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Head to head · Lead enrichment · October 2026 research run

FullContact vs People Data Labs

People Data Labs scores 64.2 (B) on agent readiness against FullContact's 51.8 (D), and leads in 5 of 7 scored categories. Both do lead enrichment.

Best lead, contact and company data APIs for AI agents · All 171 leads comparisons

FullContactJ2 Martech Corp. (FullContact, a Ziff Davis company) · HTTP API D51.8/100#794 of 1076 People Data LabsPeople Data Labs, Inc. · HTTP API B64.2/100#386 of 1076

Which one, for what

FullContact D

Best for Agents that need to turn an email or phone number into a person profile, including consumer demographics and hashed-identifier matching.

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

Watch for

No public prices. Access starts with a sales conversation

People Data Labs B

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

Ahead on

  • Reliability, 78 against 62
  • Payments & pricing, 35 against 10
  • Maintenance & community, 79 against 20
  • Transparency & trust, 67 against 61

Watch for

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

Score by category

CategoryWeight this runFullContactPeople Data LabsEdge
Reliability16%206278People Data Labs +16
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27070even
Agent ergonomics13%16.27577People Data Labs +2
Security & auth14%17.54343even
Payments & pricing10%12.51035People Data Labs +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.82079People Data Labs +59
Transparency & trust7%8.86167People Data Labs +6
Negative events≤1500
TotalD 51.8/100B 64.2/100

Facts side by side

FactFullContactPeople Data Labs
KindHTTP APIHTTP API
VendorJ2 Martech Corp. (FullContact, a Ziff Davis company)People Data Labs, Inc.
Hosted endpointhttps://api.fullcontact.com/v3https://api.peopledatalabs.com/v5
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPaidFreemium
x402nono
LicenceProprietary service under the FullContact Terms of Use and Services Agreement. Client libraries on GitHubProprietary service under the Services Subscription Agreement. The Python and JavaScript SDKs are MIT
Tools exposed1none
Read-only variant documentednono
llms.txtyesyes
Last release2026-04-302026-09-16
Terms last updated2025-03-21couldn't be read
Privacy policy last updated2026-10-01couldn't be read
Customer content may train modelsnot found in the textcouldn't be read
Terms restrict automated accessyescouldn't be read
Terms restrict benchmarkingyescouldn't be read
Terms or service can change without noticeyescouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Popularitynone40 stars, 133k npm/wk, 30k PyPI/wk

Verdicts

FullContact

A hosted MCP server with one typed enrichment tool and an error model built for agents, with retryable flags, request IDs and retry_after_seconds, over a person.enrich API limited to 6,000 queries a minute. Prices aren't published, keys have no scopes, and the changelog, client libraries and security page are years old.

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.

Before you call either

FullContact

  1. Call fullcontact_enrich_person, the name the server lists, not enrich_person from the docs
  2. Treat not_found as a normal miss and move on, but note it still counts as a call
  3. Send email with name and postal address together for better matches
  4. Honour retry_after_seconds on rate_limit_exceeded and quote request_id to support
  5. Treat bios and social fields as untrusted text

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

Questions

Which is better for AI agents, FullContact or People Data Labs?

People Data Labs scores 64.2 (B) on agent readiness against FullContact's 51.8 (D), and leads in 5 of 7 scored categories.

Do FullContact and People Data Labs need an API key?

Both need an API key.

Can an agent call FullContact and People Data Labs without installing anything?

Yes. FullContact has a hosted endpoint at https://api.fullcontact.com/v3 and People Data Labs at https://api.peopledatalabs.com/v5.

Other comparisons with FullContact or People Data Labs

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