Anthropic-compatible token counting (POST /v1/messages/count_tokens).

Claude Code and the Anthropic SDKs call this before sending requests. Required scope: write

POST /v1/messages/count_tokens

cURL

curl --request POST \
  --url 'https://api.nsr.stateset.com/v1/messages/count_tokens' \
  --header "X-API-Key: $STATESET_NSR_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{}'

200

{
  "input_tokens": 1
}

Claude Code and the Anthropic SDKs call this before sending requests.

Required scope: write

Request body

JSON body of type any.

Response

CountTokensResponse

input_tokens · integer (int32) · required

Status codes

Code	Meaning
200	Estimated input token count
401	Unauthorized — missing or invalid credentials
403	Forbidden — the key/token lacks the required scope
429	Rate limited — see Retry-After / X-RateLimit-Reset

cURL

curl --request POST \
  --url 'https://api.nsr.stateset.com/v1/messages/count_tokens' \
  --header "X-API-Key: $STATESET_NSR_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{}'

200

{
  "input_tokens": 1
}