Mailchimp Transactional

Best for: Teams needing broad API coverage out of the box; Cost-sensitive teams - low, transparent entry price

Avoid if: You want to try it free before paying; You have strict compliance requirements

Pricing model

Hybrid (base + usage) [2]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block $20 per block 21 to 40 blocks”

Published pricing

✓ Yes [3]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block $20 per block 21 to 40 blocks”

Free tier

✗ No [4]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block”

Free tier details

New transactional email users can get up to 500 free email sends to their verified domain. Restrictions apply. [5]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block $20 per block 21 to 40 blocks”

Self-serve signup

✓ Yes [6]mailchimp.com/developer/transactional/guides/quick-start/“This guide will give you everything you need to start using the Mailchimp Transactional API to send fast, personalized transactional emails.”mailchimp.com/help/about-api-keys/“API keys allow other apps access to your account without a password. Learn how to locate and generate API keys for your Mailchimp Marketing account.”

Requires sales call

✗ No [7]mailchimp.com/developer/transactional/guides/quick-start/“This guide will give you everything you need to start using the Mailchimp Transactional API to send fast, personalized transactional emails.”

Enterprise plan

✓ Yes [8]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block $20 per block 21 to 40 blocks”trustradius.com/products/mailchimp-transactional-email/reviews“transactional emails using API or SMTP. Categories & Use Cases. Transactional Email. Starting at. $350. per month.”

Minimum commitment

Requires a Mailchimp Standard or Premium plan [9]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block 1 to 20 blocks 1 to 500k emails $20/block $20 per block”mailchimp.com/legal/terms/“Use of Transactional SMS through Mandrill is also subject to the Additional Terms for Transactional Email (formerly Mandrill).”

• Transactional send
• Inbound parsing
• Templates
• Batch send
• Scheduled send
• SMTP relay
• Dedicated IP
• Analytics

Supported actions

allowlists_add, allowlists_list, allowlists_delete, exports_info, exports_list, exports_rejects, exports_allowlist, exports_activity, ips_list, ips_info, ips_provision, ips_start_warmup, ips_cancel_warmup, ips_set_pool, ips_delete, ips_list_pools, ips_pool_info, ips_create_pool, ips_delete_pool, ips_check_custom_dns, ips_set_custom_dns, inbound_domains, inbound_add_domain, inbound_check_domain, inbound_delete_domain, inbound_routes, inbound_add_route, inbound_update_route, inbound_delete_route, inbound_send_raw, messages_send, messages_send_sms, messages_send_template, messages_send_mc_template, messages_search, messages_search_time_series, messages_info, messages_content, messages_parse, messages_send_raw, messages_list_scheduled, messages_cancel_scheduled, messages_reschedule, metadata_list, metadata_add, metadata_update, metadata_delete, rejects_add, rejects_add_sms, rejects_delete, rejects_delete_sms, rejects_list, rejects_list_sms, senders_list, senders_domains, senders_add_domain, senders_delete_domain, senders_check_domain, senders_verify_domain, senders_info, senders_time_series, subaccounts_list, subaccounts_add, subaccounts_info, subaccounts_update, subaccounts_delete, subaccounts_pause, subaccounts_resume, tags_list, tags_delete, tags_info, tags_time_series, tags_all_time_series, templates_add, templates_info, templates_update, templates_delete, templates_list, templates_publish, urls_list, urls_search, urls_time_series, users_info, users_ping, webhooks_list, webhooks_add, webhooks_info, webhooks_update, webhooks_delete [10]mailchimp.com/developer/transactional/api/“Send a new transactional message through Mandrill using a Mailchimp Transactional template. Search messages by date. Search recently sent messages range, tags,”

Input types

JSON, HTTP POST parameters [11]mailchimp.com/developer/transactional/api/

Output types

JSON, XML, YAML, PHP [12]mailchimp.com/developer/transactional/api/“Send a new transactional message through Mandrill using a Mailchimp Transactional template.”mailchimp.com/developer/transactional/docs/fundamentals/“Mailchimp Transactional has a test mode that lets you experiment and refine”

Webhooks

✓ Yes [13]mailchimp.com/developer/transactional/api/

Sandbox / test mode

✓ Yes [14]mailchimp.com/developer/transactional/docs/fundamentals/“Mailchimp Transactional has a test mode that lets you experiment and refine”

SDK languages

Node.js, Python, PHP, Ruby [15]mailchimp.com/developer/tools/“Mailchimp's API client libraries and mobile SDKs make it easy to work with the Mailchimp Marketing and Transactional APIs with your language or platform”

MCP server

✗ No [16]mcp.pipedream.com/app/mailchimp“Use Pipedream's MCP server to connect your Mailchimp account to AI tools like Cursor, Claude, and Windsurf.”apify.com/engaging_image/mailchimp-mcp-server“The most comprehensive Mailchimp MCP Server built on the Model Context Protocol (MCP), giving your AI assistant full control over your Mailchimp account.”github.com/mattcoatsworth/mailchip-mcp-server“A Model Context Protocol (MCP) server for interacting with the Mailchimp API. Tools for managing campaigns, lists, templates, reports, and automations”

SOC 2

Unknown [17]intuit.com/compliance/“Learn about Intuit's commitment to security through PCI DSS, SOC 2, ISO 27001, and VPAT compliance.”compliance-portal.app.intuit.com“These certifications run for 3 years (renewal audits) and have annual touch point audits (surveillance audits).”rankiteo.com/company/intuitmailchimp/compare/taxact“Neither Intuit Mailchimp nor TaxAct holds SOC 2 Type 2 certification”

HIPAA

✗ No [18]hipaajournal.com/mandrill-hipaa-compliant/“Mandrill is not HIPAA compliant and cannot be used by HIPAA covered entities or business associates to send transactional emails that contain Protected Health”paubox.com/blog/mandrill-hipaa-compliance“No, based on our research, Mailchimp Transactional Email is not HIPAA compliant.”mailchimp.com/resources/hipaa-compliant-email/“Learn about HIPAA email requirements and how you can ensure your business is protecting personal health information while complying with HIPAA regulations.”

GDPR

✓ Yes [19]mailchimp.com/gdpr/“Our guide walks you through information about the GDPR, what steps Mailchimp takes towards complying, how we keep your data safe, and how we lawfully access”

ISO 27001

✓ Yes [20]intuit.com/compliance/“Learn about Intuit's commitment to security through PCI DSS, SOC 2, ISO 27001, and VPAT compliance. Download our certifications and attestations.”compliance-portal.app.intuit.com“These certifications run for 3 years (renewal audits) and have annual touch point audits (surveillance audits).”

PCI DSS

– Unknown [21]mailchimp.com/about/security/“Mailchimp's credit card processing vendor uses security measures to protect your information both during the transaction”intuit.com/compliance/“Learn about Intuit's commitment to security through PCI DSS, SOC 2, ISO 27001, and VPAT compliance.”

Published SLA

✗ No [22]mailchimp.com/resources/service-level-agreement/“A service-level agreement (SLA) is a type of contract that outlines the level of service expected between a service provider and customers.”mailgun.com/resources/comparisons/mailchimp-alternatives/“Mailgun offers a Speed to Delivery SLA that is financially guaranteed and 99.99% Uptime SLA included for every sender, no matter the size.”

Rate limits

20 searches per minute for messages/search endpoint; hourly sending quota exists but specific limit is not documented [23]mailchimp.com/developer/release-notes/message-search-rate-limit-now-enforced/“If you exceed the limit of 20 searches per minute, we'll now return a 429 Too Many Requests response code.”

Known restrictions

Essentials plan is not eligible for Transactional Email, Unused emails in a block don't roll over month to month, Contact lists cannot be uploaded or stored in Mailchimp Transactional, All API calls must use HTTP POST [24]mailchimp.com/pricing/transactional-email/“Each block is a credit for 25,000 emails Total Blocks Emails per Month Price Per Block”mailchimp.com/developer/transactional/api/

• Docs
• API reference
• llms.txt
• Changelog
• Status page

Docs rendering: static

API style

rest

Base URL

https://mandrillapp.com/api/1.0/

Version

1.0

Versioning

url

Stability

ga

Auth methods

api_key

Error format

vendor-specific

Webhook signing

hmac_sha1

SDKs

• Node.js @mailchimp/mailchimp_transactional · repo · updated 2026-03 · 52★
• Python mailchimp-transactional · repo · updated 2026-03 · 49★
• PHP mailchimp/transactional · repo · updated 2026-03 · 51★
• Ruby MailchimpTransactional · repo · updated 2026-03 · 22★

• Auth docs
• Quickstart
• MCP server
• Webhook events

Launched

2012-01-01

• Mailgun

  Mailgun is the all-in-one, intelligent email delivery platform trusted by businesses and loved by developers.

  Hybrid · free tier · public pricing · self-serve

• Mailjet

  The best email marketing software that's built for devs and loved by marketers.

  Hybrid · free tier · public pricing · self-serve

• Amazon Simple Email Service

  Amazon Simple Email Service (Amazon SES) is a cloud-based email service provider that can integrate into any application for high-volume email automation.

  Usage · public pricing · self-serve

• Brevo

  Brevo is the most intuitive all-in-one customer engagement platform: email and SMS marketing, automation, CRM, live chat, and transactional email.

  Hybrid · free tier · public pricing · self-serve

• SendGrid

  Email at scale, proven deliverability, and so much more

  Hybrid · public pricing · self-serve

• MailerSend

  MailerSend is a powerful transactional email system built for developers but designed so non-tech teams can contribute without coding.

  Hybrid · free tier · public pricing · self-serve

Mailchimp Transactional alternatives · Mailchimp Transactional vs Mailgun · All Email APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: mailchimp.com
2. ↑Pricing model: mailchimp.com
3. ↑Published pricing: mailchimp.com
4. ↑Free tier: mailchimp.com
5. ↑Free tier details: mailchimp.com
6. ↑Self-serve signup: mailchimp.com · mailchimp.com
7. ↑Requires sales call: mailchimp.com
8. ↑Enterprise plan: mailchimp.com · trustradius.com
9. ↑Minimum commitment: mailchimp.com · mailchimp.com
10. ↑Supported actions: mailchimp.com
11. ↑Input types: mailchimp.com
12. ↑Output types: mailchimp.com · mailchimp.com
13. ↑Webhooks: mailchimp.com
14. ↑Sandbox: mailchimp.com
15. ↑SDK languages: mailchimp.com
16. ↑MCP server: mcp.pipedream.com · apify.com · github.com
17. ↑SOC 2: intuit.com · compliance-portal.app.intuit.com · rankiteo.com
18. ↑HIPAA: hipaajournal.com · paubox.com · mailchimp.com
19. ↑GDPR: mailchimp.com
20. ↑ISO 27001: intuit.com · compliance-portal.app.intuit.com
21. ↑PCI DSS: mailchimp.com · intuit.com
22. ↑Published SLA: mailchimp.com · mailgun.com
23. ↑Rate limits: mailchimp.com
24. ↑Known restrictions: mailchimp.com · mailchimp.com

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-15 Score Agent Friendliness: 35 → 30
2. 2026-06-15 Score Docs Quality: 35 → 45
3. 2026-06-15 Best For: AI agents and automation - an agent-ready surface (MCP / llms.txt), Teams needi… → Teams needing broad API coverage out of the box, Cost-sensitive teams - low, tr…
4. 2026-06-15 Changelog URL: https://mailchimp.com/whats-new → https://developer.mailchimp.com/changelog
5. 2026-06-15 Llms Txt Present: Yes → No
6. 2026-06-15 Has Structured Data: (none) → Yes
7. 2026-06-15 API Reference URL: (none) → https://developer.mailchimp.com/developer/marketing/api/
8. 2026-06-10 Vendor Description: Send targeted and event-driven messages to anyone, fast—with best-in-class deli… → Send targeted and event-driven messages to anyone, fast - with best-in-class de…
9. 2026-06-09 Scoring Methodology: Scores are computed deterministically from this profile's published, sourced fi… → Scores are computed deterministically from this profile's published, sourced fi…
10. 2026-06-09 Best For: AI agents and automation — an agent-ready surface (MCP / llms.txt), Teams needi… → AI agents and automation - an agent-ready surface (MCP / llms.txt), Teams needi…
11. 2026-06-09 Best For: (none) → AI agents and automation — an agent-ready surface (MCP / llms.txt), Teams needi…
12. 2026-06-09 Avoid If: (none) → You want to try it free before paying, You have strict compliance requirements
13. 2026-06-09 Score Agent Friendliness: (none) → 35
14. 2026-06-09 Score Pricing Transparency: (none) → 85
15. 2026-06-09 Score Setup Speed: (none) → 75
16. 2026-06-09 Score Procurement Friction: (none) → 85
17. 2026-06-09 Score Docs Quality: (none) → 35
18. 2026-06-09 Score Trust Readiness: (none) → 30
19. 2026-06-09 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
20. 2026-06-08 Changelog URL: (none) → https://mailchimp.com/whats-new
21. 2026-06-08 Status Page URL: (none) → https://status.mailchimp.com
22. 2026-06-08 Docs URL: (none) → https://developer.mailchimp.com
23. 2026-06-08 Llms Txt URL: (none) → https://mailchimp.com/llms.txt
24. 2026-06-08 Rendering: (none) → static
25. 2026-06-08 Llms Txt Present: (none) → Yes
26. 2026-06-07 Summary Md: (none) → Mandrill is Mailchimp's transactional email add-on for targeted, event-driven m…
27. 2026-06-07 SDK Packages: Node.js, Python, PHP, Ruby → Node.js, Python, PHP, Ruby
28. 2026-06-07 Free Tier Limit: (none) → 500 emails
29. 2026-06-07 Auth Methods: (none) → api_key
30. 2026-06-07 Auth Docs URL: (none) → https://mailchimp.com/developer/transactional/docs/fundamentals/
31. 2026-06-07 API Style: (none) → rest
32. 2026-06-07 Base URL: (none) → https://mandrillapp.com/api/1.0/
33. 2026-06-07 API Version: (none) → 1
34. 2026-06-07 Versioning Scheme: (none) → url
35. 2026-06-07 Stability: (none) → ga
36. 2026-06-07 SDK Packages: PHP, Node.js, Python, Ruby → Node.js, Python, PHP, Ruby
37. 2026-06-07 MCP URL: (none) → https://mandrillapp.com/mcp
38. 2026-06-07 Quickstart URL: (none) → https://mailchimp.com/developer/transactional/guides/quick-start/
39. 2026-06-07 Error Format: (none) → vendor-specific
40. 2026-06-07 Webhook Signing: (none) → hmac_sha1
41. 2026-06-07 Webhook Events URL: (none) → https://mailchimp.com/developer/transactional/docs/webhooks/
42. 2026-06-07 Requires Verification: (none) → Yes
43. 2026-06-07 Starting Price Usd: (none) → 20
44. 2026-06-07 Price Basis: (none) → block
45. 2026-06-07 Launched At: (none) → 2012-01-01
46. 2026-06-07 Fields Not Found: (none) → ga_date, idempotency_supported
47. 2026-06-07 SDK Languages: PHP, Node.js, Python, Ruby → Node.js, Python, PHP, Ruby
48. 2026-06-07 SDK Packages: (none) → PHP, Node.js, Python, Ruby
49. 2026-06-07 Capabilities: {"smtp":true,"inbound":true,"analytics":true,"templates":true,"batch_send":true… → {"smtp":true,"inbound":true,"analytics":true,"templates":true,"batch_send":true…

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

curl -X POST https://apio.sh/api/feedback/mandrill \
  -H 'Content-Type: application/json' \
  -d '{"kind":"review","rating":5,"body":"Your experience with this API…"}'

curl -X POST https://apio.sh/api/suggest/mandrill/FIELD \
  -H 'Content-Type: application/json' \
  -d '{"value":"corrected value","citations":[{"url":"https://source.example/page","excerpt":"supporting quote"}],"note":"what changed and why"}'

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