Postmark
Postmark scores 82/100 on xpay's Agent-Ready Index v2: partial pricing visibility; self-serve checkout is available; a public API exists with documentation; usage-based / per-token pricing is published; a free entry path exists.
Postmark pricing
Free
Free
Basic
$15/mo
flatPro
$16.5/mo
flatPlatform
$18/mo
flatHow Postmark scores on the agent-ready dimensions
Public pricing visibility
15 / 15
Self-serve checkout
15 / 15
Public API + docs
20 / 20
Usage-based / metered pricing
13 / 20
Free entry path
7 / 7
No sales call required
7 / 7
Card / wallet / x402 payment
5 / 6
Machine-readable bonus (MCP / OpenAPI)
0 / 10
Total
82 / 100
What it actually costs at typical scale
Free plan, 5,000 emails
$0/mo
Basic plan, 12,000 emails
$18.6/mo
Pro plan, 25,000 emails
$36/mo
Can an autonomous agent transact here?
Can create account
Can enter payment method
Can upgrade plan
Can buy more usage
Can cancel online
Payment methods
Human approval recommended
Pricing transparency
full
Purchase motion
self_serve
Demo required
Quote required
Annual commit required
Auto-renewal mentioned
Cancellation policy visible
Refund policy visible
Invoice payment available
Purchase orders supported
MSA required
DPA available
Security review required
Trial
Available, no card
API & developer surface
API-first product
Sandbox present
Webhooks
MCP mentioned
Trust & compliance
Certifications
SSO / SAML
Unknown
RBAC
Audit logs
Unknown
Positioning & ecosystem
“Simple pricing that scales with your business”
Buyer persona
Six-step check: can an agent actually buy from Postmark?
Discover price
Select a plan
Pay per task
Avoid a sales call
API docs without auth
Estimate cost upfront
Pros and cons for AI agents
Observational summary written by xpay from the signals captured on 2026-05-06. Not a review of the product — only of its current pricing posture for agent buyers.- Pricing is publicly visible on an indexable page — agents can read tiers without scraping past auth.
- Every advertised tier is self-serve; no tier requires scheduling a call.
- A free tier exists, lowering the bar for an agent builder to prototype before committing budget.
- No per-unit price was advertised, so an agent has no way to estimate the cost of a single task.
- API documentation is gated or absent; an agent cannot inspect the integration surface without authentication.
- PPU requires account creation and an issued API key; a fully unauthenticated agent purchase is not yet supported.
- No /.well-known/ai-pricing.json or equivalent machine-readable pricing manifest is published — agents must rely on HTML scraping.
How Postmark could lift its score
Already agent-ready on Tier 1 signals. Publish `/.well-known/ai-pricing.json` to claim the +5 bonus and lock the verified badge.
| pricing_visible | true |
| headline_phrasing | Simple pricing that scales with your business — Already have an account? Log in → |
| tier_count | 7 |
| lowest_paid_entry_usd | 50 |
| free_tier | true |
| free_tier_terms | null |
| per_unit_price | $1.30 / 1,000 Includes |
| annual_required | false |
| self_serve_paid_tiers | 5 |
| sales_only_tiers | 0 |
| public_api_docs_url | https://postmarkapp.com/developer |
| api_docs_auth_walled | false |
| ai_pricing_json_present | false |
| agents_txt_present | false |
| anonymous_purchase_path | false |
| per_unit_classification | {"unit_class":"other","confidence":"medium","agent_task_price_forecastable":"yes","rejected_reason":null,"evidence_text":"$1.30 / 1,000 Includes"} |
| usage_headline_present | false |
| custom_tier_present | true |
| agent_friendly | {"ai_pricing_json":false,"agents_txt":false,"llms_txt":true,"sitemap_xml":true,"mcp_server_card":false,"agent_skills_index":false,"x402_supported":false} |
View raw extracted page text →
Claim this scorecard & lift your score.
Get the breakdown of every signal we measured, the one-line fix, and how your peers in Transactional Email stack up.
Compare the agent-ready picks in Transactional Email.
If you're building or running an AI agent that needs to buy from this category, see who's scoring highest right now.
See agent-ready picksPostmark
82
/ 100 (rubric v2.0)Transactional Email
Simple pricing that scales with your business — Already have an account? Log in →
7 (slider / volume ladder)
Yes
$50/mo
$1.30 / 1,000 Includes
5 / 0
Public
No
Not published
2026-05-09
Tier-based subscription
Postmark pricing starts at $0/mo for the Free plan; paid plans range from $15/mo for Basic to $18/mo for Platform. Billed monthly.
Free plan (Free)
Discovery files and protocols
Side-channel signals — informational, not part of the score. Each protocol is independent; adoption signals the publisher is thinking about agent buyers.ai-pricing.json
agents.txt
llms.txt
sitemap.xml
MCP Server Card
Agent Skills
x402 / MPP
Compare Postmark with peers
Highest-scoring companies in the same category that an AI agent might evaluate as an alternative.Mailgun
87
Amazon SES
85
Mailchimp Transactional Email
85
UniOne
77
AhaSend
77
Zoho ZeptoMail
73
Aritic Mail
73
Sweego
71
Explore the Agent-Ready SaaS Index
25,480+ SaaS scored on agent-buyability — browse by readiness band, category, or jump straight to a pay-per-run tool on xpay.tools.