# API Reference — BillionVerify Docs

> Complete BillionVerify API reference for authentication, email verification, file jobs, downloads, credits, and webhooks.

---
## Navigation

- [Home](https://billionverify.com/index.md)

**Product:**
- [Features](https://billionverify.com/features.md)
- [Email Verification](https://billionverify.com/email-verification.md)
- [Bulk Email Verification](https://billionverify.com/bulk-email-verification.md)
- [Email List Cleaning](https://billionverify.com/email-list-cleaning.md)
- [Email Validation API](https://billionverify.com/email-validation-api.md)
- [White Label](https://billionverify.com/whitelabel.md)

- [Blog](https://billionverify.com/blog.md)
- [Pricing](https://billionverify.com/pricing.md)

---
**Page Language:** English

---
API Reference — BillionVerify Docs

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[SDKs](https://billionverify.com/docs/sdks.md)

[AI Guides](https://billionverify.com/docs/ai-guides.md)

[Integration Guides](https://billionverify.com/docs/integration-guides.md)

# API Reference

Complete BillionVerify API reference for authentication, email verification, file jobs, downloads, credits, and webhooks.

The BillionVerify API is a RESTful service for real-time email verification, synchronous batch checks, asynchronous file processing, credits, and webhooks. All requests must be sent over HTTPS.

## [Base URL](#base-url)

```
https://api.billionverify.com/v1
```

## [OpenAPI Specification](#openapi-specification)

The canonical machine-readable contract is available here:

-   **OpenAPI YAML**: [https://api.billionverify.com/openapi.yaml](https://api.billionverify.com/openapi.yaml)

-   **Interactive API Docs**: [https://api.billionverify.com/docs](https://api.billionverify.com/docs)

## [Authentication](#authentication)

Send your API key in the `BV-API-KEY` header:

```
BV-API-KEY: sk_...
```

The following header names are all accepted, in priority order:

1.  `BV-API-KEY` _(recommended)_
2.  `BILLIONVERIFY-API-KEY`
3.  `Authorization: Bearer <api_key>`

Get your API key from the [BillionVerify dashboard](/auth/sign-in?next=/home.md).

### [Example](#example)

```
curl -X POST https://api.billionverify.com/v1/verify/single \
  -H "BV-API-KEY: sk_xxx" \
  -H "Content-Type: application/json" \
  -d '{"email":"test@example.com","check_smtp":false}'
```

## [Rate Limits](#rate-limits)

Rate limits are applied per API key and endpoint type.

| Endpoint | Rate Limit |
| --- | --- |
| Single Verification (`/verify/single`) | 6,000 requests/minute |
| Batch Verification (`/verify/bulk`) | 1,500 requests/minute |
| File Upload (`/verify/file`) | 300 requests/minute |
| Disposable Check (`/verify/disposable`) | 6,000 requests/minute |
| Other endpoints (`/credits`, `/webhooks`, etc.) | 600 requests/minute |

When rate limited, the API returns `429 Too Many Requests`:

```
{
  "success": false,
  "code": "4290",
  "message": "Rate limit exceeded",
  "error": {
    "code": "RATE_LIMIT_EXCEEDED",
    "message": "Too many requests. Please try again later."
  }
}
```

## [Response Format](#response-format)

Successful responses:

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {}
}
```

Error responses:

```
{
  "success": false,
  "code": "4010",
  "message": "Unauthorized",
  "error": {
    "code": "INVALID_API_KEY",
    "message": "API key is invalid or missing"
  }
}
```

## [Endpoints](#endpoints)

### [Single Email Verification](#single-email-verification)

Verify a single email synchronously.

```
POST /verify/single
```

#### [Request](#request)

```
{
  "email": "user@example.com",
  "check_smtp": false
}
```

#### [Parameters](#parameters)

| Parameter | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `email` | string | Yes | \- | Email address to verify |
| `check_smtp` | boolean | No | `false` | Perform live SMTP mailbox verification |
| `force_refresh` | boolean | No | `false` | Bypass cached results and force a fresh live verification |

#### [Notes](#notes)

-   `check_smtp` defaults to `false` when omitted.

-   When `check_smtp=false`, the request skips live SMTP network checks.

-   `force_refresh` defaults to `false`. Set to `true` only when you need the most current result and are willing to consume a credit even if a cached result exists.

#### [Response](#response)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "email": "user@example.com",
    "status": "valid",
    "score": 0.95,
    "is_deliverable": true,
    "is_disposable": false,
    "is_catchall": false,
    "is_role": false,
    "is_free": false,
    "has_gravatar": false,
    "gravatar_url": "",
    "domain": "example.com",
    "domain_age": 10,
    "mx_records": ["mail.example.com"],
    "domain_reputation": {
      "mx_ip": "192.0.2.1",
      "is_listed": false,
      "blacklists": [],
      "checked": true
    },
    "smtp_check": false,
    "reason": "accepted",
    "smtp_response": "",
    "error_message": "",
    "domain_suggestion": "",
    "response_time": 250,
    "credits_used": 1
  }
}
```

### [Batch Email Verification](#batch-email-verification)

Verify multiple email addresses synchronously. Use this for small batches of up to `50` emails.

```
POST /verify/bulk
```

#### [Request](#request-1)

```
{
  "emails": ["user1@example.com", "user2@example.com"],
  "check_smtp": false
}
```

#### [Parameters](#parameters-1)

| Parameter | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `emails` | array | Yes | \- | Array of email addresses (max: `50`) |
| `check_smtp` | boolean | No | `false` | Perform live SMTP mailbox verification |

#### [Response](#response-1)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "results": [{
        "email": "user1@example.com",
        "status": "valid",
        "score": 0.95,
        "is_deliverable": true,
        "credits_used": 1
      },
      {
        "email": "user2@example.com",
        "status": "invalid",
        "score": 0,
        "is_deliverable": false,
        "credits_used": 0
      }],
    "total_emails": 2,
    "valid_emails": 1,
    "invalid_emails": 1,
    "credits_used": 1,
    "process_time": 1500
  }
}
```

### [Disposable Email Check](#disposable-email-check)

Check whether an email address belongs to a known disposable (temporary) email provider. This endpoint is **free** — it performs an in-memory domain lookup and does not consume any credits.

```
POST /verify/disposable
GET  /verify/disposable?email=user@example.com
```

#### [Request (POST)](#request-post)

```
{
  "email": "user@example.com"
}
```

#### [Parameters](#parameters-2)

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `email` | string | Yes | Email address to check |

#### [Notes](#notes-1)

-   This endpoint does **not** charge credits.

-   `check_smtp` is not supported. For full SMTP verification use `/verify/single`, `/verify/bulk`, or `/verify/file` with `check_smtp: true`.

-   Accepts both `POST` with a JSON body and `GET` with an `?email=` query parameter.

#### [Response](#response-2)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "email": "user@mailnull.com",
    "domain": "mailnull.com",
    "is_disposable": true,
    "checked_at": "2026-05-19T10:00:00Z"
  }
}
```

#### [Response Fields](#response-fields)

| Field | Type | Description |
| --- | --- | --- |
| `email` | string | Normalised email address (lowercase) |
| `domain` | string | Domain portion of the email (ASCII / Punycode) |
| `is_disposable` | boolean | `true` if the domain is a known disposable provider |
| `checked_at` | string | UTC timestamp of the check (RFC 3339) |

### [File Upload Verification](#file-upload-verification)

Upload a CSV, TXT, or XLSX file for asynchronous verification.

```
POST /verify/file
```

#### [Multipart Fields](#multipart-fields)

| Field | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `file` | file | Yes | \- | CSV, TXT, or XLSX file |
| `check_smtp` | boolean | No | `false` | Perform live SMTP mailbox verification |
| `email_column` | string | No | auto-detect | Column containing email addresses |
| `preserve_original` | boolean | No | `true` | Keep original columns in the result file |

#### [Limits](#limits)

No application-enforced file-size or row-count limit.

#### [Response](#response-3)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "task_id": "7143874e-21c5-43c1-96f3-2b52ea41ae6a",
    "file_name": "emails.csv",
    "file_size": 45678,
    "status": "pending",
    "message": "File uploaded successfully, parsing and processing email verification",
    "status_url": "https://api.billionverify.com/v1/verify/file/7143874e-21c5-43c1-96f3-2b52ea41ae6a",
    "created_at": "2026-02-04T10:30:00Z",
    "estimated_count": 1000,
    "unique_emails": 950,
    "total_rows": 1000,
    "email_column": "email"
  }
}
```

### [Get File Job Status](#get-file-job-status)

Get the latest status for a file job.

```
GET /verify/file/{job_id}
```

#### [Query Parameters](#query-parameters)

| Parameter | Type | Required | Default | Description |
| --- | --- | --- | --- | --- |
| `timeout` | integer | No | `0` | Long-polling timeout in seconds (`0-300`) |

#### [Download Link Semantics](#download-link-semantics)

-   `download_url` is the stable API entrypoint for result downloads.

-   `direct_download_url` is a signed storage URL for immediate download.

-   `direct_download_expires_at` tells you when that signed storage URL expires.

-   `result_file_url` and `result_file_path` are **not** part of the public API contract.

#### [Response](#response-4)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "task_id": "7143874e-21c5-43c1-96f3-2b52ea41ae6a",
    "status": "completed",
    "progress": 100,
    "email_progress": 100,
    "chunk_progress": 100,
    "progress_source": "email",
    "total_emails": 1000,
    "processed_emails": 1000,
    "valid_emails": 850,
    "invalid_emails": 100,
    "unknown_emails": 30,
    "role_emails": 15,
    "catchall_emails": 5,
    "risky_emails": 0,
    "disposable_emails": 0,
    "credits_used": 970,
    "download_url": "https://api.billionverify.com/v1/verify/file/7143874e-21c5-43c1-96f3-2b52ea41ae6a/results",
    "direct_download_url": "https://download.example.com/results_7143874e.csv?signature=...",
    "direct_download_expires_at": "2026-02-04T11:32:05Z",
    "started_at": "2026-02-04T10:30:00Z",
    "completed_at": "2026-02-04T10:32:05Z",
    "total_chunks": 10,
    "completed_chunks": 10,
    "failed_chunks": 0,
    "unique_emails": 950,
    "total_rows": 1000
  }
}
```

#### [Job Status Values](#job-status-values)

| Status | Description |
| --- | --- |
| `preparing` | File is being parsed and staged |
| `pending` | Job is queued for execution |
| `running` | Workflow has started |
| `processing` | Emails are actively being verified |
| `merging` | Results are being finalized |
| `paused` | Job is paused and can be resumed |
| `completed` | Job finished successfully |
| `completed_with_warning` | Job finished, but with warnings |
| `failed` | Job failed |
| `cancelled` | Job was cancelled |

### [Download File Results](#download-file-results)

Download verification results for a completed file job.

```
GET /verify/file/{job_id}/results
```

#### [Behavior](#behavior)

-   Without filters, the endpoint responds with `307 Temporary Redirect` to the full result file.

-   With filters, the endpoint returns a generated CSV directly.

-   Filters are combined with OR semantics.

#### [Query Parameters](#query-parameters-1)

| Parameter | Type | Description |
| --- | --- | --- |
| `valid` | boolean | Include valid emails |
| `invalid` | boolean | Include invalid emails |
| `risky` | boolean | Include risky emails |
| `unknown` | boolean | Include unknown emails |
| `catchall` | boolean | Include catch-all emails |
| `role` | boolean | Include role emails |
| `disposable` | boolean | Include disposable emails |

#### [Example](#example-1)

```
curl -L -o filtered-results.csv \
  "https://api.billionverify.com/v1/verify/file/{job_id}/results?valid=true&catchall=true&role=true" \
  -H "BILLIONVERIFY-API-KEY: sk_xxx"
```

### [Credits](#credits)

Get the current credit balance for the authenticated account.

```
GET /credits
```

#### [Response](#response-5)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "account_id": "abc123",
    "api_key_id": "key_xyz",
    "api_key_name": "Default API Key",
    "credits_balance": 9500,
    "credits_consumed": 500,
    "credits_added": 10000,
    "last_updated": "2026-02-04T10:30:00Z"
  }
}
```

## [Webhooks](#webhooks)

Use webhooks to receive asynchronous file-job notifications.

### [Endpoints](#endpoints-1)

-   `POST /webhooks`

-   `GET /webhooks`

-   `DELETE /webhooks/{webhook_id}`

### [Supported Events](#supported-events)

-   `file.completed`

-   `file.failed`

`verification.completed` is not part of the public webhook contract.

### [Create Webhook](#create-webhook)

```
POST /webhooks
```

#### [Request](#request-2)

```
{
  "url": "https://your-app.com/webhooks/billionverify",
  "events": ["file.completed", "file.failed"]
}
```

#### [Rules](#rules)

-   `url` must be HTTPS

-   `events` may contain only supported event names

#### [Response](#response-6)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "id": "673f3bff-81ea-4730-9cef-af1eb7f134bf",
    "url": "https://your-app.com/webhooks/billionverify",
    "events": ["file.completed", "file.failed"],
    "secret": "5c609e6893ab3b65ce8940549a030bc165762fe171e0b38f880bd570099619bf",
    "is_active": true,
    "created_at": "2026-02-04T10:30:00Z",
    "updated_at": "2026-02-04T10:30:00Z"
  }
}
```

The webhook `secret` is returned only on creation. Store it securely. You need it to verify webhook signatures.

### [List Webhooks](#list-webhooks)

```
GET /webhooks
```

#### [Response](#response-7)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "webhooks": [{
        "id": "673f3bff-81ea-4730-9cef-af1eb7f134bf",
        "url": "https://your-app.com/webhooks/billionverify",
        "events": ["file.completed", "file.failed"],
        "is_active": true,
        "last_delivery_status": "success",
        "last_delivery_at": "2026-04-01T12:00:00Z",
        "last_error": null,
        "created_at": "2026-02-04T10:30:00Z",
        "updated_at": "2026-02-04T10:30:00Z"
      }],
    "total": 1
  }
}
```

-   `last_delivery_status` is `success` or `failed` when a delivery has been attempted.

-   `last_delivery_at` is the timestamp of the most recent final delivery outcome.

-   `last_error` contains the latest final error message, or `null` when the latest delivery succeeded.

-   For webhooks that have never been delivered, all three fields are `null`.

### [Delete Webhook](#delete-webhook)

```
DELETE /webhooks/{webhook_id}
```

#### [Response](#response-8)

```
{
  "success": true,
  "code": "0",
  "message": "Success",
  "data": {
    "message": "Webhook deleted successfully",
    "webhook_id": "673f3bff-81ea-4730-9cef-af1eb7f134bf"
  }
}
```

### [Webhook Delivery Headers](#webhook-delivery-headers)

| Header | Description |
| --- | --- |
| `Content-Type` | `application/json` |
| `X-Webhook-Event` | Event type |
| `X-Webhook-Timestamp` | Timestamp used in signature verification |
| `X-Webhook-Signature` | `sha256=<hex_digest>` |

### [Webhook Payload](#webhook-payload)

```
{
  "event": "file.completed",
  "timestamp": "2026-02-04T10:35:00Z",
  "data": {
    "job_id": "7143874e-21c5-43c1-96f3-2b52ea41ae6a",
    "file_name": "emails.csv",
    "total_emails": 1000,
    "valid_emails": 850,
    "invalid_emails": 100,
    "role_emails": 30,
    "catchall_emails": 10,
    "unknown_emails": 10,
    "disposable_emails": 0,
    "credits_used": 990,
    "process_time_seconds": 125.5,
    "download_url": "https://api.billionverify.com/v1/verify/file/7143874e-21c5-43c1-96f3-2b52ea41ae6a/results",
    "direct_download_url": "https://download.example.com/results_7143874e.csv?signature=...",
    "direct_download_expires_at": "2026-02-04T11:35:00Z"
  }
}
```

### [Verifying Webhook Signatures](#verifying-webhook-signatures)

Webhook signatures use HMAC-SHA256 over this exact string:

```
{timestamp}.{raw_body}
```

The signature header format is:

```
X-Webhook-Signature: sha256=<hex_digest>
```

Recommended verification flow:

1.  Read the raw request body exactly as received.
2.  Read `X-Webhook-Timestamp`.
3.  Build `{timestamp}.{raw_body}`.
4.  Compute HMAC-SHA256 with your webhook secret.
5.  Compare against `X-Webhook-Signature`.
6.  Reject stale timestamps to reduce replay risk.

```
const crypto = require('crypto');

function verifyWebhookSignature(rawBody, timestamp, signature, secret) {
  const signedPayload = `${timestamp}.${rawBody}`;
  const expectedSignature =
    'sha256=' +
    crypto.createHmac('sha256', secret).update(signedPayload).digest('hex');

  return crypto.timingSafeEqual(Buffer.from(signature),
    Buffer.from(expectedSignature),);
}
```

```
import hashlib
import hmac

def verify_webhook_signature(raw_body: bytes, timestamp: str, signature: str, secret: str) -> bool:
    signed_payload = timestamp.encode() + b"." + raw_body
    expected = "sha256=" + hmac.new(secret.encode(),
        signed_payload,
        hashlib.sha256,).hexdigest()
    return hmac.compare_digest(signature, expected)
```

## [Verification Status](#verification-status)

| Status | Meaning | Recommended Action |
| --- | --- | --- |
| `valid` | Email exists and can receive messages | Safe to send |
| `invalid` | Email does not exist or cannot receive | Remove from list |
| `unknown` | Deliverability could not be confirmed | Retry later or use caution |
| `risky` | Deliverable, but the domain has a confirmed abuse history | Remove from list |
| `disposable` | Temporary or disposable mailbox | Usually remove |
| `catchall` | Domain accepts all addresses | Monitor bounce behavior |
| `role` | Role-based mailbox such as `info@` or `support@` | Usually deliverable, may engage less |

> **Changed 2026-08-04.** `risky` previously meant "we could not finish verifying" (an internal SMTP capacity fallback) and was retryable and free. That case is now returned as `unknown` with the same `mx_only_verification_semaphore_timeout` reason, unchanged in behaviour and still free. If your integration treats `risky` as "retry later", update it.

## [Error Codes](#error-codes)

| Code | HTTP Status | Description |
| --- | --- | --- |
| `0` | 200 | Success |
| `4000` | 400 | Bad request |
| `4010` | 401 | Invalid or missing API key |
| `4020` | 402 | Insufficient credits |
| `4040` | 404 | Resource not found |
| `4130` | 413 | File too large |
| `4290` | 429 | Rate limit exceeded |
| `1000` | 500 | Internal server error |

## [Best Practices](#best-practices)

### [1. Keep API Keys Out of Source Code](#1-keep-api-keys-out-of-source-code)

```
const apiKey = process.env.BV_API_KEY;
```

### [2. Use Batch vs File Endpoints Correctly](#2-use-batch-vs-file-endpoints-correctly)

| Use Case | Endpoint | Limit |
| --- | --- | --- |
| Single real-time verification | `/verify/single` | 1 email |
| Small synchronous batch | `/verify/bulk` | 50 emails |
| Large asynchronous processing | `/verify/file` | 100,000 emails/file |

### [3. Prefer Webhooks for File Jobs](#3-prefer-webhooks-for-file-jobs)

Polling is supported, but webhooks are a better fit for long-running file verification workflows.

## [SDKs](#sdks)

[### Node.js](https://billionverify.com/docs/sdks/node.md)[### Python](https://billionverify.com/docs/sdks/python.md)[### Go](https://billionverify.com/docs/sdks/golang.md)[### PHP](https://billionverify.com/docs/sdks/php.md)

## [Next Steps](#next-steps)

[### Quickstart Guide

Get started in 5 minutes](https://billionverify.com/docs/quickstart.md)[### Verification Types

Understand status meanings](https://billionverify.com/docs/product/verification-types.md)[### Integration Guides

Platform-specific tutorials](https://billionverify.com/docs/integration-guides.md)

[Quickstart

Get started with email verification API in 5 minutes. Free API key, code examples, and email verification integration guide.](https://billionverify.com/docs/quickstart.md)[Verification Reasons

Complete reference for all verification reason codes returned by BillionVerify API — what each reason means and how to act on it.](https://billionverify.com/docs/verification-reasons.md)

### On this page

[Base URL](#base-url)[OpenAPI Specification](#openapi-specification)[Authentication](#authentication)[Example](#example)[Rate Limits](#rate-limits)[Response Format](#response-format)[Endpoints](#endpoints)[Single Email Verification](#single-email-verification)[Request](#request)[Parameters](#parameters)[Notes](#notes)[Response](#response)[Batch Email Verification](#batch-email-verification)[Request](#request-1)[Parameters](#parameters-1)[Response](#response-1)[Disposable Email Check](#disposable-email-check)[Request (POST)](#request-post)[Parameters](#parameters-2)[Notes](#notes-1)[Response](#response-2)[Response Fields](#response-fields)[File Upload Verification](#file-upload-verification)[Multipart Fields](#multipart-fields)[Limits](#limits)[Response](#response-3)[Get File Job Status](#get-file-job-status)[Query Parameters](#query-parameters)[Download Link Semantics](#download-link-semantics)[Response](#response-4)[Job Status Values](#job-status-values)[Download File Results](#download-file-results)[Behavior](#behavior)[Query Parameters](#query-parameters-1)[Example](#example-1)[Credits](#credits)[Response](#response-5)[Webhooks](#webhooks)[Endpoints](#endpoints-1)[Supported Events](#supported-events)[Create Webhook](#create-webhook)[Request](#request-2)[Rules](#rules)[Response](#response-6)[List Webhooks](#list-webhooks)[Response](#response-7)[Delete Webhook](#delete-webhook)[Response](#response-8)[Webhook Delivery Headers](#webhook-delivery-headers)[Webhook Payload](#webhook-payload)[Verifying Webhook Signatures](#verifying-webhook-signatures)[Verification Status](#verification-status)[Error Codes](#error-codes)[Best Practices](#best-practices)[1\. Keep API Keys Out of Source Code](#1-keep-api-keys-out-of-source-code)[2\. Use Batch vs File Endpoints Correctly](#2-use-batch-vs-file-endpoints-correctly)[3\. Prefer Webhooks for File Jobs](#3-prefer-webhooks-for-file-jobs)[SDKs](#sdks)[Next Steps](#next-steps)

---

## Sitemap

**Product:**
- [Pricing](https://billionverify.com/pricing.md)
- [Features](https://billionverify.com/features.md)
- [Email Verification](https://billionverify.com/email-verification.md)
- [Bulk Email Verification](https://billionverify.com/bulk-email-verification.md)
- [Email List Cleaning](https://billionverify.com/email-list-cleaning.md)
- [Email Validation API](https://billionverify.com/email-validation-api.md)
- [White Label](https://billionverify.com/whitelabel.md)

**Methods:**
- [Email Checker](https://billionverify.com/email-checker.md)
- [Disposable Email Detection](https://billionverify.com/disposable-email-detection.md)
- [Bounce Email Checker](https://billionverify.com/bounce-email-checker.md)
- [Catch-All Verifier](https://billionverify.com/catch-all-verifier.md)
- [Role Account Detection](https://billionverify.com/role-account-detection.md)


**Email Tools:**
- [Email Extractor](https://billionverify.com/email-extractor.md)
- [Email Deliverability Test](https://billionverify.com/email-deliverability-test.md)


**Google Maps:**
- [Google Maps Overview](https://billionverify.com/google-maps.md)
- [Google Maps Email Extractor](https://billionverify.com/google-maps/google-maps-email-extractor.md)
- [Google Maps Leads Scraper](https://billionverify.com/google-maps/google-maps-leads-scraper.md)
- [Google Maps Email Finder](https://billionverify.com/google-maps/google-maps-email-finder.md)
- [Outscraper Email Verification](https://billionverify.com/google-maps/outscraper.md)
- [Scrap.io Email Verification](https://billionverify.com/google-maps/scrap-io.md)
- [Apify Email Verification](https://billionverify.com/google-maps/apify.md)

**Cold Email:**
- [Cold Email Overview](https://billionverify.com/cold-email.md)
- [GMass Email Verification](https://billionverify.com/cold-email/gmass.md)
- [Instantly Email Verification](https://billionverify.com/cold-email/instantly.md)
- [Smartlead Email Verification](https://billionverify.com/cold-email/smartlead.md)
- [Lemlist Email Verification](https://billionverify.com/cold-email/lemlist.md)
- [Mailshake Email Verification](https://billionverify.com/cold-email/mailshake.md)
- [Reply.io Email Verification](https://billionverify.com/cold-email/reply-io.md)

**B2B Leads:**
- [B2B Leads Overview](https://billionverify.com/b2b-leads.md)
- [Apollo Email Verification](https://billionverify.com/b2b-leads/apollo.md)
- [Hunter Email Verification](https://billionverify.com/b2b-leads/hunter.md)
- [ZoomInfo Email Verification](https://billionverify.com/b2b-leads/zoominfo.md)
- [Lusha Email Verification](https://billionverify.com/b2b-leads/lusha.md)
- [LinkedIn Sales Navigator](https://billionverify.com/b2b-leads/linkedin-sales-navigator.md)
- [Snov.io Email Verification](https://billionverify.com/b2b-leads/snov-io.md)

**Local Business:**
- [Local Business Overview](https://billionverify.com/local-business.md)
- [Yellow Pages Email Verification](https://billionverify.com/local-business/yellow-pages.md)
- [Yelp Email Verification](https://billionverify.com/local-business/yelp.md)
- [Angi Email Verification](https://billionverify.com/local-business/angi.md)
- [Local Business List Cleaning](https://billionverify.com/local-business/local-business-email-list-cleaning.md)

**B2B Agency:**
- [B2B Agency Overview](https://billionverify.com/b2b-agency.md)
- [Clutch Email Verification](https://billionverify.com/b2b-agency/clutch.md)
- [G2 Email Verification](https://billionverify.com/b2b-agency/g2.md)
- [Trustpilot Email Verification](https://billionverify.com/b2b-agency/trustpilot.md)
- [Agency Email Finder](https://billionverify.com/b2b-agency/agency-email-finder-workflow.md)


**Integrations:**
- [Integrations Overview](https://billionverify.com/integrations.md)
- [Mailchimp Integration](https://billionverify.com/integrations/mailchimp.md)
- [HubSpot Integration](https://billionverify.com/integrations/hubspot.md)
- [Salesforce Integration](https://billionverify.com/integrations/salesforce.md)
- [SendGrid Integration](https://billionverify.com/integrations/sendgrid.md)
- [Klaviyo Integration](https://billionverify.com/integrations/klaviyo.md)
- [ActiveCampaign Integration](https://billionverify.com/integrations/activecampaign.md)
- [Zapier Integration](https://billionverify.com/integrations/zapier.md)
- [Make Integration](https://billionverify.com/integrations/make.md)
- [Pipedrive Integration](https://billionverify.com/integrations/pipedrive.md)
- [Integrately Integration](https://billionverify.com/integrations/integrately.md)


**Comparisons:**
- [Comparisons Overview](https://billionverify.com/vs.md)
- [Alternative to NeverBounce](https://billionverify.com/vs/neverbounce.md)
- [Alternative to ZeroBounce](https://billionverify.com/vs/zerobounce.md)
- [Alternative to Hunter](https://billionverify.com/vs/hunter.md)
- [Alternative to Kickbox](https://billionverify.com/vs/kickbox.md)
- [Alternative to EmailListVerify](https://billionverify.com/vs/emaillistverify.md)
- [Alternative to MillionVerifier](https://billionverify.com/vs/millionverifier.md)
- [Alternative to Emailable](https://billionverify.com/vs/emailable.md)
- [Alternative to Bouncer](https://billionverify.com/vs/bouncer.md)
- [Alternative to Verifalia](https://billionverify.com/vs/verifalia.md)
- [Alternative to DeBounce](https://billionverify.com/vs/debounce.md)
- [Alternative to Validity](https://billionverify.com/vs/validity.md)
- [Alternative to VoilaNorbert](https://billionverify.com/vs/voilanorbert.md)
- [Alternative to Reoon](https://billionverify.com/vs/reoon.md)

**Resources:**
- [Documentation](https://billionverify.com/docs.md)
- [Blog](https://billionverify.com/blog.md)
- [Email Glossary](https://billionverify.com/glossary.md)
- [Benchmark Report](https://billionverify.com/benchmark.md)
- [About](https://billionverify.com/about.md)