> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://documentation.apexverify.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://documentation.apexverify.com/_mcp/server.

# List Verification

You can find the same tutorial in the [Your First Upload](/quickstart/your-first-upload) quickstart guide.

List verification is the most common ApexVerify workflow. You upload a `.txt` file of emails or phone numbers, configure parameters, trigger parsing, and launch — the platform processes every record and returns detailed per-row results.

## Cost optimization tips

**Use caching to reduce costs.** When `use_account_cache` and `use_global_cache` are enabled (both default to `true`), you get a **50% credit refund** for any record that hits the cache. For lists with significant overlap across campaigns, this can cut your verification costs substantially.

Configure `max_account_cache_backoff` and `max_global_cache_backoff` (1–180 days) to control how far back the system looks. A lower backoff means fresher results; a higher backoff means more cache hits and lower cost.