Skip to content
Back to the index

Free JSON API

postmarkapp.comAPI design, testing & docs

No liveness check has reached it yet; it has been in the index since 9 Oct 2026. How this is checked

Spam Check is a free web interface and JSON API that evaluates email messages using SpamAssassin scoring. It helps developers process spam scores for incoming or outgoing messages without managing their own SpamAssassin installation.

Inferred · not functionally tested

FreeWebAPICloud-managed
Free JSON API preview
Visit postmarkapp.com

Overview

6 features

Purpose: Checking email spam scores without managing or hosting SpamAssassin.

Inferred · not functionally tested

Audience: email developers and web application teams

Inferred · not functionally tested

Functions: data_extraction

Inferred · not functionally tested

Interfaces: API: indicated (inferred, not tested) · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: free · license: Proprietary · platforms: WEB · deployment: browser, api_only, cloud_managed

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: spamcheck.postmarkapp.com. These links do not verify the individual claims.

In the API design, testing & docs space, Free JSON API takes a focused approach. Inferred · not functionally tested: It focuses on checking email spam scores without managing or hosting SpamAssassin. Inferred · not functionally tested: It is built as a B2B product for email developers and web application teams. Basis unknown · not verified: Free JSON API is free to use. Basis unknown · not verified: It runs on the web and API.

It is developed by Postmark. Inferred · not functionally tested: Key capabilities include spam score checking, JSON API, and spamAssassin analysis. Inferred · not functionally tested: Catalogued interfaces include a public API.

Summary written by a language model from the project’s public pages.

Tasks: Inferred · not functionally tested

  • Spam score checking
  • JSON API
  • SpamAssassin analysis
  • Email processing
  • Header analysis
  • Web interface

Topics: Inferred · not functionally tested

Tags
spam-scoringemail-deliverabilityspamassassin-apijson-api

JSON profile · Text profile · Access guide

Built with & integrations

Connectors
API
Runs on
BrowserAPI-onlyCloud-managed

Trust & compliance

Public signals
HTTPSTerms of ServiceFree tier
Legal
Terms of Service

Indexing history

1

What PulseGate has recorded for this listing

  1. Indexed8 Oct · 21:40 UTC
    Spam Check seen via Saashub
    Source: Saashub · Open

Frequently asked questions about Free JSON API

What is Free JSON API?
Inferred · not functionally tested: Free JSON API focuses on checking email spam scores without managing or hosting SpamAssassin. It is catalogued under API design, testing & docs on PulseGate.
Who is Free JSON API for?
Inferred · not functionally tested: Free JSON API is a B2B product built for email developers and web application teams.
Does Free JSON API have a free plan?
Basis unknown · not verified: Yes — Free JSON API is free to use.
What platforms does Free JSON API run on?
Basis unknown · not verified: Free JSON API runs on the web and API.
Is Free JSON API still active?
Unverified. Free JSON API has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What are alternatives to Free JSON API?
Similar projects tracked by PulseGate include ThunderTestM280W3, Apivo, and APICom.ThunderTestM280W3ApivoAPICom
Who develops Free JSON API?
Free JSON API is developed by Postmark.
Does Free JSON API have an API or integrations?
Inferred · not functionally tested: Yes — Free JSON API exposes a public API.

Also in API design, testing & docs

Same category — not a similarity match