---
title: "Reverse Email Lookup"
method: POST
path: "/reverse_email_lookup"
tags: ["Reverse Lookups"]
---

# Reverse Email Lookup

`POST /reverse_email_lookup`

## Request

- Base URL: `https://api.moltsets.com/api/v1/tools`
- URL: `https://api.moltsets.com/api/v1/tools/reverse_email_lookup`
- Auth: HTTP bearer

The Reverse Email Lookup API resolves an email address into a complete business profile, including full name, job title, seniority, company, LinkedIn URL, firmographic data, and any other email addresses on file.

It supports single lookups (`email`) and batch lookups of up to 100 addresses at once (`emails`). Each address in a batch counts as one request against your Fair Use requests limit.

**Use this endpoint to:**
- Enrich inbound leads and form fills with full contact context
- Qualify a prospect before you reach out
- Fill in missing profile data on an existing email list

**Fair Use Policy:**
This API is subject to our <a href="https://moltsets.com/fair-use-policy-enrichment/" target="_blank" rel="noopener">Fair Use Policy for Enrichment</a>.

**Outcomes:**
A lookup that finds nothing is not an error. It returns HTTP `200` with `status: "not_found"`, empty or null `results`, and the usual `metadata` — and costs no tokens, though it still counts as one request against your Fair Use requests limit. Read `status`, not the HTTP code, to tell a hit from a miss. The API's only `404` is an unknown or retired tool name.

## Headers

- `User-Agent` string, required

## Request body

- object
  - `email` string: Single email address.
  - `emails` string[]: Batch of email addresses, up to 100. Can't be combined with `email`.

## Response `200`

Success

## Other responses

- `401`: Unauthorized
- `402`: Payment Required — insufficient tokens
- `403`: Forbidden — missing `User-Agent` header, tool not on the plan, or account inactive
- `422`: Invalid Input — malformed body, or a parameter is missing, malformed, or outside its allowed values
- `429`: Too Many Requests — rate limit or Fair Use window exhausted
- `500`: Internal Server Error — the call could not complete. Usually the endpoint is temporarily unavailable, but an oversized request can also cause it. Retry with a smaller request first; the MoltSets team is alerted automatically.

---

[API](https://skmtc.dev/moltsets/apis/moltsets-api.md) - [All operations](https://skmtc.dev/moltsets/apis/moltsets-api/llms.txt) - [OpenAPI document](https://skmtc.dev/moltsets/apis/moltsets-api/revisions/b116df68bd90?raw)