# 1Lookup, $99 monthly, Starter, POST /reverse-email-append: Reverse email lookup API

> Identity enrichment from an email address.

1Lookup's reverse email lookup API on its Starter plan, $49.50 per 1,000 people. 1 of the 13 key fields: Location.
The median plan costs $10.80 per 1,000. This plan costs less than 13% of the 199 priced plans.

- This page: https://datacircle.dev/reverse-email-lookup-apis/1lookup/99-monthly-starter-post-reverse-email-append
- Get it: https://www.1lookup.io/pricing
- Its API docs: https://www.1lookup.io/docs
- Sold by: 1Lookup (https://www.1lookup.io)
- Checked: 2026-10-20

## In the answer

- Completeness: 8%
- Location: ✓

## Price

- $ per 1,000: $49.50
- Billing: monthly
- $ a month: $99

## Aggregators

- Aggregators: none

## Charges

- Repeat free: 7 days
- Per: call
- Also pays for: from the same budget: every other 1Lookup product: one universal credit balance

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Identity enrichment from an email address.

## Data

- Keep data: your subscription term: Output Data may not be retained after the subscription terminates, except as required by law
- Use data: we grant you a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to access and use the Service, and to use Output Data, for your internal business purposes during your subscription term, You must not, and must not permit any third party to: Resell, sublicense, rent, lease, distribute, or otherwise make the Service or Output Data available to any third party, except as expressly permitted in writing by us, Build, populate, enrich, or maintain a competing or substitute database, list, or product from Output Data, or use Output Data to train any machine learning or artificial intelligence model, Copy, scrape, cache, or store Output Data beyond what is reasonably necessary for your internal business use, or retain Output Data after your subscription terminates except as required by law, Reverse engineer, decompile, or disassemble any part of the Service, or attempt to discover its source code, underlying data sources, algorithms, or scoring logic, Circumvent or attempt to circumvent any rate limit, quota, usage limit, authentication, or access control, Remove, obscure, or alter any proprietary notice, or misrepresent the source of Output Data, Use the Service to benchmark against a competing product, or publish performance or accuracy comparisons, without our prior written consent, Access the Service by any automated means other than our documented APIs, or use the Service in a manner that interferes with its integrity, security, or performance [...] You must not use the Service, or Output Data, to: Violate any applicable law, regulation, or third-party right, Send, or enable others to send, unlawful telemarketing, robocalls, spam, or unsolicited or non-consented calls, texts, faxes, or emails, Harass, stalk, threaten, defraud, extort, dox, discriminate against, or harm any person, or facilitate any of the foregoing, Determine any person's eligibility for credit, insurance, employment, housing, government benefits, or any other purpose governed by the Fair Credit Reporting Act, as further described in Section 9, Identify, locate, surveil, or track any individual without a lawful basis, or to skip-trace or investigate any individual in violation of law, Collect, compile, enrich, sell, or license personal data without a lawful basis and required consents, Build, train, or improve a competing product, dataset, list, or machine learning or artificial intelligence model, Resell, redistribute, or provide the Service or Output Data to third parties [...]

## Plan

- Pay: $99
- You get: 20,000 credits a month
- Enough for: 2,000 calls a month
- Expires: unused credits roll over for up to 3 months

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /reverse-email-append

## About the plan

- Plan: Starter
- Who can get it: anyone with a business name and a working business email address

## The 30 fields the plan's answer can hold

success, request ID, request type, input, credits used, credits remaining, cache hit, matched, email, first name, last name, full name, address, address line 1, city, state, ZIP code, country, phone, phone DNC, cell, cell DNC, phones, company name, company job title, company industry, company LinkedIn URL, company website, company country, lookup type

## 1Lookup's plans (9)

- [1Lookup, $99 monthly, Starter, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/99-monthly-starter-post-reverse-email-append/llms.txt): $49.50 per 1,000, 8% complete
- [1Lookup, $299 monthly, Growth, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/299-monthly-growth-post-reverse-email-append/llms.txt): $35.176 per 1,000, 8% complete
- [1Lookup, $799 monthly, Professional, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/799-monthly-professional-post-reverse-email-append/llms.txt): $31.96 per 1,000, 8% complete
- [1Lookup, $1,999 monthly, Enterprise, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/1999-monthly-enterprise-post-reverse-email-append/llms.txt): $19.99 per 1,000, 8% complete
- [1Lookup, $990 yearly, Starter (annual), POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/990-yearly-starter-annual-post-reverse-email-append/llms.txt): $41.25 per 1,000, 8% complete
- [1Lookup, $2,990 yearly, Growth (annual), POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/2990-yearly-growth-annual-post-reverse-email-append/llms.txt): $29.314 per 1,000, 8% complete
- [1Lookup, $7,990 yearly, Professional (annual), POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/7990-yearly-professional-annual-post-reverse-email-append/llms.txt): $26.633 per 1,000, 8% complete
- [1Lookup, $19,990 yearly, Enterprise (annual), POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/19990-yearly-enterprise-annual-post-reverse-email-append/llms.txt): $16.658 per 1,000, 8% complete
- [1Lookup, contact us, Custom enterprise, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/contact-us-custom-enterprise-post-reverse-email-append/llms.txt): 8% complete

## 1Lookup's calls (2)

- `POST /bulk/jobs`: [1Lookup, $99 monthly, Starter, POST /bulk/jobs](https://datacircle.dev/reverse-email-lookup-apis/1lookup/99-monthly-starter-post-bulk-jobs/llms.txt)
- `POST /reverse-email-append`: [1Lookup, $99 monthly, Starter, POST /reverse-email-append](https://datacircle.dev/reverse-email-lookup-apis/1lookup/99-monthly-starter-post-reverse-email-append/llms.txt)

## Similar plans of other providers

- [Findymail, $49 monthly](https://datacircle.dev/reverse-email-lookup-apis/findymail/49-monthly/llms.txt): $49.00 per 1,000, 54% complete
- [CompanyEnrich, $49 monthly](https://datacircle.dev/reverse-email-lookup-apis/companyenrich/49-monthly/llms.txt): $49.00 per 1,000, 31% complete, stored
- [FullEnrich, $499 monthly](https://datacircle.dev/reverse-email-lookup-apis/fullenrich/499-monthly/llms.txt): $49.90 per 1,000, 62% complete, live
- [Limadata, $100 monthly](https://datacircle.dev/reverse-email-lookup-apis/limadata/100-monthly/llms.txt): $50.00 per 1,000, 0% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

- https://www.1lookup.io/docs
- https://www.1lookup.io/llms.txt
- https://www.1lookup.io/openapi.json
- https://www.1lookup.io/pricing
- https://www.1lookup.io/products/email-enrichment
- https://www.1lookup.io/products/hlr-lookup
- https://www.1lookup.io/terms