# cURL

**Canonical:** https://apis.io/providers/curl/  
**Website:** https://curl.se/  
**APIs profiled:** 2

cURL is a command-line tool and library for transferring data with URLs. Originally released in 1997 by Daniel Stenberg, cURL is the de facto standard tool used by developers for testing, automating, and scripting interactions with HTTP, HTTPS, FTP, and many other URL-based protocols. It ships in two primary forms - the curl command-line binary used directly in shells and scripts, and libcurl, a portable C library that powers data transfer features inside thousands of applications, operating systems, devices, and programming languages.

## Kin Score — 12.1 / 100 (emerging)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 12.1).

| Facet | Score |
|---|---|
| Discoverability | 59.3 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 18.4 |
| Developer Ergonomics | 7.1 |
| Commercial Clarity | 15.8 |
| Access Clarity | 15.8 |

Regulatory layer — **Education & Research**: 22.2 (matched via tags).

## Agent readiness — 3.0 (human-only)

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

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (2)

- **cURL Command Line Tool** — The curl command-line tool transfers data to or from a server using URL syntax, supporting protocols including DICT, FILE, FTP, FTPS, GOPHER, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDA...
- **libcurl** — libcurl is a free, easy-to-use, thread-safe, IPv6-compatible client-side URL transfer library written in C with a stable API and ABI. It supports the same broad set of protocols...

## Security (2)

- **Curl Domain Security** — TLSv1.3 · HSTS
- **Curl Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Curl Plans Pricing**

## Tags

API Client, Command Line, Data Transfer, FTP, HTTP, HTTPS, Library, Network Tools, Open-Source, REST

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