# 1Lookup REST API

**Canonical:** https://apis.io/apis/1lookup/1lookup-rest-api/  
**Provider:** 1Lookup — https://apis.io/providers/1lookup/  
**Base URL:** https://app.1lookup.io/api/v1  
**Documentation:** https://app.1lookup.io/api

1Lookup REST API is one of 3 APIs that [1Lookup](https://apis.io/providers/1lookup/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Phone Validation, Email Validation, IP Intelligence, Fraud and Risk, and Data Enrichment. The published artifact set on APIs.io includes API documentation, an API reference, a getting-started guide, authentication docs, and rate-limit docs.

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-scoped), JSON bodies, one response envelope on every product, and job-based bulk processing up to 100,000 rows with an Idempotency-Key contract and signed webhook callbacks. 46 documented operations, almost all POST, priced against a universal credit balance. No OpenAPI or other machine-readable contract is published.

## Machine-readable artifacts (13)

- **Documentation** — https://app.1lookup.io/api
- **APIReference** — https://app.1lookup.io/api#endpoints
- **GettingStarted** — https://app.1lookup.io/api#getting-started
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/authentication/1lookup-authentication.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/conventions/1lookup-conventions.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/errors/1lookup-problem-types.yml
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/rate-limits/1lookup-rate-limits.yml
- **Lifecycle** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/lifecycle/1lookup-lifecycle.yml
- **Idempotency** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/conventions/1lookup-conventions.yml
- **Webhooks** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/asyncapi/1lookup-webhooks.yml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/data-model/1lookup-data-model.yml
- **Examples** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/examples/1lookup-examples.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/1lookup/refs/heads/main/apis.yml

## Other 1Lookup APIs (2)

- [1Lookup MCP Server](https://apis.io/apis/1lookup/1lookup-mcp-server/)
- [1Lookup LLMs Index](https://apis.io/apis/1lookup/1lookup-llms-index/)

## Tags

Phone Validation, Email Validation, IP Intelligence, Fraud and Risk, Data Enrichment, B2B contact & company data, SEO / web analytics, Audio Transcription, REST API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/1lookup/1lookup-rest-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/1lookup/.