Anthropic Claude API

anthropic.com

A RESTful API providing programmatic access to Anthropic's Claude language models for messages, batches, token counting, files, skills, and managed agents.

The Anthropic Claude API API uses api key authentication; has usage based pricing; rate limits: Enforced per usage tier as requests/min (RPM), input tokens/min (ITPM), and output tokens/min (OTPM) per model; Managed Agents: 300 create RPM, 1,200 read RPM; 429 errors with retry-after header. Verified 2026-07-12 with per-field source links.

AI & Machine Learning Verified 2026-07-12 medium confidence

Base URL

https://api.anthropic.com

platform.claude.com ↗

Auth

api_key

platform.claude.com ↗

Free tier

not documented null

no source

Pricing model

usage_based

platform.claude.com ↗

Pricing

Tiered spend caps: Start $500/mo, Build $1,000/mo, Scale $200,000/mo, Custom negotiated; Message Batches offer 50% cost reduction

platform.claude.com ↗

Rate limits

Enforced per usage tier as requests/min (RPM), input tokens/min (ITPM), and output tokens/min (OTPM) per model; Managed Agents: 300 create RPM, 1,200 read RPM; 429 errors with retry-after header

platform.claude.com ↗

OpenAPI spec

not documented null

no source

MCP server

not documented null

no source