Waterfall Email Finder API

Find verified work emails from a name and company, or a LinkedIn URL, from your AI assistant, no-code workflow or own code.

  • From $0.017 per Email Found
  • Many Email Finders in One Call
  • 10,000 Emails per Task
Your list
Person and company
Maya Lindqvist, brightwave.io
Tom Okafor, northpeak.com
Léa Moreau, junipervale.studio
What you get back
Email foundStatus
maya.lindqvist@brightwave.ioVerified
tom@northpeak.comVerified
lea@junipervale.studioUnverified

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Works with any tool that can send HTTP requests

  • Claude
  • Cursor
  • Codex
  • Make
  • n8n
  • Zapier
  • Your own code
Get Started

Pick Your Way In

Let an AI assistant or your automation tool do the setup, or call the REST API from your own code.

1

Paste the setup prompt

2

Paste your API key

Get your API key
3

Get your results

See a sample result
Using Make, n8n or Zapier? Here is every field for the HTTP request

Use the HTTP request module or node your tool offers. You need three steps: send the list, wait, then read the results.

1. Send your list (HTTP request)

Method
POST
URL
https://api.datablist.com/v1/enrichments/tasks
Headers
X-API-Key = your API key
Content-Type = application/json
Body (JSON)
json
{
"enrichmentId": "waterfall-email-finder",
"uniqueId": "waterfall-email-finder-import-1",
"settings": {
"sourceKind": "name_company"
},
"inputs": [
{"inputId": "row-1", "data": {"firstName": "Maya", "lastName": "Lindqvist", "companyNameOrDomain": "brightwave.io"}},
{"inputId": "row-2", "data": {"firstName": "Tom", "lastName": "Okafor", "companyNameOrDomain": "northpeak.com"}},
{"inputId": "row-3", "data": {"firstName": "Lea", "lastName": "Moreau", "companyNameOrDomain": "junipervale.studio"}}
]
}
Keep
The @id from the response. That is your task ID.

2. Wait until it is done

Add a short wait or delay, then a GET request to https://api.datablist.com/v1/enrichments/tasks/TASK_ID with the same X-API-Key header. Repeat until status is completed.

3. Read the results

GET https://api.datablist.com/v1/enrichments/tasks/TASK_ID/results?limit=50. Map outputs to your columns. If nextCursor is not empty, call again with &cursor= plus that value.

Overview

At a Glance

One call tries several email finders in a row until one returns an address, and you only pay for the emails found. No Datablist workspace, collection or import needed.

What you give it

What it costs

Use Cases

What Teams Build With It

Put Waterfall Email Finder wherever your data already flows.

Sales and SDRs

Fill your sequences with emails

  1. Lead with name and company
  2. Find the email
  3. Added to your sequence

Find emails for new leads as they arrive and push them straight to Lemlist, Instantly, Apollo or your CRM.

RevOps and Growth

Enrich inbound and event leads

  1. Signup or event list
  2. Find the email
  3. Routed to the right owner

Turn names from webinars, trade shows or partner lists into work emails you can route and follow up on.

Recruiting

Reach candidates directly

  1. Candidate LinkedIn URL
  2. Find the email
  3. Outreach from your ATS

Send a LinkedIn profile URL and get a work email, so your outreach does not depend on InMail credits.

Pricing

What Will It Cost You?

Pay per lookup with credits. API access starts on the Growth plan.

Calculator

How much will it cost you?

Tell us how many contacts you need emails for and we'll show you the cheapest way to get them.

Required: API/MCP access and automation start on the Growth plan.

Recommended plan
…
Credits you'll have
…
Total this month
…
Get your API key

Same credits as the Datablist app View pricing

How credits work

1,000 credits = $1, so each credit costs a tenth of a cent. You pay 25 credits for each email found and nothing for contacts without a result, so the estimate above is the maximum. Using your own finder keys can change the Datablist usage. Every result returns creditsUsed, so you can track the real cost per row. Plan credits renew monthly and reset if unused. Top-up credits never expire.

For Developers

Build It Into Your Code

Everything you need to call the REST API directly: code, responses, endpoints, fields, authentication and limits.

datablist/waterfall-email-finder-api

Official examples: cURL, Python with Requests or async HTTPX, and TypeScript. Put your key in DATABLIST_API_KEY and run.

Open repository

Copy, Paste, Run

A complete script that creates a task, waits for it and prints every result. Replace YOUR_PERSONAL_API_KEY with your key.

# 1. Create the task (returns 202 Accepted and the task "@id")
curl --request POST 'https://api.datablist.com/v1/enrichments/tasks' \
--header 'X-API-Key: YOUR_PERSONAL_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"enrichmentId": "waterfall-email-finder",
"uniqueId": "waterfall-email-finder-import-1",
"settings": {
"sourceKind": "name_company"
},
"inputs": [
{"inputId": "row-1", "data": {"firstName": "Maya", "lastName": "Lindqvist", "companyNameOrDomain": "brightwave.io"}},
{"inputId": "row-2", "data": {"firstName": "Tom", "lastName": "Okafor", "companyNameOrDomain": "northpeak.com"}},
{"inputId": "row-3", "data": {"firstName": "Lea", "lastName": "Moreau", "companyNameOrDomain": "junipervale.studio"}}
]
}'
# 2. Poll every few seconds until status is completed, failed or stopped
curl 'https://api.datablist.com/v1/enrichments/tasks/TASK_ID' \
--header 'X-API-Key: YOUR_PERSONAL_API_KEY'
# 3. Read the results, then follow nextCursor until it is null
curl 'https://api.datablist.com/v1/enrichments/tasks/TASK_ID/results?limit=50' \
--header 'X-API-Key: YOUR_PERSONAL_API_KEY'

What the API Returns

One result per input, with your inputId, a status, the outputs and the credits used. Sample data.

GET /resultsjson
{
"taskId": "00000000000040008000000000000001",
"results": [
{
"inputId": "row-1",
"status": "success",
"outputs": {
"emailFound": "maya.lindqvist@brightwave.io",
"emailStatus": "verified",
"mxProvider": "google"
},
"creditsUsed": "25",
"error": null
}
],
"nextCursor": null
}

Endpoints and Fields

All paths are relative to https://api.datablist.com. Field definitions come from GET /v1/enrichments/waterfall-email-finder (docs updated Oct 21, 2026). Schema version: 2026-09-12.

View API schema (JSON) (opens in a new tab)

GET
/v1/enrichments/waterfall-email-finder
Read the schema, no key needed
POST
/v1/enrichments/tasks
Create a task
GET
/v1/enrichments/tasks/{taskId}
Poll status and progress
GET
/v1/enrichments/tasks/{taskId}/results
Read results, 1 to 100 per page
POST
/v1/enrichments/tasks/{taskId}/stop
Cancel a running task
GET
/v1/enrichments/tasks
Task history, newest first

Schema Reference

Send settings once per task and one data object per input. Results can include extra fields as the enrichment evolves, so keep unknown keys when you parse outputs.

Show all settings, inputs and outputs
Settings
Settings
sourceKindEmail Search MethodText

Choose how to find the email: by using the person's name and company (default), or by LinkedIn URL.Allowed values: "name_company", "linkedin"

useFullNameUse Full NameBoolean

Check this setting to use a single Full Name input instead of First Name and Last Name.

Enabled when: sourceKind==name_company,false

useCustomAPIKeysCustom WaterfallBoolean

Check this setting to customize the Waterfall sequence and use your own API Keys.

Enabled when: sourceKind==name_company,false

customSequenceWaterfall SequenceJSON list

Define each provider and configure your API Keys.

Enabled when: sourceKind==name_company,false&useCustomAPIKeys==true

customSequence[].providerProviderText

Allowed values: "icypeas", "enrow", "prospeo", "wiza", "findymail", "leadmagic", "trykitt", "enrich_so", "full_enrich"

Enabled when: sourceKind==name_company,false&useCustomAPIKeys==true

customSequence[].apiKeyProvider API KeyText

When configuring your sequence, you have to provide your API Key for each provider.

Enabled when: sourceKind==name_company,false&useCustomAPIKeys==true

Inputs (data)
Inputs (data)
firstNameFirst NameJSON

Person's first name. If you only have the full name, enable 'Use Full Name' in the settings.

Enabled when: sourceKind!=linkedin&useFullName==false

lastNameLast NameJSON

Person's last name. If you only have the full name, enable 'Use Full Name' in the settings.

Enabled when: sourceKind!=linkedin&useFullName==false

fullNameFull NameJSON

Person's full name. In you have the First Name and Last Name, disable 'Use FullName' in the settings.

Enabled when: sourceKind!=linkedin&useFullName==true

companyNameOrDomainCompany Name or DomainText

For best results, provide the company domain or website (e.g. datablists.com).

Enabled when: sourceKind!=linkedin

linkedInProfileLinkedIn ProfileText

Person's Profile URL should be in the format of https://linkedin.com/in/xxx . This enrichment doesn't work with Sales Navigator Profile URL format.

Outputs
Outputs
emailFoundEmailText

Email FoundFormat: email

emailStatusEmail StatusText

Deliverability info for found email ('verified', 'unverified'). 'not_found' message when no email has been found. 'missing_source_data', 'invalid_data' for error in input data.

mxProviderMX ProviderText

Email Provider. One of amazon, apple, barracuda, cisco, csc, gandi, google, ionos, microsoft, mimecast, other, ovh, proofpoint, safenames

finderProviderProviderText

Which Email Finder provider returned the result.

Enabled when: sourceKind!=linkedin&useCustomAPIKeys==true

One Header, Clear Limits

Create a Personal API Key in your Datablist account and send it on every authenticated request.

Authentication

Send your key in the X-API-Key header. Datablist exchanges and renews access tokens for you.

  • Header: X-API-Key: YOUR_PERSONAL_API_KEY
  • Optional: manage tokens yourself with Authorization: Bearer from POST /v1/account/token
  • One or the other: sending both headers returns 400 AmbiguousCredentials
  • Server side only: keep keys out of URLs, browser code and logs

Limits

  • Inputs per task: 1 to 10,000
  • Size: 16 KiB per input, 10 MiB per request
  • Run time: up to 24 hours per task
  • Task creation: 10 requests per 60 seconds per account
  • Polling and results: 120 requests per 60 seconds per operation
  • Active tasks: about 20 at once per account
  • Retention: tasks and results are kept for 90 days
FAQ

Frequently Asked Questions

Everything you or your AI coding agent need to integrate the Waterfall Email Finder API: auth, request, polling, results, limits and retries.