Waterfall

Paid API

What Waterfall is

Waterfall is a paid GTM data API for finding and enriching business contacts. It brings together more than 30 data vendors and supports professional emails, mobile numbers, contact profiles, company details, and job changes. Its endpoints cover prospecting, contact and company search, contact and phone enrichment, job-change detection, and email verification. Email addresses can be matched to business profiles. Waterfall says contact profiles are verified in real time and returned emails are checked before delivery. Searches can draw on more than 750 million profiles. For enrichment, credits are deducted only when a verified email or matched profile is returned, while empty results are free. The API is available at https://api.waterfall.io and requires an API key in the x-api-key header; it can also work with an existing vendor API key. Waterfall states 99.99% uptime, vendor redundancy, SOC 2 Type II certification, and GDPR and CCPA compliance. Pricing is on request, with prepaid usage rates based on committed volume and customer data.

Who it suits

It suits GTM and revenue leaders, GTM engineers, RevOps teams, and PLG teams needing API-based contact data and enrichment. Teams wanting real-time verification and outcome-based enrichment charges may also find it suitable.

What it does well

More than 30 data vendors in one API
Real-time profile and email verification
Empty enrichment results are free
Searches can draw on 750 million profiles
Dedicated Slack and engineering support

What to know first

Pricing is available only on request
Platform customer partnerships are selective
Requires an API key for requests

Limits

There is no fixed list price; usage is prepaid, with rates based on committed volume and customer data. Waterfall may limit access because it selectively partners with platform customers based on strategic alignment and responsible data use.

Plans

Plan	Billed and limits	Price
Usage-based / prepaid	Prepaid balance reduced for each successful match; large-volume customers can be invoiced monthly based on the previous month’s consumption. · No fixed list price shown; rates depend on committed volume and are quoted against customer data	On request

As waterfall.io lists them, read 9 Oct 2026. The maker's own page has the final word.

Getting started

Open https://www.waterfall.io/
Request pricing and share committed volume or customer-data details
Obtain an API key for requests
Send requests to https://api.waterfall.io using the x-api-key header
Run data-quality and coverage tests through CSV, S3, or API
Use onboarding support to prepare a launch

Verdict

Waterfall combines contact search, enrichment, verification, and job-change data behind one API. Its real-time checks and charge-on-success model may fit teams that need measurable data results, but buyers must request pricing and meet its platform-partner criteria.

Questions

What does Waterfall provide?

It provides a GTM data API for prospecting, searches, contact and phone enrichment, job-change detection, email verification, and business-profile matching.

How is enrichment charged?

Credits are deducted when Waterfall returns a verified email or matched profile. Empty results are free; prepaid rates depend on committed volume and customer data.

Which platforms does it support?

The listed platform is an API. Requests use https://api.waterfall.io and require an API key in the x-api-key header.

Who is Waterfall intended for?

The maker describes it for GTM and revenue leaders, GTM engineers, RevOps teams, and PLG teams.

Does Waterfall offer security and privacy commitments?

Waterfall states that it is SOC 2 Type II certified, GDPR and CCPA compliant, and does not store, reuse, or resell customer data.

Facts from Waterfall's own pages

API endpoints: The API documentation lists endpoints for prospecting, contact and company search, contact and phone enrichment, job-change detection, and email verification. · docs.waterfall.io, 9 Oct 2026
API integration: The maker describes Waterfall as a data layer accessed through one API and says it can be used with an existing vendor API key. · waterfall.io, 9 Oct 2026
Data coverage: The Contact Search page says searches can draw on a database of more than 750 million profiles. · waterfall.io, 9 Oct 2026
Headquarters: United States · waterfall.io, 28 Sept 2026
Intended users: The maker describes its users as GTM and revenue leaders, GTM engineers, RevOps teams, and PLG teams. · waterfall.io, 9 Oct 2026
Notable limit: Waterfall says it is selective about partnering with platform customers, based on strategic alignment and responsible data use. · waterfall.io, 9 Oct 2026
Onboarding: The maker says teams can run data-quality and coverage tests via CSV, S3, or API and may go live as early as the next day. · waterfall.io, 9 Oct 2026
Outcome-based charges: For contact enrichment, credits are deducted only when Waterfall returns a verified email or matched profile; empty results are free. · waterfall.io, 9 Oct 2026
Platform access: The API documentation says requests use https://api.waterfall.io and require an API key in the x-api-key header. · docs.waterfall.io, 9 Oct 2026
Product: Waterfall provides a GTM data API that aggregates more than 30 data vendors for contact, email, and mobile-number coverage. · waterfall.io, 9 Oct 2026
Real-time verification: The maker says contact profiles are verified in real time and returned emails are checked before delivery. · waterfall.io, 9 Oct 2026
Reliability: The homepage claims 99.99% uptime and built-in redundancy across its data vendors. · waterfall.io, 9 Oct 2026
Security and privacy: The homepage states that Waterfall is SOC 2 Type II certified, GDPR and CCPA compliant, and does not store, reuse, or resell customer data. · waterfall.io, 9 Oct 2026
Support: The maker offers dedicated Slack support for platform customers and says its API onboarding includes direct engineering access and response times under one hour. · waterfall.io, 9 Oct 2026
Use cases: The service supports contact search, verified email and phone enrichment, job-change tracking, and matching emails to business profiles. · waterfall.io, 9 Oct 2026

Where Waterfall stands on Freedom251

Data Enrichment Software#32 of 34
Lead Enrichment Software#31 of 31