1Lookup
Phone, email and IP validation plus contact enrichment on one credit-based API and MCP server.
From $99/mo 7-day free trial MCP server API
Bottom line
One API for checking phone numbers, emails and IP addresses before they reach your dialer, sequencer or ATS, with contact enrichment and B2B data on the same credits. Plans start at $99/mo for 20,000 checks with a 7-day free trial, so it suits teams verifying in volume rather than a few lists a month.
Stands out for: Phone checks are the strength: line type, carrier and DNC status come from FCC and carrier data refreshed daily, so recruiters can drop landlines and do-not-call numbers before a texting or calling campaign. Email, IP and enrichment lookups share the same balance, unused credits roll over for 3 months, and an MCP server lets Claude run checks directly.
Watch out for: There is no free plan or pay-as-you-go pack; the cheapest option is a $99/mo subscription, which is a lot if you only verify a few hundred emails. Enrichment gets expensive fast at 10 to 75 credits a lookup. It is an API and dashboard product with no recruiting workflow, and the MCP server covers only validation, not enrichment.
Overview
1Lookup is a data API that checks whether contact details are real before you use them. A phone lookup returns the line type (mobile, landline or VoIP), carrier and do-not-call status from FCC and carrier data updated daily. An email lookup runs SMTP mailbox and disposable-domain checks, and an IP lookup flags proxies and VPNs. Each check comes back with a risk score in under 0.3 seconds and costs 1 credit.
The same key and balance cover 43 products beyond validation: reverse phone, email and IP lookups, email and phone append, a mobile finder, B2B contact append, LinkedIn profile and company lookups, company firmographics, social profile data, SEO metrics and audio transcription. These cost 2 to 86 credits each. Lists can be uploaded as CSV files of up to 2 million rows, and 1,000 requests a minute are included.
For AI agents, 1Lookup runs an MCP server that Claude, Cursor and other clients connect to with an OAuth sign-in, exposing phone, email and IP validation, bulk verification and an account check. Plans run from $99/mo for 20,000 credits to $1,999/mo for 1,000,000, with a 7-day free trial and credits that roll over for 3 months.
Who it's for
Best for
- Agencies running texting or calling campaigns that need to scrub numbers for line type and DNC
- Teams verifying emails and phones in bulk before loading them into an ATS or sequencer
- Developers who want validation and enrichment behind one API key
- Claude users who want to verify contacts from a chat
Not ideal for
- Recruiters verifying a few hundred emails a month (a pay-per-credit verifier costs less)
- Buyers who want a free plan
- Teams looking for a sourcing database or outreach tool
Key features
Validation. Phone checks return line type, carrier and DNC status from daily FCC and carrier data, email checks run SMTP mailbox and disposable-domain tests, and IP checks flag proxies and VPNs, each with a risk score in under 0.3 seconds.
Enrichment and prospecting. Reverse phone and email lookups, email and phone append, a mobile finder, B2B contact append, LinkedIn profile and company lookups, and company firmographics from the same key.
Bulk and agent access. CSV uploads of up to 2 million rows, 1,000 requests a minute included, and an MCP server with OAuth sign-in for Claude and Cursor.
MCP server
https://app.1lookup.io/api/mcp
1Lookup runs its own MCP server at https://app.1lookup.io/api/mcp (Streamable HTTP). Sign in with OAuth, no API key needed. It exposes five tools: validate_phone, verify_email, ip_lookup, bulk_verify and get_account, and tool calls spend the same credits as the REST API.
Setup steps and live status MCP Directory Check your stack in the MCP readiness checker
Pricing
| Plan | Price | What you get |
|---|---|---|
| Starter | $99/mo | 20,000 credits ($4.95 per 1,000 checks) |
| Growth | $299/mo | 85,000 credits ($3.52 per 1,000) |
| Professional | $799/mo | 250,000 credits ($3.20 per 1,000) |
| Enterprise | $1,999/mo | 1,000,000 credits ($2.00 per 1,000) |
Four monthly plans, all drawing on one credit balance. Starter is $99/mo for 20,000 credits, Growth $299/mo for 85,000, Professional $799/mo for 250,000 and Enterprise $1,999/mo for 1,000,000; custom plans start at $2,000/mo. Phone, email, IP and spam checks cost 1 credit each, while enrichment costs more (reverse lookups and email or phone append 10 credits, mobile finder 40, B2B contact append 75). Unused credits roll over for 3 months, annual billing takes about two months off, and every plan starts with a 7-day free trial ($5 of credits on Starter, $20 on larger plans). Confirm current terms on the vendor site.
Checked 19 Oct 2026. Vendors change prices without notice.
Is 1Lookup expensive?
1Lookup starts at $99/mo. We list 33 verification tools in total. 12 have a free tier, and those with a public price typically start around $39 a month.
- 1 quote-based
- 12 free tier
- 32 public price
Worked out automatically from every verification listing, so it updates as the directory changes.
Pros and cons
Pros
- Daily FCC and carrier data for phone line type and DNC
- Validation and enrichment share one credit balance
- First-party MCP server with OAuth sign-in
Cons
- No free plan; starts at $99/mo
- Enrichment lookups cost 10 to 75 credits each
- MCP server covers validation only
Integrations
REST API CSV upload MCP Claude Cursor
What's new at 1Lookup
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How 1Lookup compares
See all 1Lookup alternatives, with what each one does differently and a head to head for every pairing.
| Tool | Free tier | From | MCP | API | Compare |
|---|---|---|---|---|---|
| 1Lookup (this tool) | – | $99/mo | ✓ | ✓ | |
| | ✓ | $39/2,000 credits | ✓ | ✓ | Compare |
| | – | $9/10k credits | ✓ | ✓ | Compare |
| | – | $39/mo | ✓ | ✓ | Compare |
$39/2,000 credits Free tier MCP API
Email-only verifier with 100 free checks a month and credit packs from $39, cheaper for small email lists.
$9/10k credits MCP API
Email verification with 1,000 free credits and paid credits from $9 per 10,000, if you do not need phone checks.
$39/mo MCP API
People and company data API with its own MCP server from $39/mo, if you need enrichment more than validation.
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