# Anthropic Token Counting API

**Canonical:** https://apis.io/apis/anthropic/anthropic-token-counting-api/  
**Provider:** Anthropic — https://apis.io/providers/anthropic/  
**Documentation:** https://docs.anthropic.com/en/api/messages-count-tokens

Anthropic Token Counting API is one of 24 APIs that [Anthropic](https://apis.io/providers/anthropic/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Artificial Intelligence, Counting, and Tokens. The published artifact set on APIs.io includes API documentation and an OpenAPI specification.

Count the number of tokens in a Message, including tools, images, and documents, without creating it. The Token Count API accepts the same structured list of inputs as Messages including system prompts, tools, images, and PDFs. Free to use but subject to requests-per-minute rate limits.

## Machine-readable artifacts (2)

- **Documentation** — https://docs.anthropic.com/en/api/messages-count-tokens
- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/anthropic/refs/heads/main/openapi/anthropic-token-counting-api-openapi.yml

## Other Anthropic APIs (12)

- [Anthropic Messages API](https://apis.io/apis/anthropic/anthropic-messages-api/)
- [Anthropic Models API](https://apis.io/apis/anthropic/anthropic-models-api/)
- [Anthropic Message Batches API](https://apis.io/apis/anthropic/anthropic-message-batches-api/)
- [Anthropic Files API](https://apis.io/apis/anthropic/anthropic-files-api/)
- [Anthropic Skills API](https://apis.io/apis/anthropic/anthropic-skills-api/)
- [Anthropic Claude Code Analytics API](https://apis.io/apis/anthropic/anthropic-claude-code-analytics-api/)
- [Anthropic Agents API](https://apis.io/apis/anthropic/anthropic-agents-api/)
- [Anthropic Api Keys API](https://apis.io/apis/anthropic/anthropic-api-keys-api/)
- [Anthropic Cost API](https://apis.io/apis/anthropic/anthropic-cost-api/)
- [Anthropic Environments API](https://apis.io/apis/anthropic/anthropic-environments-api/)
- [Anthropic Events API](https://apis.io/apis/anthropic/anthropic-events-api/)
- [Anthropic Organization API](https://apis.io/apis/anthropic/anthropic-organization-api/)

## Tags

Artificial Intelligence, Counting, Tokens

---

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