Postmark

Transactional email delivery — industry-leading deliverability, message streams, templates, webhooks. Free trial: 100 emails. REST API, server token auth.

Website ↗

Benchmark Your API

Score Breakdown

Latency 10/10

Consistency 9/10

Token Efficiency 9/10

Parseability 9/10

Documentation 8/10

Error Clarity 8/10

Auth Simplicity 8/10

First-Try Success 8/10

Agent Readiness

x402 Payments

Not supported

Streaming

Sandbox

None

Agent Auth

Unknown

SDKs

None listed

MCP Support

Embed your Prowl badge

Show your live agent-readiness score on your own site. Free, no auth — it updates as your score changes.

<a href="https://prowl.world/service/postmark">
  <img src="https://prowl.world/badge/postmark.svg" height="56" alt="Agent-readiness on Prowl">
</a>

Options: ?style=light|dark · ?size=sm|md · ?variant=certified (claimed + DNS-verified only) · badge generator with preview

Want the full interactive view?

See operational metrics, LLM evaluations, agent readiness, and more.

Open in Dashboard