Stigg

Fair

Agent Native Score

Free TierAPI Key AuthOpenAPI Spec

Stigg is a billing and pricing infrastructure platform that enables companies to manage subscriptions, entitlements, and usage-based billing with built-in monetization controls.

Categories: Billing · Pricing · Subscriptions

#16 of 26 in Billing · #2 of 2 in Pricing · #2 of 4 in Subscriptions

Checklist Breakdown

13 of 33 checks passed. 14 unscored.

Discovery 63%

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

Auth & Onboarding 50%

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

Pricing 100%

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)

Agent Tooling Not yet scored

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

Reliability Not yet scored

Does the tool fail gracefully when an agent makes a mistake?

— Meaningful error messages (not just 500)

— 429 responses include Retry-After header

— Documented uptime SLA (99.9%+)

— Graceful degradation under rate limits

— Request IDs in responses for debugging

— API versioning supported

Reviewer Notes

Stigg has solid agent-friendly fundamentals: a public REST API with good documentation, API key authentication, and a sandbox environment for testing. The OpenAPI spec is available, which aids discovery. However, account creation requires manual sign-up (no programmatic account creation), and there's no MCP server or llms.txt file to accelerate agent discovery. The API is well-structured for billing operations, but agents would need human intervention to get started. The free tier and sandbox support autonomous operation once authenticated, making it moderately agent-native but with friction at the onboarding stage.

Stigg

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