Resend vs SendGrid vs ThreadCamp
A neutral, fact-checked comparison of Resend, SendGrid and ThreadCamp across the five axes that matter for agent and app email: inboxes, sending, forwarding, agent tooling and pricing. Where a detail is not in our research notes, we link to the vendor's docs rather than guess.
| Axis | Resend | SendGrid | ThreadCamp |
|---|---|---|---|
| Inboxes | Inbound webhook, but no inbox primitive or threads | See their docs | Real inboxes with threads, reply and forward (POST /v1/inboxes) |
| Sending | Transactional sending; Free 3,000/mo (1 domain), Pro $20/mo 50,000 | See their docs | Resend-compatible send + scheduled_at + batch |
| Forwarding | No forwarding to an external address | See their docs | Catch-all + alias Routes with SRS, unlimited domains |
| Agent / MCP tooling | See their docs | See their docs | Hosted + stdio MCP, sandbox keys, wait_for_message |
| Pricing shape | Free, Pro $20/mo, Scale from $90/mo; overage $0.90/1k | See their docs | Free, $19/mo, $79/mo; metered $1.00/1k |
ThreadCamp unifies these axes as the one email API for AI agents - with forwarding Routes and SRS built in.
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Questions
Resend vs SendGrid - which should I use?
It depends on the axis. Compare Resend and SendGrid across inboxes, sending, forwarding, agent tooling and pricing in the table above. Where a detail is not published in our research notes we defer to their docs. ThreadCamp covers all five axes under one key.
Where does ThreadCamp fit against Resend and SendGrid?
ThreadCamp is the email API for AI agents: real inboxes with threads, Resend-compatible sending with scheduled_at and batch, catch-all and alias forwarding Routes with SRS, an MCP server, and Free / $19 / $79 pricing with metered overage.
Try the one that does all five.
No credit card. Full API, MCP and webhooks on the free tier.