MailShrine

3,000 emails / month

Developer APIEmail that ships inside your product.

One shared MailShrine login. Open the Developer API dashboard to manage keys, domains, webhooks, and SMTP — REST, SDKs, CLI, and more. 3,000 free emails every month on Sandbox (soft 300/day). Paid packs never expire — 1 credit = 1 send. USD + NGN.

mailshrine · beta
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See how to connect

Why Developer API

Send email from your product on the same MailShrine account

Not a separate ESP login — keys, domains, SMTP, webhooks, templates, and Stella live next to Email Marketing, Business Email, and Lead Generator. 1 credit = 1 accepted send. Sandbox gives you free monthly emails; paid packs never expire. Ship with REST or SMTP, listen to eight delivery events, and wire Zapier/Make when you are not writing backend code yet.

REST + SMTP

HTTP send for new apps; relay for tools that already speak mail.

Eight events

Delivered through failed — signed webhooks your backend can trust.

Six SDKs + CLI

Node, TypeScript, Python, Go, Ruby, PHP — plus terminal checks.

Stella inside

Ask how to ship a path; approve before she creates keys or hooks.

Connect your stack

3,000 emails / month

Developer API

3,000 free emails every month on Sandbox (soft 300/day). Paid packs never expire — 1 credit = 1 send. USD + NGN. Send email from your product on the same MailShrine account. REST, SDKs, CLI, webhooks, SMTP, Shopify and no-code — plus Stella, the in-product AI that answers from our docs and can create keys or webhooks after you approve.

Stella

In-product AI

Meet Stella

Not a generic chatbot — Stella is your MailShrine build partner. Ask how to ship a send path; get steps, snippets, and safe actions you confirm before they run.

Product-trained

Answers from MailShrine DevAPI knowledge — keys, domains, SMTP, webhooks.

Can take action

Proposes creating keys & webhooks. You approve — then it runs.

Role-aware

Viewers stay read-only. Chat never burns your send credits.

See how she works →
Stella · live product
confirm before write
Ask Stella in the MailShrine Developer API dashboard

01

REST API

Send, templates, and events over HTTPS — any language that can call an API with a Bearer key.

02

Official SDKs

Node, TypeScript, Python, PHP, Go, and Ruby samples so you can ship without wiring every request by hand.

03

CLI

Login with your API key, send a test, and check usage from the terminal or CI.

04

Webhooks

Push delivered, bounce, complaint, open, and click events into your product with signed payloads.

05

SMTP relay

Point existing apps at MailShrine when you already speak classic mail protocols.

06

No-code & apps

Zapier, Make, n8n, Shopify, and more — connect without rebuilding your stack.

POST

api/v1/emails/send

live · open beta

// Authorization: Bearer ms_live_…POST /api/v1/emails/send{  "to": "user@acme.com",
  "from": "orders@yourdomain.com",
  "subject": "Welcome aboard"
}

SDK languages

Node.jsPythonPHPGoRubyTypeScript

Platforms & tools

ShopifyWooCommerceWordPressHubSpotZapierMaken8nStripe

01 — Security

API keys with scopes you control

Create keys in the dashboard, copy the secret once, and lock each key to the scopes your app needs — send, templates, webhooks, domains, or relay. Rotate or revoke without redeploying the whole product.

  • ✓Secrets shown once at creation — prefixes only after that
  • ✓Scopes: send.email, templates, webhooks.manage, domains.manage, relay.read
  • ✓Audit trail when keys are created, rotated, or revoked

Dashboard → API Keys

mailshrine · developer-api
MailShrine Developer API Keys screen with scoped keys

02 — Deliverability

Domain Auth that protects inbox placement

Add your sending domain, publish SPF, DKIM, and DMARC, then verify in one place. From addresses must use a verified domain — the same discipline production email teams expect.

  • ✓Clear DNS records to copy into your registrar
  • ✓Verify status in the dashboard before first send
  • ✓Works with the suite reputation story, not a separate silo

Dashboard → Domain Auth

mailshrine · developer-api
Domain Authentication with verified and pending domains

03 — Send

REST send that costs one credit per accepted email

POST /emails/send with a Bearer key. Subject and text/html or a templateId with merge data. Sandbox soft-caps protect free usage; paid packs never expire. Try the same call live in the Playground.

  • ✓1 credit = 1 accepted send
  • ✓Templates with {{merge}} fields
  • ✓Same wallet model as the rest of MailShrine

Docs · Playground · SDKs

mailshrine · developer-api
Integration Guide with REST send curl example

04 — SMTP

SMTP relay for apps that already speak mail

Point WordPress, legacy CRMs, or internal tools at MailShrine relay credentials. Host, port, username, and password live on the SMTP Relay page — rotate passwords when you need to.

  • ✓TLS on 587 (SSL alternate 465)
  • ✓Username and password assigned by MailShrine
  • ✓No need to rewrite every SMTP client overnight

Dashboard → SMTP Relay

mailshrine · developer-api
SMTP Relay connection settings with demo credentials

05 — Events

Signed webhooks for delivery truth

Register an HTTPS URL and choose which delivery events you care about. MailShrine signs every payload so your backend can trust opens, clicks, bounces, and failures.

  • ✓HMAC signature on the raw JSON body
  • ✓Ping / live status for each endpoint
  • ✓Eight event types — pick defaults or select all

Dashboard → Webhooks

mailshrine · developer-api
Webhooks endpoints list with delivery event tags

Listen to every signal

8 delivery events

Choose defaults (Delivered, Bounced, Opened) or select all — each payload is HMAC-signed.

Signed webhooks

01

Delivered

email.delivered

Reached the mailbox provider

02

Bounced

email.bounced

Address rejected or undeliverable

03

Complained

email.complained

Marked as spam

04

Opened

email.opened

Recipient opened the email

05

Clicked

email.clicked

Link in the email was clicked

06

Rejected

email.rejected

Blocked before send

07

Delayed

email.delayed

Temporary delivery delay

08

Failed

email.failed

Send or rendering failed

06 — No-code

Zapier, Make, n8n, and more — without a backend rewrite

Connect the apps your ops team already runs. Send transactional mail and react to delivery events across Zapier, Make, n8n, Webflow, WordPress, and Shopify.

  • ✓Zapier & Make connected flows
  • ✓WordPress plugin and Shopify paths
  • ✓Same API key scopes as your custom code

Dashboard → No-Code Apps

mailshrine · developer-api
No-Code Apps integrations grid for MailShrine Developer API

Zapier

Send email and react to delivery events across 5,000+ apps.

Make.com

Visual scenarios — HTTP send + webhook catch.

n8n

Open-source automation with HTTP Request nodes.

Webflow

Form submissions → confirmation emails.

WordPress

Contact forms and wp_mail through MailShrine.

Shopify

Order confirmations via Flow or custom apps.

07 — Playground

Call live REST endpoints before you ship

Pick an endpoint, edit the JSON, and send with your suite session or an API key. Inspect the real response — stats, templates, single send, or bulk.

  • ✓GET /v1/stats, templates, POST send & bulk
  • ✓Suite session or API key auth
  • ✓Reset sample payloads in one click

Dashboard → API Playground

mailshrine · developer-api
API Playground with live REST endpoints

08 — SDKs

SDKs for the languages you already ship

Open-source, strongly typed clients for Node.js, TypeScript, Python, Go, Ruby, and PHP — plus a CLI for quick terminal checks.

  • ✓Node.js · TypeScript · Python · Go · Ruby · PHP
  • ✓Install from the suite repo; works on your computer
  • ✓CLI: install, login, send test, check usage

Dashboard → SDK Libraries

mailshrine · developer-api
SDK Libraries page with Node TypeScript Python Go Ruby PHP
Node.js
TypeScript
Python
Go
Ruby
PHP
mailshrine · cli
MailShrine CLI reference — install, login, send test

09 — Templates

Save subject and body once — send with templateId

Author {{merge}} templates in the dashboard, then send with templateId and data from your app. Marketing, ecommerce, and transactional shapes in one place.

  • ✓{{variables}} in subject and body
  • ✓Reuse across REST and bulk send
  • ✓Search and manage from Intelligence → Templates

Dashboard → Templates

mailshrine · developer-api
Templates grid with merge variables

10 — Stella

Stella — your in-product developer partner

Ask Stella how to achieve a goal on MailShrine. She answers from product knowledge, proposes step-by-step plans, and can create keys or webhooks only after you approve — viewers stay read-only.

  • ✓Grounded in Developer API docs and flows
  • ✓Confirm-before-write for mutating actions
  • ✓Does not spend email send credits to chat

Dashboard → Stella

mailshrine · developer-api
Ask Stella AI assistant in the Developer API dashboard

Pricing

Same packs as the dashboard

Sandbox refills monthly. Paid packs never expire. 1 credit = 1 accepted send — USD and Naira on the same cards you see after login.

Start free

Sandbox

$0forever

3,000 credits/month

≈ 3,000 emails

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    3,000 emails every month
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    Soft cap 300 emails/day
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    Unlimited domains
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    API + SMTP relay
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    Refills every month
Get 3,000 free/month
On Sale

Relay

$12.77$11.50
10% off

50,000 credits

≈ 50,000 emails

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    50,000 emails
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    $2.30 / 10k
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    Credits never expire
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    Unlimited domains
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    API + SMTP relay
Buy Plan

Dispatch

$26.91$23
15% off

100,000 credits

≈ 100,000 emails

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    100,000 emails
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    $2.30 / 10k
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    Credits never expire
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    Unlimited domains
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    Priority support
Buy Plan

Signal

$71.88$57.50
20% off

250,000 credits

≈ 250,000 emails

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    250,000 emails
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    $2.30 / 10k
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    Credits never expire
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    Unlimited domains
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    Priority support
Buy Plan

Cascade

$152.95$115
25% off

500,000 credits

≈ 500,000 emails

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    500,000 emails
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    $2.30 / 10k
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    Credits never expire
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    Unlimited domains
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    Priority support
Buy Plan

Orbit

$305.90$230
25% off

1,000,000 credits

≈ 1,000,000 emails

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    1,000,000 emails
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    $2.30 / 10k
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    Credits never expire
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    Unlimited domains
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    Priority support
Buy Plan
Full pricing page →

16 — Price comparison · USD

Where MailShrine sits on send price

49+ email APIs and ESPs. Pick a volume. We rank the lowest published per-email first. MailShrine is pay-as-you-go only — no monthly send plan — at a flat $2.30 / 10k, and paid packs never expire. Educational estimates, not live quotes.

UsAt 50,000 emails, MailShrine is #1 in this list — Relay · ~$11.50 for 50,000 · $0.230 / 1k. Sandbox is 3,000 emails every month · soft 300/day.

50 of 50 companies

Price table · 50,000 emails

CompanyPricingPrice at this sizeFree allowance
MailShrineUsPay as you goRelay · ~$11.50 for 50,000 · $0.230 / 1kSandbox · 3,000 emails every month · soft 300/day
Scaleway TEMPay as you go~$12.50 · $0.250 / 1kLimited free tier
Yandex PostboxPay as you go~$15.00 · $0.300 / 1kLimited free
Selectel Cloud EmailPay as you go~$20.00 · $0.400 / 1kTrial
Elastic EmailPay as you go~$40.00 · $0.800 / 1kLimited free
ZeptoMailPay as you go~$45.00 · $0.900 / 1kFree credits on signup
Netcore Email APIPay as you go~$47.50 · $0.950 / 1kTrial
SMTP2GOPay as you go~$50.00 · $1.00 / 1k1,000 emails/mo free
Unisender GoPay as you go~$50.00 · $1.00 / 1kTrial
SMTP.comPay as you go~$55.00 · $1.10 / 1kTrial
EmailitPay as you go~$60.00 · $1.20 / 1kFree tier
MailjetPay as you go~$60.00 · $1.20 / 1k200 emails/day free plan
SocketLabsPay as you go~$60.00 · $1.20 / 1kTrial credits
useSendPay as you go~$60.00 · $1.20 / 1kSelf-host free
PostmarkPay as you go~$62.50 · $1.25 / 1k100 emails/mo trial-style
BrevoPay as you go~$70.00 · $1.40 / 1k300 emails/day free
MailgunPay as you go~$70.00 · $1.40 / 1kTrial credits
Mailgun EUPay as you go~$70.00 · $1.40 / 1kTrial
Mailtrap Email APIPay as you go~$70.00 · $1.40 / 1kSandbox free; sending has free tier
Brevo SMS+EmailPay as you go~$75.00 · $1.50 / 1kShared Brevo free
GreenArrowPay as you go~$75.00 · $1.50 / 1kDemo
MailerSendPay as you go~$75.00 · $1.50 / 1k3,000 emails/mo free
SparkPostPay as you go~$75.00 · $1.50 / 1kTrial / starter
MailpacePay as you go~$80.00 · $1.60 / 1kTrial
ResendPay as you go~$80.00 · $1.60 / 1k3,000 emails/mo free
SendGridPay as you go~$80.00 · $1.60 / 1k100 emails/day free forever
Mailchimp TransactionalPay as you go~$90.00 · $1.80 / 1kTied to Mailchimp plans
LoopsPay as you go~$100 · $2.00 / 1k1,000 emails/mo free
OneSignal EmailPay as you go~$100 · $2.00 / 1kFree messaging tier (limits apply)
PlunkPay as you go~$100 · $2.00 / 1kFree tier
Campaign MonitorPay as you go~$125 · $2.50 / 1kTrial
InfobipPay as you go~$125 · $2.50 / 1kTrial
Sinch EmailPay as you go~$125 · $2.50 / 1kTrial
ButtondownPay as you go~$175 · $3.50 / 1kFree tier
MoosendPay as you go~$175 · $3.50 / 1kTrial
Vonage MessagesPay as you go~$175 · $3.50 / 1kTrial credit
GetResponsePay as you go~$200 · $4.00 / 1kTrial
MailchimpPay as you go~$200 · $4.00 / 1kFree plan (tight limits)
OmnisendPay as you go~$200 · $4.00 / 1kFree plan
ActiveCampaignPay as you go~$225 · $4.50 / 1kTrial
Kit (ConvertKit)Pay as you go~$225 · $4.50 / 1kFree up to subscriber limit
CourierPay as you go~$250 · $5.00 / 1kFree developer tier
DripPay as you go~$250 · $5.00 / 1kTrial
KlaviyoPay as you go~$250 · $5.00 / 1kFree plan up to profile limits
KnockPay as you go~$250 · $5.00 / 1kFree developer tier
Customer.ioPay as you go~$300 · $6.00 / 1kTrial
HubSpot TransactionalPay as you go~$400 · $8.00 / 1kMarketing Hub free has limits
Adobe CampaignPay as you go~$750 · $15.00 / 1kSales-led
Oracle EloquaPay as you go~$750 · $15.00 / 1kSales-led
Salesforce Marketing CloudPay as you go~$750 · $15.00 / 1kSales-led
See MailShrine packsJump to feature comparison →

17 — Feature comparison · Oct 2026

28 email APIs, on the jobs developers actually need

Filter by capability, or expand a card. MailShrine stays highlighted. Marks cover PAYG credits, never-expire packs, Sandbox, REST, SMTP, SDKs, CLI, signed webhooks, Domain Auth, templates, suite login, NGN billing, and Stella.

28 of 28 companies

Feature matrix

CompanyPAYGNo expirySandboxRESTSMTPSDKsCLIWebhooksDomainsTemplatesSuiteNGNAI
MailShrineUs
ZeptoMail
Elastic Email
Netcore Email API
Postmark
SendGrid
Unisender Go
Brevo
MailerSend
Mailgun
Mailjet
Mailtrap
Plunk
Resend
SocketLabs
Infobip
SparkPost
Loops
Mailchimp Transactional
Scaleway TEM
SMTP2GO
Klaviyo
OneSignal
ActiveCampaign
Courier
Customer.io
HubSpot
Knock

Developer API Guides

Learn the path, not the jargon.

All guides →

Developer API Tools

Playground, webhooks, DNS, SMTP.

All tools →

API Playground

Try send and inspect responses from the browser with your suite session.

Webhook tester

Understand payload shapes for opens, clicks, bounces, and complaints.

DNS checker

Validate SPF, DKIM, and DMARC records for your sending domain.

SMTP connection doctor

Confirm relay host, TLS, and credentials before production traffic.

Ready to send from your product?

Sign in with your MailShrine account to open the Developer API dashboard — same login as the rest of the suite.

View pricing