Automatic API Attack Tool

At a glance

• Editor score
  6.5 / 10
• Pricing
  Open source
• Best for
  Simple free Swagger API fuzzing
• Paid from
  Free
• Authorization testing
  Yes
• Facts checked
  20 Sep 2026

• Where it wins

  • Free, open-source command-line API testing
  • Positive, negative, and endpoint fuzzing checks
  • Proxy support and CI/CD-oriented execution

• Where it doesn't

  • Supports Swagger 2.0 rather than broader API formats
  • No API discovery capability
  • No integrations or verified business-logic testing

Our verdict on Automatic API Attack Tool

Automatic API Attack Tool is a free, open-source command-line tool from Imperva for developers and organizations testing APIs defined by Swagger 2.0 specifications. It accepts JSON or YAML specifications, generates valid and invalid parameter values, sends requests to a target host, and checks responses against the API definition. Windows and Linux support, self-hosted deployment, and command-line execution make it suited to teams that want repeatable API checks in development or CI/CD workflows.

Its strongest area is focused request validation. Positive checks exercise generated valid parameters, while negative checks inject generated invalid values. Endpoint fuzzing targets parameters defined in the specification, and response-code validation identifies behavior that differs from the API contract. Proxy support extends testing to protected API paths. The tool can also generate TestNG results and bad-request output, which gives teams structured artifacts for review or pipeline handling. Authorization testing and input validation testing are included in its category coverage.

The trade-off is narrow scope. API discovery is not included, and the tool is centered on Swagger 2.0 rather than a wider range of API description formats. It also does not provide integrations or verified business-logic testing, so teams seeking broader security testing or ecosystem connectivity should choose a more expansive alternative. Automatic API Attack Tool is a practical fit for developers and security teams with defined Swagger APIs who need free, repeatable fuzzing and contract-oriented checks. It is less suitable for organizations starting without API specifications or looking for discovery-led, multi-format, business-logic, or integrated testing.

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Automatic API Attack Tool pricing

Automatic API Attack Tool fact sheet

Alternatives to Automatic API Attack Tool

• Levo.aiA full-lifecycle API security platform spanning discovery, testing, and runtime monitoring.9.4
• PyntBroad API security coverage with flexible integrations and a free entry plan.9.3
• Akto API Security PlatformA broad API security platform with a free plan and hybrid deployment options.9.2

See all Automatic API Attack Tool alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update