Testnet one-shot SEC 8-K watch for 1–30 days. The callback is operator-owned; notifications do not reach your application. Successful JSON returns watcher_id, status, payer, payment_tx and network. Check status with GET https://digital-micro-arbitrage-v0-staging.joan-rnandez.workers.dev/v0/watch/{watcher_id}. No filing is guaranteed. If payment reconciliation is pending, retain the receipt and check status; do not purchase again.