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POST
/
v1
/
messages
/
count_tokens
curl https://api.arouter.ai/v1/messages/count_tokens \
  -H "X-Api-Key: lr_live_xxxx" \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Documentation Index

Fetch the complete documentation index at: https://docs.arouter.ai/llms.txt

Use this file to discover all available pages before exploring further.

curl https://api.arouter.ai/v1/messages/count_tokens \
  -H "X-Api-Key: lr_live_xxxx" \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "claude-sonnet-4-20250514",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'