-13
Customer content may train modelsnot found in the textyes, with an opt-out
Terms restrict automated accessyesyes
Terms restrict benchmarkingnot found in the textyes
Terms or service can change without noticeyesnot found in the text
Arbitration or class-action waiveryesyes
Popularitynone534 npm/wk

Verdicts

RocketReach API

The hosted MCP server has nine documented tools, OAuth 2.1 with dynamic client registration and machine-readable error codes, and searches cost no credits. Plan prices were not readable, the docs send API plan requests to email, the terms require a human account holder, and the account tool returns the account's API key to the model.

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

RocketReach API

  1. Search first with person_search or company_search, which cost no credits, then look up only the profile IDs needed
  2. Treat status: "pending" as normal. Poll check_person_status after at least 3 seconds, and polling is free
  3. Do not echo the account tool's output to users or logs. It includes the account's API key
  4. Send the key in the Api-Key header. The api_key query parameter is deprecated
  5. Bulk lookup takes 1 to 100 queries and needs a webhook. Results arrive at the webhook, signed in X-RocketReach-Signature
  6. Do not loop on unknown from email_verify, or on lookup_failed and not_found. The last two are terminal

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, RocketReach API or ZoomInfo API + MCP?

ZoomInfo API + MCP scores 72.2 (BB) on agent readiness against RocketReach API's 51.2 (D), and leads in 6 of 7 scored categories.

Do RocketReach API and ZoomInfo API + MCP need an API key?

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

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

Yes. RocketReach API has a hosted endpoint at https://api.rocketreach.co/api/v2 and ZoomInfo API + MCP at https://api.zoominfo.com/gtm.

Other comparisons with RocketReach API or ZoomInfo API + MCP

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