Developer docs · InboxRatio Editorial
SendGrid email API: SDKs, docs and limits (2026)
Every link below points into SendGrid's official developer documentation and was checked on 10 September 2026. We record only what the vendor documents — a field we could not verify at the source is left out, never guessed.
From SendGrid's official docs · checked 10 September 2026
Docs, SDKs and limits
- Developer docs
- www.twilio.com/docs/sendgrid
- API reference
- www.twilio.com/docs/sendgrid/api-reference
- SDK languages
- C#GoJavaNode.jsPHPPythonRubyAs listed in SendGrid's official SDK docs
- SMTP relay
- Yes · SMTP docs
- Webhooks
- Webhook docsEvent Webhook
- Rate limits
- Each v3 API endpoint allows a fixed number of requests per refresh period; the limit, remaining requests and reset time are returned in X-RateLimit headers, and HTTP 429 is returned once the limit is exceeded. Source
- Pricing page
- www.twilio.com/en-us/products/email-api/pricing
From our feature matrix — documented by the vendor
API, SMTP and sending auth
- APIEmail API core product; API on all tiers
- SDKs / client librariesOfficial client libraries documented in SendGrid docs
- Public API docsPublic docs at twilio.com/docs/sendgrid
- WebhooksEvent Webhook (1 on trial, 2 Essentials, 5 Pro)
- SMTP APISMTP service alongside REST API
- SMTP relay'Twilio SendGrid Email API and SMTP service'
- Transactional email'The trusted SendGrid Email API for delivery at scale'
- SPF assistanceDomain authentication (SPF/DKIM) included on all plans incl. trial
- DKIM setupDomain authentication SPF/DKIM included on all plans
- DMARC supportDMARC guidance in docs/deliverability guide; no DMARC monitoring product stated on fetched pages
Features checked 10 September 2026. ✓ documented · ◐ limited or plan-gated · × documented as absent · — not documented. Documentation is not a measured result — see our methodology.
Pricing snapshot
Generated from our datasets — every value verified and dated
Frequently asked questions
Where are the official SendGrid API docs?
SendGrid's official developer documentation is at https://www.twilio.com/docs/sendgrid, and the API reference is at https://www.twilio.com/docs/sendgrid/api-reference. Links checked on 10 September 2026.
Does SendGrid have an SDK for Python?
Yes. Python is among the SDK languages listed in SendGrid's official docs: C#, Go, Java, Node.js, PHP, Python and Ruby (checked 10 September 2026).
Does SendGrid support SMTP relay?
Yes. SendGrid's official docs document SMTP relay sending: https://www.twilio.com/docs/sendgrid/for-developers/sending-email/getting-started-smtp (checked 10 September 2026).
What are the SendGrid API rate limits?
Each v3 API endpoint allows a fixed number of requests per refresh period; the limit, remaining requests and reset time are returned in X-RateLimit headers, and HTTP 429 is returned once the limit is exceeded. Source: SendGrid's official documentation at https://www.twilio.com/docs/sendgrid/api-reference/how-to-use-the-sendgrid-v3-api/rate-limits, checked 10 September 2026.
Does SendGrid offer webhooks?
Yes. SendGrid's official docs cover webhook event notifications (Event Webhook): https://www.twilio.com/docs/sendgrid/for-developers/tracking-events/event (checked 10 September 2026).