Stamp

47
Fair
Agent Native Score

Stamp is an email service that provides temporary, disposable email addresses for testing, privacy, and development purposes. It allows developers to programmatically generate and manage email inboxes without revealing personal email addresses.

Categories: Email · Testing · Privacy
#3 of 34 in Email · #2 of 38 in Testing · #1 of 5 in Privacy
Checklist Breakdown

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Discovery 35%

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 Not yet scored

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 Not yet scored

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 Requires account 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 Requires account 50%

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

Stamp offers a useful service for agent testing workflows with a free tier and API-key authentication, but lacks foundational agent discovery infrastructure—no MCP server, OpenAPI spec, or llms.txt file. Account creation appears to require manual signup through the web interface. The API likely supports basic operations (generate email, check inbox) but documentation quality and error handling specifics are unclear from public materials. Reliability seems reasonable for a niche service, but without formal API documentation or structured spec, agents struggle to self-discover and integrate with confidence.

Top 10 Lists
Top 10 Email → Top 10 Testing →

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