# Apollo.io API

Sales

B2B sales intelligence — contacts, companies, and email sequences.

Apollo.io provides access to a database of 250M+ contacts. Find leads, enrich CRM data, and automate sales outreach with email sequences.

### Details

**Auth Type**  
API Key (api\_key param)

**Rate Limit**  
100 requests/minute

**Pricing**  
Free: 50 credits/mo

### API Key (api\_key param)

Sign up at apollo.io and get your API key from Settings.

[Get API Credentials](https://app.apollo.io/#/settings/integrations/api_keys)

## 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 prospecting
- Contact enrichment
- Email sequences
- CRM integration
- Company research

## 💻 Code Examples

Get started quickly with these code examples in your favorite language

```bash
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](/content/keys/index.html).

## Ready to integrate Apollo.io API?

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