Plunk

Name: Plunk — Agent-Ready Pricing Assessment
Brand: Plunk

Agent-Ready Verified

Agent-Ready SaaS Index · useplunk.com · scored 2026-05-09 · rubric v2.0

Score 83 / 100

Email Marketing

Free tier

Self-serve checkout

Plunk scores 83/100 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.

See Plunk pricing summary Live pricing page

Pricing

Plunk pricing

As of 2026-05-09 · www.useplunk.com

Pay-as-you-go API

Sign up, get an API key, pay per call

Self-serve checkout with public pricing — an autonomous agent can complete the purchase without a sales call.

Signup: email

Instant use

Free tier

Per-model pricing

1 SKU priced per email

Model / SKU	Input	Output
Email send Pay per email sent	$0.001 / email	—

Score breakdown · rubric v2.0

How Plunk scores on the agent-ready dimensions

Public pricing visibility

15 / 15

Self-serve checkout

15 / 15

Public API + docs

14 / 20

Usage-based / metered pricing

20 / 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

83 / 100

Effective pricing

What it actually costs at typical scale

1,000 emails sent

$1/mo

· 1000 emails sent· no other fees

Confidence: high

Agent purchase verdict

Can an autonomous agent transact here?

Agent-ready

LLM score: 95/100

Can create account

Yes

Can enter payment method

Yes

Can upgrade plan

Can buy more usage

Yes

Can cancel online

Yes

Payment methods

card

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

Yes

Security review required

Trial

Available, no card

API readiness

API & developer surface

API-first product

Public API docs

www.useplunk.com/docs

Sandbox present

Webhooks

Yes

MCP mentioned

Enterprise signals

Trust & compliance

Certifications

GDPR

SSO / SAML

Unknown

RBAC

Unknown

Audit logs

Unknown

Data residency

Competitive intel

Positioning & ecosystem

Headline

“The open-source email platform”

Buyer persona

developer

smb

Replaces / compared against

Resend

SendGrid

Mailchimp

Customer.io

Mailgun

Value claims

transparent pricing

no lock‑in

Agent purchase simulation

Six-step check: can an agent actually buy from Plunk?

✓

Discover price

✓

Select a plan

✗

Pay per task

✓

Avoid a sales call

✗

API docs without auth

✗

Estimate cost upfront

Analysis

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.

✓ For an AI agent

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.

◐ Opportunities for the provider

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.

One-line fix

How Plunk could lift its score

Add a per-unit price (e.g. $X / 1K calls) to the pricing page so an agent can compute its own cost before committing.

pricing_visible	true
headline_phrasing	The open-sourceemail platform — Transactional emails, marketing campaigns, and workflow automation — in one platform. Self-hostable, $0.001 per email, no contact limits.
tier_count	2
lowest_paid_entry_usd	null
free_tier	true
free_tier_terms	null
per_unit_price	$0.001 per email
annual_required	false
self_serve_paid_tiers	1
sales_only_tiers	0
public_api_docs_url	null
api_docs_auth_walled	null
ai_pricing_json_present	false
agents_txt_present	false
anonymous_purchase_path	false
per_unit_classification	{"unit_class":"message","confidence":"medium","agent_task_price_forecastable":"yes","rejected_reason":null,"evidence_text":"$0.001 per email"}
usage_headline_present	false
custom_tier_present	true
agent_friendly	{"ai_pricing_json":false,"agents_txt":false,"llms_txt":false,"sitemap_xml":true,"mcp_server_card":false,"agent_skills_index":false,"x402_supported":false}

View raw extracted page text →

Page heading: The open-sourceemail platform

CTAs (40): Plunk · Features · By humans · Pricing · Guides · Docs · Sign in · Get started · Open main menu · Get started free · Read the docs · 001Resendvs Plunk

Price tokens (11): $0.001 per email · $0.001per email · $0.001 / email · $0.001 / email · $0.001 / email · $0.001 / email · $0.001/emailFor the same pla · $0.004 / emailSendGrid · $0.002 / emailMailgun · $0.003 / emailBased on plans m · $0.001 per email on paid

PlunkFeaturesBy humansPricingGuidesDocsSign inGet startedOpen main menuThe open-sourceemail platformTransactional emails, marketing campaigns, and workflow automation — in one platform. Self-hostable, $0.001 per email, no contact limits.Get started freeRead the docs$0.001per email, flat5,000+stars on GitHub∞contacts, always free< 5minto first email sentBuilt into products atOpen Source✦AGPL-3.0✦Self-Hostable✦$0.001 / email✦Unlimited Contacts✦GDPR Compliant✦5,000+ GitHub Stars✦EU Hosted✦Open Source✦AGPL-3.0✦Self-Hostable✦$0.001 / email✦Unlimited Contacts✦GDPR Compliant✦5,000+ GitHub Stars✦EU Hosted✦Open Source✦AGPL-3.0✦Self-Hostable✦$0.001 / email✦Unlimited Contacts✦GDPR Compliant✦5,000+ GitHub Stars✦EU Hosted✦Open Source✦AGPL-3.0✦Self-Hostable✦$0.001 / email✦Unlimited Contacts✦GDPR Compliant✦5,000+ GitHub Stars✦EU Hosted✦§ 02The AlternativesReplace your email stackOne tool in place of Resend, SendGrid, Mailchimp, Customer.io, and Mailgun.001Resendvs Plunk002SendGridvs Plunk003Mailchimpvs Plunk004Customer.iovs Plunk005Mailgunvs Plunk§ 03The ProblemSimple to start. Serious at scale.Easy enough for a side project. Ready for the business it becomes./ Setup< 5 minZero-configuration startMost email platforms take days to configure. Plunk is running in under five minutes — domain, DKIM and first send./ Pricing0 limitsPay per email, never per contactOther platforms charge more as your list grows. Plunk stores unlimited contacts for free and bills only on send./ OwnershipAGPL-3.0No lo…

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Agent-Ready Spec

Plunk

Agent-Ready Verified

83

/ 100 (rubric v2.0)

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