# 1Lookup

**Canonical:** https://apis.io/providers/1lookup/  
**Website:** https://www.1lookup.io  
**APIs profiled:** 3

1Lookup is a self-serve data verification and enrichment platform for SMBs, exposing more than forty products through a single REST API and one universal credit balance. It validates phone numbers (line type, carrier, HLR reachability, number portability, DNC status, spam/scam reputation, fraud score), email addresses (syntax, MX, deliverability, disposable and role-based detection) and IP addresses (geolocation, VPN/proxy/Tor and datacenter detection), then extends into B2B company and contact data (firmographics, prospect and account search, contact append, skip trace), SEO and web intelligence (domain authority, backlinks, keyword metrics, audience reports, SERP and website scraping), social and media lookups, property data and audio transcription. The same engine powers a web dashboard with batch CSV validation, roughly twenty-five free rate-limited browser tools, and a first-party hosted MCP connector authorized with OAuth 2.1 that gives AI agents five of the core tools without an API key.

## Kin Score — 62.4 / 100 (strong)

Scored 2026-08-17 under rubric 0.11.0. Trend: rising (+15.3 from 47.1).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 51.6 |
| Governance | 12.5 |
| Operational Transparency | 50.0 |
| Developer Ergonomics | 69.0 |
| Commercial Clarity | 92.1 |

## Agent readiness — 55.0 (agent-native)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| MCP Server | yes |
| Auth Clarity | yes |
| Idempotency | documented |
| Error Semantics | documented |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (3)

- **1Lookup REST API** — RESTful API over HTTPS covering all 1Lookup products (phone/email/IP validation, fraud, enrichment, B2B data, SEO intelligence). API-key Bearer auth (sk_live_ keys, organization...
- **1Lookup MCP Server** — First-party hosted/remote MCP connector with OAuth 2.1 auth (authorization code + PKCE, dynamic client registration, single `lookup` scope) exposing 5 tools (validate_phone, ver...
- **1Lookup LLMs Index** — Machine-readable content indexes (llms.txt and llms-full.txt) for AI and answer engines, indexing the free tools, every product page, the comparison pages and the key site secti...

## MCP servers (2)

- **mcp**
- **1lookup-mcp.yml**

## Security (4)

- **1Lookup Authentication** — http/oauth2 · 2 schemes
- **1Lookup Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **1Lookup Vulnerability Disclosure** — Hackerone · contact published
- **1Lookup Trust Center** — trust center published

## Plans (1)

- **1Lookup Plans Pricing**

## Tags

phone validation, email validation, IP intelligence, fraud & risk, data enrichment, B2B contact & company data, SEO / web analytics, audio transcription, MCP / agent-native, REST API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/1lookup/). Scores are computed from the provider's own public artifacts under a published rubric.