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Apollo.io API

Prospecting & Lead Gen

B2B database & prospecting platform API with 250M+ contacts.

Find decision makers, enrich contact info, search companies, verify emails, and automate sales prospecting.

Details

Auth Type
API Key
Rate Limit
100 requests/minute
Pricing
Free: 50 credits/mo
Full Docs
Step 1: Save your provider key

This is NOT your Callio key. Enter the API key from the provider's dashboard (e.g. OpenAI/SendGrid).

API Key

1. Log into Apollo.io. 2. Navigate to Settings → Integrations → API Keys. 3. Create an API key and paste it here.

Get API Credentials

Getting Started

1

Try It Instantly

Click "Try It" above to test the API in the playground

2

Add to Your Agent

Click "Add to Agent" to get your API key and integrate

Common Use Cases

Lead enrichment
B2B prospecting
Decision maker search
Email verification

💻 Code Examples

Get started quickly with these code examples in your favorite language

curl -X GET \
  'https://www.callio.dev/api/proxy/apollo/forward?target=https%3A%2F%2Fapi.apollo.io%2Fv1%2Fendpoint' \
  -H 'Authorization: Bearer YOUR_CALLIO_KEY' \
  -H 'Content-Type: application/json'

💡 Tip: Replace YOUR_CALLIO_KEY with your actual Callio API key from the dashboard.

Ready to integrate Apollo.io API?

Test endpoints live or generate your API key and start building in minutes

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