api-cost-tracker

The client for the Synth Insight Labs API cost tracker. It records what every API call costs to https://api.synthinsightlabs.com without ever breaking the call it measures. Standard library only; macOS and Linux.

from api_cost_tracker import track, track_tokens, log_call

response = client.messages.create(...)          # any provider SDK
track(response, "anthropic", project="my-project", caller="summarizer")

track_tokens("anthropic", "claude-haiku-4-5", 1200, 300, project="my-project")  # raw HTTP calls
log_call("vercel", service="blob", project="my-project")                       # non-AI APIs

• Providers: anthropic, openai, xai, google, openrouter (records OpenRouter's billed usage.cost).
• Batch API calls: pass service="batches" to track() or track_tokens(). The server then prices the row at the provider's batch rate (half price).
• Never raises. A record that can't be sent goes to an offline buffer at ~/.local/share/api_trust_tracker/buffer.db, and each later successful call sends a few buffered rows too. A record that is lost anyway is logged at WARNING.
• Silent in test suites. While a pytest test runs, the client sends, buffers and drains nothing, so faking _post_to_server can't leak rows either way. A test of the real send path sets API_COST_TRACKER_SEND_IN_TESTS=1 and points api_cost_tracker.buffer.BUFFER_DB_PATH at a temporary file. New in 0.2.3.
• Configuration: COST_TRACKER_API_KEY (required by the server) and COST_TRACKER_URL (default https://api.synthinsightlabs.com), from the environment.

Renamed from api-trust-tracker in 0.2.0. That package now only re-exports this one, and the buffer keeps its old directory so both versions share it.