# Billionverify

> Verify email addresses using the BillionVerify API. Use when user wants to verify single emails, batch verify email lists, upload files for bulk verification, check credit balance, or manage webhooks.

- Skill: `modbender/billionverify` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add modbender/billionverify`
- Raw SKILL.md: https://api.skillmd.com/api/skills/modbender/billionverify/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: modbender (https://skillmd.com/u/modbender)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/modbender/billionverify

---


# BillionVerify API Skill

Call the [BillionVerify](https://billionverify.com/) API to verify email addresses — single, batch, or bulk file processing.

## Setup

API key must be set in environment variable `BILLIONVERIFY_API_KEY`.
Get your API key at: https://billionverify.com/auth/sign-in?next=/home/api-keys

## Base URL

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

## Authentication

All requests require an API key header:
```bash
-H "BV-API-KEY: $BILLIONVERIFY_API_KEY"
```

## Endpoints

### Verify Single Email
```bash
curl -X POST "https://api.billionverify.com/v1/verify/single" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "user@example.com",
    "check_smtp": true
  }'
```

Response includes: `status` (valid/invalid/unknown/risky/disposable/catchall/role), `score` (0-1), `is_deliverable`, `is_disposable`, `is_catchall`, `is_role`, `is_free`, `domain`, `domain_age`, `mx_records`, `domain_reputation`, `smtp_check`, `reason`, `suggestion`, `response_time`, `credits_used`.

### Verify Batch Emails (max 50)
```bash
curl -X POST "https://api.billionverify.com/v1/verify/bulk" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "emails": ["user1@example.com", "user2@example.com"],
    "check_smtp": true
  }'
```

### Upload File for Bulk Verification
Upload CSV, Excel (.xlsx/.xls), or TXT files (max 20MB, 100,000 emails):
```bash
curl -X POST "https://api.billionverify.com/v1/verify/file" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY" \
  -F "file=@/path/to/emails.csv" \
  -F "check_smtp=true" \
  -F "email_column=email" \
  -F "preserve_original=true"
```

Returns `task_id` for tracking the async job.

### Get File Job Status
Supports long-polling with `timeout` parameter (0-300 seconds):
```bash
curl -X GET "https://api.billionverify.com/v1/verify/file/{task_id}?timeout=30" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY"
```

Status values: `pending`, `processing`, `completed`, `failed`.

### Download Verification Results
Without filters returns redirect to full result file. With filters returns CSV of matching emails (filters combined with OR logic):
```bash
curl -X GET "https://api.billionverify.com/v1/verify/file/{task_id}/results?valid=true&invalid=true" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY" \
  -L -o results.csv
```

Filter parameters: `valid`, `invalid`, `catchall`, `role`, `unknown`, `disposable`, `risky`.

### Get Credit Balance
```bash
curl -X GET "https://api.billionverify.com/v1/credits" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY"
```

### Create Webhook
```bash
curl -X POST "https://api.billionverify.com/v1/webhooks" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "https://your-app.com/webhooks/billionverify",
    "events": ["file.completed", "file.failed"]
  }'
```

The `secret` is only returned on creation — store it securely.

### List Webhooks
```bash
curl -X GET "https://api.billionverify.com/v1/webhooks" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY"
```

### Delete Webhook
```bash
curl -X DELETE "https://api.billionverify.com/v1/webhooks/{webhook_id}" \
  -H "BV-API-KEY: $BILLIONVERIFY_API_KEY"
```

### Health Check (no auth required)
```bash
curl -X GET "https://api.billionverify.com/health"
```

## Credits & Billing

- **Invalid** / **Unknown**: 0 credits (free)
- All other statuses (valid, risky, disposable, catchall, role): 1 credit each

## Rate Limits

| Endpoint | Limit |
|----------|-------|
| Single Verification | 6,000/min |
| Batch Verification | 1,500/min |
| File Upload | 300/min |
| Other endpoints | 200/min |

## User Request

$ARGUMENTS