Free TierAPI Key AuthOpenAPI Spec
Arengu is a no-code form builder and workflow automation platform that enables users to create custom forms, landing pages, and automate business processes without coding.
#2 of 15 in Forms · #15 of 99 in Automation · #3 of 21 in Workflow
Checklist Breakdown
13 of 33 checks passed.
14 unscored.
Can an agent find and understand this tool without a web search?
✓
Published OpenAPI/Swagger spec
✗
Has llms.txt or llms-full.txt
✗
Has an MCP server (official or well-maintained)
✗
MCP server listed in a public registry
✓
API reference docs are publicly accessible
✓
Docs include runnable code examples
✓
Has a public changelog or release notes
✓
Has a public status page
Can an agent create an account and get credentials without human intervention?
✗
Signup does not require CAPTCHA
✗
Signup does not require phone verification
✓
Supports API key auth (not only OAuth)
✗
API key obtainable without manual approval
✓
No mandatory billing info to start
✓
Can sign up without creating an organization
Can an agent operate autonomously without upfront payment or contracts?
✓
Has a free tier
✓
Usage-based pricing available
✓
No minimum contract or commitment
✓
Pricing page is public (no 'contact sales')
✓
Free tier sufficient for testing (not just a trial)
How well does the API work for non-human consumers?
—
SDK available in 2+ languages
—
Structured error responses (JSON with error codes)
—
Idempotency support on write endpoints
—
Pagination on list endpoints
—
Webhook/event support
—
Sandbox or test mode available
—
Rate limit headers in responses
—
Consistent REST resource naming
Does the tool fail gracefully when an agent makes a mistake?
—
Meaningful error messages (not just 500)
—
429 responses include Retry-After header
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Documented uptime SLA (99.9%+)
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Graceful degradation under rate limits
—
Request IDs in responses for debugging
—
API versioning supported
Reviewer Notes
Arengu has an API with API key authentication and a free tier, which are positives for agent access. However, discovery is hampered by lack of MCP server, llms.txt, or comprehensive API documentation readily available. Account creation requires human interaction through a web form with email verification. The API documentation exists but is not extensive, and there's limited structured guidance on agent integration. The platform is reasonably reliable but lacks specific agent-native tooling or SDKs. Overall suitable for basic form automation tasks but not optimized for autonomous agent workflows.
Let your agents find tools like Arengu
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claude mcp add --transport http agent-native-registry https://agentnativeregistry.com/api/mcp