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Messages (v1/messages)
Pass-through endpoint for Anthropic Messages API requests.
Endpoint
http
1POST /v1/messages2Content-Type: application/jsonRequest example
bash
1curl "$UNI_API_BASE_URL/messages?beta=true" \2 -H "Authorization: Bearer $UNI_API_KEY" \3 -H "Content-Type: application/json" \4 -H "anthropic-version: 2023-06-01" \5 -d '{6 "model": "claude-sonnet-4-6",7 "max_tokens": 128,8 "messages": [{"role":"user","content":"Hello"}]9 }'Pass-through behavior
Uni API forwards the request body, compatible headers, and query string upstream, then returns the upstream response body unchanged. The gateway still authenticates your Uni API key and records usage.
Usage accounting
- Claude
input_tokens,cache_creation_input_tokens, andcache_read_input_tokensare counted as input tokens. cache_read_input_tokensare recorded as cached tokens.