Billing and spend events

import { LangWatch } from "langwatch";

const langwatch = new LangWatch({ apiKey: process.env.LANGWATCH_ORG_API_KEY });
const from = Date.parse("2026-07-01T00:00:00Z");
const to = Date.parse("2026-08-01T00:00:00Z");

// Checksums first, one row per key.
for await (const row of langwatch.spendEvents.iterSummaries({ groupBy: "virtual_key", from, to })) {
  compareWithYourLedger(row.key, row.event_count, row.cost.nano_usd);
}

// Item diff only where a checksum disagreed.
for await (const event of langwatch.spendEvents.iterate({ from, to, virtualKeyId: "vk_01HZX..." })) {
  reconcile(event.gateway_request_id, event);
}

import os

import langwatch

langwatch.setup(api_key=os.environ["LANGWATCH_ORG_API_KEY"])
from_ms, to_ms = 1782864000000, 1785542400000  # 2026-07-01 to 2026-08-01 UTC

# Checksums first, one row per key.
for row in langwatch.spend_events.iter_summaries(group_by="virtual_key", from_ms=from_ms, to_ms=to_ms):
    compare_with_your_ledger(row["key"], row["event_count"], row["cost"]["nano_usd"])

# Item diff only where a checksum disagreed.
for event in langwatch.spend_events.iterate(from_ms=from_ms, to_ms=to_ms, virtual_key_id="vk_01HZX..."):
    reconcile(event["gateway_request_id"], event)