Resend

Best for: Prototypes and side projects - free to start, no sales call; Regulated or enterprise workloads - compliance attestations and an enterprise plan; AI agents and automation - an agent-ready surface (MCP / llms.txt)

Pricing model

Hybrid (base + usage) [2]resend.com/docs/knowledge-base/what-is-resend-pricing“Pro, $20/mo, 50,000, $0.90. Pro, $35/mo, 100,000, $0.90.”resend.com/pricing“ScaleRecommended. $90 / mo. 100,000 emails / mo. Extra emails: $0.90 / 1,000.”

Published pricing

✓ Yes [3]resend.com/docs/knowledge-base/what-is-resend-pricing“Plan, Price, Emails/mo, Overage per 1,000 emails. Free, $0/mo, 3,000, Not available. Pro, $20/mo, 50,000, $0.90.”resend.com/pricing“No daily limit; Dedicated IPs. Get started. ScaleRecommended. $90 / mo. 100,000 emails / mo. Extra emails: $0.90 / 1,000.”

Free tier

✓ Yes [4]resend.com/pricingresend.com/blog/new-free-tier“You can now send up to 3,000 emails a month (100 per day) on our free plan.”

Free tier details

$0/mo, 3,000 emails/month (100/day cap) [5]resend.com/docs/knowledge-base/what-is-resend-pricing“Free, $0/mo, 3,000, Not available.”resend.com/blog/new-free-tier“You can now send up to 3,000 emails a month (100 per day) on our free plan.”

Self-serve signup

✓ Yes [6]resend.com/docs/api-reference/api-keys/create-api-key“The API key can have full access to Resend's API or be only restricted to send emails.”resend.com/docs/send-with-nodejs“Prerequisites. Before you start, you'll need: ; 1. Install. Get the Resend Node.js SDK. ; 2. Send email using HTML.”

Requires sales call

✗ No [7]resend.com/pricingresend.com/enterprise

Enterprise plan

✓ Yes [8]resend.com/enterprise

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

Supported actions

send_email, get_email, list_emails, batch_send_emails, cancel_email, update_email, create_domain, get_domain, update_domain, delete_domain, list_domains, verify_domain, create_audience, get_audience, list_audiences, delete_audience, create_contact, get_contact, update_contact, delete_contact, list_contacts, create_api_key, list_api_keys, delete_api_key, create_broadcast, get_broadcast, send_broadcast, list_broadcasts, delete_broadcast [9]resend.com/docs/api-reference/domainsresend.com/docs/api-reference/introduction“The Resend API is built on REST principles.”resend.com/docs/api-reference/emails/send-emailresend.com/docs/api-reference/api-keys

Regions

US (us-east-1), EU - Ireland (eu-west-1), Brazil - São Paulo (sa-east-1), Japan - Tokyo (ap-northeast-1) [10]resend.com/docs/dashboard/domains/regions“All account data, including email metadata, logs, and API records, is stored in the United States regardless of the sending region you select. Choosing `eu-west-1` means your emails are dispatched fro”resend.com/blog/multi-region“Mar 6, 2023 — Users have the option to send transactional emails from three different regions.”resend.com/changelog/multi-region-for-everyone“Today, we're excited to expand our support to all users. Every Resend user can now send emails from the region that best fits their customers.”

Input types

JSON, HTML, plain text, base64 [11]resend.com/docs/api-reference/emails/send-email

Output types

JSON [12]resend.com/docs/api-reference/introduction“The Resend API is built on REST principles.”

Webhooks

✓ Yes [13]resend.com/docs/webhooks/introduction“Resend uses webhooks, which are real-time HTTPS requests that tell your application an event occurred, such as an email delivery notification or subscription”

Sandbox / test mode

✗ No [14]resend.com/docs/dashboard/emails/send-test-emails“We provide the following test email addresses to help you simulate different email events without damaging your domain reputation.”

SDK languages

Node.js, Python, Go, Ruby, PHP, Java [15]github.com/resendresend.com/docs/sdks“Open source client libraries for your favorite platforms. Ruby github.com/resend/resend-ruby.”

MCP server

✓ Yes [16]resend.com/docs/mcp-server“What can Resend's MCP Server do? Resend's MCP Server gives your AI agent native access to the full Resend platform through a single integration.”resend.com/changelog/mcp“The official Resend MCP server exposes 10 tool groups covering every Resend API: emails, contacts, broadcasts, domains, webhooks, segments,”

SOC 2

SOC 2 Type II [17]resend.com/security/soc-2“Resend is SOC 2 Type II compliant. We partner with third-party firms to conduct regular audits.”

HIPAA

✗ No [18]resend.com/security“GDPR Compliant We have made it a priority to protect your data.”resend.com/docs/security“Resend establishes policies and controls, monitors compliance with those controls, and proves the security and compliance to third-party auditors.”

GDPR

✓ Yes [19]resend.com/security“GDPR Compliant We have made it a priority to protect your data.”resend.com/blog/gdpr“Resend's compliance allows even more businesses to build their operations on top of Resend's infrastructure without compromising privacy or compliance.”

ISO 27001

✗ No [20]resend.com/security“GDPR Compliant We have made it a priority to protect your data.”resend.com/docs/security“Resend establishes policies and controls, monitors compliance with those controls, and proves the security and compliance to third-party auditors.”

PCI DSS

✗ No [21]resend.com/security“GDPR Compliant We have made it a priority to protect your data.”

Published SLA

✓ Yes [22]resend.com/enterprise

Rate limits

5 requests per second per team [23]resend.com/docs/api-reference/rate-limit“The default maximum rate limit is 5 requests per second per team. This limit applies across all API keys associated with your team.”resend.com/changelog/api-rate-limit“Every customer will have a rate limit of 2 requests per second by default, which should be sufficient for most use cases.”

Known restrictions

The default maximum rate limit is 5 requests per second per team, 100 emails/day on the free plan, Both sent and received emails count towards these quotas, All account data, including email metadata, logs, and API records, is stored in the United States regardless of the sending region you select, Max 50 recipient addresses per email, Max 40MB per email after Base64 encoding for attachments, Free plan has no overage capability [24]resend.com/docs/api-reference/rate-limit“The default maximum rate limit is 5 requests per second per team. This limit applies across all API keys associated with your team.”resend.com/docs/dashboard/domains/regions“All account data, including email metadata, logs, and API records, is stored in the United States regardless of the sending region you select.”resend.com/blog/new-free-tier“You can now send up to 3,000 emails a month (100 per day) on our free plan.”

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

Docs rendering: static · llms.txt present

API style

rest

Base URL

https://api.resend.com

Versioning

none

Stability

ga

Auth methods

api_key

Idempotency keys

✓ Yes

Error format

vendor-specific

Webhook signing

hmac_sha256

Rate limit

5 / second

SDKs

• Node.js resend · repo · updated 2026-06 · 914★
• Python resend · repo · updated 2026-06 · 122★
• Go github.com/resend/resend-go/v3 · repo · updated 2026-06 · 262★
• Ruby resend · repo · updated 2026-06 · 48★
• PHP resend/resend-php · repo · updated 2026-06 · 59★
• Java resend-java · repo · updated 2026-05 · 41★

• Auth docs
• Quickstart
• MCP server
• Webhook events

Launched

2023-01-01

Notable customers

Warner Bros, Gumroad, Tailwind, Replit, eBay, Max, A24 Films, Valentino, Mintlify, Raycast, Turso, Liveblocks, MrBeast, Nuxt, Payload Cloud, Firecrawl, Anghami, Inngest

• 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

Resend alternatives · Resend vs Mailgun · All Email APIs APIs

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

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

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

1. 2026-06-14 Score Docs Quality: 55 → 75
2. 2026-06-14 Score Agent Friendliness: 60 → 70
3. 2026-06-14 Robots Allows Agents: (none) → Yes
4. 2026-06-14 Has Structured Data: (none) → No
5. 2026-06-14 API Reference URL: (none) → https://resend.com/docs/api-reference/introduction
6. 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…
7. 2026-06-09 Best For: Prototypes and side projects — free to start, no sales call, Regulated or enter… → Prototypes and side projects - free to start, no sales call, Regulated or enter…
8. 2026-06-09 Score Agent Friendliness: (none) → 60
9. 2026-06-09 Score Pricing Transparency: (none) → 100
10. 2026-06-09 Score Setup Speed: (none) → 85
11. 2026-06-09 Score Docs Quality: (none) → 55
12. 2026-06-09 Score Procurement Friction: (none) → 100
13. 2026-06-09 Score Trust Readiness: (none) → 60
14. 2026-06-09 Best For: (none) → Prototypes and side projects — free to start, no sales call, Regulated or enter…
15. 2026-06-09 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
16. 2026-06-08 Llms Txt Present: (none) → Yes
17. 2026-06-08 Rendering: (none) → static
18. 2026-06-08 Openapi Spec URL: (none) → https://resend.com/openapi.json
19. 2026-06-08 Status Page URL: (none) → https://status.resend.com
20. 2026-06-08 Changelog URL: (none) → https://resend.com/changelog
21. 2026-06-08 Docs URL: (none) → https://resend.com/docs
22. 2026-06-08 Llms Txt URL: (none) → https://resend.com/llms.txt
23. 2026-06-07 SDK Packages: Node.js, Python, Go, Ruby, PHP, Java → Node.js, Python, Go, Ruby, PHP, Java
24. 2026-06-07 Summary Md: (none) → Resend is a developer-first REST email API for transactional, marketing, and in…
25. 2026-06-07 Github Stars: (none) → 913
26. 2026-06-07 Github Stars At: (none) → 2026-06-07T17:39:16.991Z
27. 2026-06-07 Requires Verification: (none) → Yes
28. 2026-06-07 Price Basis: (none) → 1,000 emails
29. 2026-06-07 Free Tier Limit: (none) → 3,000 emails/month
30. 2026-06-07 Notable Customers: (none) → Warner Bros, Gumroad, Tailwind, Replit, eBay, Max, A24 Films, Valentino, Mintli…
31. 2026-06-07 Fields Not Found: (none) → ga_date
32. 2026-06-07 Starting Price Usd: (none) → 20
33. 2026-06-07 Supported Regions: US East (North Virginia / us-east-1), EU West (Ireland / eu-west-1), SA East (S… → US (us-east-1), EU - Ireland (eu-west-1), Brazil - São Paulo (sa-east-1), Japan…
34. 2026-06-07 Vendor Description: Resend is the email API for developers → The best way to reach humans instead of spam folders. Deliver transactional and…
35. 2026-06-07 Primary Use Cases: transactional email, marketing email → transactional email, marketing email, inbound email
36. 2026-06-07 Supported Actions: send_email, send_batch_emails, list_emails, retrieve_email, update_email, cance… → send_email, get_email, list_emails, batch_send_emails, cancel_email, update_ema…
37. 2026-06-07 Input Types: JSON, HTML, plain text, base64-encoded attachments, remote file URLs → JSON, HTML, plain text, base64
38. 2026-06-07 SDK Languages: Node.js, PHP, Laravel, Python, Ruby, Go, Java, Rust, .NET → Node.js, Python, Go, Ruby, PHP, Java
39. 2026-06-07 SDK Packages: Node.js, PHP, Laravel, Python, Ruby, Go, Java, Rust, .NET → Node.js, Python, Go, Ruby, PHP, Java
40. 2026-06-07 Free Tier Details: $0/mo, 3,000 emails/month, 100 emails/day, 1,000 contacts/month, 1 domain, 5 AI… → $0/mo, 3,000 emails/month (100/day cap)
41. 2026-06-07 HIPAA: (none) → No
42. 2026-06-07 ISO 27001: (none) → No
43. 2026-06-07 PCI DSS: (none) → No
44. 2026-06-07 Rate Limit Requests: (none) → 5
45. 2026-06-07 Rate Limit Window: (none) → second
46. 2026-06-07 Known Restrictions: The default maximum rate limit is 5 requests per second per team. This limit ap… → The default maximum rate limit is 5 requests per second per team, 100 emails/da…
47. 2026-06-07 Auth Methods: (none) → api_key
48. 2026-06-07 Auth Docs URL: (none) → https://resend.com/docs/api-reference/introduction
49. 2026-06-07 Base URL: (none) → https://api.resend.com
50. 2026-06-07 Versioning Scheme: (none) → none

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/resend \
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  -d '{"kind":"review","rating":5,"body":"Your experience with this API…"}'

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  -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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