---
title: X
description: The API documented some check signals as true/false but returned 1 or 0, so a strict comparison in your script could quietly never match. smtp_tls_supported…
canonical: https://watchfor.io/changelog/2026-10-04-api-check-signals-boolean
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[All updates](/changelog#2026-10-04-api-check-signals-boolean) 🐛 Fixed Oct 4, 2026 · v 9.3.8

# API check results return yes/no signals as true or false

The API documented some check signals as true/false but returned 1 or 0, so a strict comparison in your script could quietly never match. smtp_tls_supported, smtp_open_relay, smtp_ptr_valid, tcp_match and sitemap_found in GET /v1/monitors/{id}/checks and the check detail now come back as real booleans, as the OpenAPI spec and SDK types always said. If you compared them with 1, compare with true instead.

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Canonical page: https://watchfor.io/changelog/2026-10-04-api-check-signals-boolean · Site guide: https://watchfor.io/llms.txt