# ThreadCamp

> Programmatic inboxes, Resend-compatible sending, and forwarding/routing in one API - with built-in human-in-the-loop approvals. Give your AI agent a real email address.

ThreadCamp is the email API for AI agents: programmatic inboxes, Resend-compatible sending, and forwarding/routing Routes in one key - with built-in human-in-the-loop approvals. EU-resident (eu-west-2).

Public sandbox API key (test mode, safe to share): sk_test_sandbox_threadcamp_public_demo

## Start here
- [Documentation](https://www.threadcamp.com/docs): quickstart, concepts
- [API reference](https://www.threadcamp.com/docs/api): every endpoint
- [OpenAPI spec](https://www.threadcamp.com/openapi.json)
- [MCP server](https://www.threadcamp.com/docs/mcp): create_inbox, send_email, wait_for_message, create_route, add_domain...
- [Pricing](https://www.threadcamp.com/pricing) · [pricing.json](https://www.threadcamp.com/pricing.json)

## Core concepts
- Inbox: a real email address created via POST /v1/inboxes; has threads, messages, reply/forward.
- Autonomy policy: auto | approve-first (human one-click approval executes the send) | notify.
- Route: catch-all/alias forwarding to an address, webhook or inbox, with SRS so SPF/DMARC survive.
- Domain: add -> get MX/SPF/DKIM/DMARC records -> verify -> send & receive.

## Pillars
- [Custom domain email via API](https://www.threadcamp.com/custom-domain-email): Domain Email Identity (4,400/mo)
- [Email API for developers](https://www.threadcamp.com/email-api): Developer Email API (590/mo, rising)
- [Programmatic email forwarding](https://www.threadcamp.com/email-forwarding): Email Routing / Forwarding (1,900/mo)
- [Email infrastructure platform](https://www.threadcamp.com/email-infrastructure): Email Infrastructure Platform (210/mo, exploding)
- [Transactional email API](https://www.threadcamp.com/transactional-email-api): Transactional Sending (210+210/mo)
- [Email for AI agents](https://www.threadcamp.com/agent-email): Agent Email Platform (90->210/mo)
- [Catch-all email](https://www.threadcamp.com/catch-all-email): Catch-all Domain / Inbox (260/mo)

## Compare
- [AgentMail alternative](https://www.threadcamp.com/alternatives/agentmail): $20 -> $200 pricing cliff, no forwarding Routes, no scheduled send
- [Resend alternative](https://www.threadcamp.com/alternatives/resend): sending-only inbox model; one identity per domain, no inboxes
- [SendGrid alternative](https://www.threadcamp.com/alternatives/sendgrid): seat-based, complex, no agent/MCP tooling
- [ForwardEmail alternative](https://www.threadcamp.com/alternatives/forwardemail): forwarding-first; sending gated, routing is per-alias config
- [Mailgun alternative](https://www.threadcamp.com/alternatives/mailgun): ops-heavy; no agent tooling
- [MailSlurp alternative](https://www.threadcamp.com/alternatives/mailslurp): test-focused; no real sending/forwarding, no free tier

## Guides
- [Human-in-the-loop email for AI agents](https://www.threadcamp.com/human-in-the-loop-email)
- [How to receive email programmatically](https://www.threadcamp.com/receive-email-programmatically)
- [SRS email forwarding - preserve SPF on forwards](https://www.threadcamp.com/srs-email-forwarding)

## Integrations
- [Vercel AI SDK](https://www.threadcamp.com/integrations/vercel-ai-sdk)
- [LangChain](https://www.threadcamp.com/integrations/langchain)
- [OpenAI Agents SDK](https://www.threadcamp.com/integrations/openai-agents)
- [Claude Code](https://www.threadcamp.com/integrations/claude-code)
- [CrewAI](https://www.threadcamp.com/integrations/crewai)
- [n8n](https://www.threadcamp.com/integrations/n8n)

## Use cases
- [OTP retrieval agent](https://www.threadcamp.com/use-cases/otp-retrieval-agent): retrieve one-time passcodes and 2FA codes mid-task
- [Support agent](https://www.threadcamp.com/use-cases/support-agent): hold email conversations with customers, with human approval on replies
- [Signup automation](https://www.threadcamp.com/use-cases/signup-automation): sign up for services that require email verification
- [Outreach agent](https://www.threadcamp.com/use-cases/outreach-agent): send scheduled, approved outreach from a real domain
- [Notification agent](https://www.threadcamp.com/use-cases/notification-agent): send transactional notifications and alerts
- [Scheduling agent](https://www.threadcamp.com/use-cases/scheduling-agent): coordinate meetings over email threads

## Full text
- [llms-full.txt](https://www.threadcamp.com/llms-full.txt)