1Lookup is an email verification API and phone validation API on one key, from $99 a month.
1Lookup is a data validation API for phone numbers, email addresses and IP addresses, with 74 products behind one key and plans from $99 a month.
A core check of a phone number, an email address or an IP address costs 1 credit, and the same credits cover the other products, from domain and company data to spam scoring. A hosted MCP server lets AI assistants run lookups too.
Here is what the 1Lookup phone and email validation API offers.
74 products behind one API key1
Phone, email, IP, domain and company data share one login and one set of credits.
From $99 a month with 20,000 credits2
Starter has 20,000 credits, Growth has 85,000 at $299, Professional has 250,000 at $799 and Enterprise has 1,000,000 at $1,999 a month.
Core checks cost 1 credit each2
A phone, email, IP or spam check is 1 credit on every plan, from the same balance as every other product.
Answers in under 0.3 seconds1
Line type and carrier data come direct from FCC and carrier sources, updated daily.
Works from AI assistants1
A hosted MCP server lets Claude, ChatGPT, Cursor and VS Code run lookups, with sign-in by OAuth and no API key to paste.
A 7-day free trial on every plan2
Every plan is free for 7 days and then $99 a month on Starter.
Here is what the 1Lookup email verification and phone lookup API does.
01
Phone number validation and lookup
A number is validated in real time with its carrier, line type, porting status and a risk level, using phone data that is updated daily.3
02
Email verification
Real-time SMTP and mailbox checks catch invalid, disposable and undeliverable addresses, and report whether an address is deliverable, disposable or tied to a role such as info@.1
03
One endpoint for each check
Line status, mailbox checks, IP risk, spam scores, fraud scans, bulk jobs and company data each have their own endpoint, all on the same key.1
04
Lookups from inside AI assistants
One URL, https://app.1lookup.io/api/mcp, is the whole integration: sign-in is by OAuth with no API key, five tools run phone, email, IP and bulk checks, and calls spend the same credits as the REST API.1
Spam and risk scoring
It flags spam, robocallers and risky numbers before they reach a business's users, with a spam score from 0 to 100 and daily or weekly monitoring.1
IP intelligence
It spots proxies, VPNs and Tor exit nodes, checks against three public spam blocklists and scores each login for risk.1
Social media data from 13 platforms
Seven APIs pull live public data from 13 social platforms, and a lookup that finds nothing costs nothing.1
Dashboard, lists and integrations
A dashboard shows credits, lookups and success rate by day, whole spreadsheets can be uploaded, and 124 step-by-step guides cover HubSpot, Salesforce, Pipedrive, Zapier, Make and n8n among others.1
1Lookup API pricing starts at $99 a month for 20,000 credits.
- Starter$99 a month
- Growth$299 a month
- Professional$799 a month
- Enterprise$1,999 a month
Starter$99 a month2
20,000 credits, listed at $0.0050 a lookup, with email support
Growth$299 a month2
85,000 credits, listed at $0.0035 a lookup, with priority email and chat support
Professional$799 a month2
250,000 credits, listed at $0.0032 a lookup, with chat and a live meeting
Enterprise$1,999 a month2
1,000,000 credits, listed at $0.0020 a lookup, with a dedicated customer success manager
Prices are per month, annual billing gives 2 months free, and a custom plan starting at $2,000 a month exists above 1,000,000 credits.
The facts about 1Lookup, each with the day it was read.
- Products
- 74 products behind one API key and one set of credits1
- Free trial
- 7 days on every plan, then the plan's price2
- Cost per check
- 1 credit for a phone, email, IP or spam check, and 2 to 86 credits for the enrichment and intelligence products2
- Speed
- Under 0.3 seconds per verification1
- Phone data
- Updated daily from FCC and carrier sources, covering US, Canadian and international numbers1
- AI assistants
- A hosted MCP server connects ChatGPT, Claude, Cursor, Grok and VS Code, with sign-in by OAuth and no API key1
- Business software
- HubSpot, Salesforce, Pipedrive and Zoho CRM are listed as integrations, with native apps on Zapier, Make and n8n1
- Annual billing
- 2 months free, and a custom plan starting at $2,000 a month above 1,000,000 credits2
- Started
- 20253
Here is what customers publish about 1Lookup.
... They listen, they iterate, and they keep improving. You can feel there are actual engineers behind it, not just salespeople.
Bùi Thị Thanh Ngọc, Trustpilot, 19 October 2025
Here is how 1Lookup compares with Abstract API and Twilio Lookup.
1Lookup puts phone, email and IP checks on one API key and one credit balance, across 74 products.
How checks are billed
1Lookup
One API key and one credit balance for 74 products, and a core check is 1 credit
Abstract API
Abstract prices each API on its own meter, so email validation API pricing, phone validation API pricing and IP geolocation API pricing are separate lines on your bill
Twilio Lookup
Advanced carrier and risk intelligence features are billed individually, per request
Each rival's cells use the words of its own price page, read on the day shown above.
Questions people ask about email verification and phone validation APIs.
Which API verifies emails and validates phone numbers with one key?
1Lookup checks phone numbers, email addresses and IP addresses with one API key, across 74 products, and validation answers in under 0.3 seconds.
What is an email verification API?
It checks an address before a message is sent, and 1Lookup's version runs real-time SMTP and mailbox checks, spots disposable domains and reports whether an address is deliverable, disposable or tied to a role, for 1 credit.
What does a phone validation API check?
1Lookup validates a number in real time with its carrier, line type, porting status and a risk level, from data updated daily, for US, Canadian and international numbers.
How much does 1Lookup cost?
Plans run from $99 a month for 20,000 credits to $1,999 a month for 1,000,000 credits, and a core check costs 1 credit.
Is there a free trial?
Yes: every plan starts with a 7-day free trial.
Can an AI assistant run 1Lookup checks?
Yes: a hosted MCP server at one URL works with Claude, ChatGPT, Cursor, Grok and VS Code, signs in by OAuth with no API key and spends the same credits as the REST API.
Which checks does 1Lookup cover?
Phone, email and IP checks, spam and risk scoring, domain and company data and social media data, with 74 products in all.
Where each fact on this page comes from.
- 11Lookup home page 1lookup.io, read 31 October 2026
- 21Lookup pricing page 1lookup.io, read 31 October 2026
- 31Lookup about page 1lookup.io, read 31 October 2026
Israel.com wrote this page from the public pages above.