Stack0

Your agent can think.
Stack0 lets it act.

Send emails. Store files. Update CRMs. Browse the web. Give your AI agent real-world capabilities with one SDK.

Get StartedView Docs
agent.ts
// Your agent, now with superpowers
 
User: "Send the weekly sales report to the team and update HubSpot"
 
Agent: I'll send the report and update the CRM now.
 
await stack0.email.send({
  to: ['team@company.com'],
  subject: 'Weekly Sales Report',
  html: reportHtml,
})
 
await stack0.integrations.hubspot.createNote({
  contactId: 'abc123',
  body: 'Weekly report sent on Jan 27',
})
 
Agent: Done! Email sent and HubSpot updated.

Works with:

OOpenClaw
CClaude Desktop
LLangChain
CrCrewAI
AAutoGPT
</>Custom

AI agents are stuck in a sandbox.

The missing piece isn't intelligence. It's infrastructure.

Today's agents can:

  • Analyze documents
  • Write code
  • Answer questions
  • Search the web
  • Generate content

But they can't:

  • Send an email
  • Store a file
  • Update your CRM
  • Connect to Slack
  • Extract web data

Your agent needs APIs to send emails, integrations to update Salesforce, and storage for files. That's Stack0.

Everything your agent needs to act in the world.

Send Emails

"Send the weekly report to my team"

Transactional & bulkAttachmentsOpen & click trackingTemplates
typescript
await stack0.email.send({
  to: ['sarah@company.com', 'mike@company.com'],
  subject: 'Weekly Report - Jan 27',
  html: reportHtml,
  attachments: [{ filename: 'report.pdf', content: pdfBuffer }]
})

Update CRMs & Apps

"Add this lead to HubSpot and notify the sales channel"

350+ integrationsRead & write accessOAuth handledUnified API pattern
typescript
// Create contact in HubSpot
await stack0.integrations.hubspot.createContact({
  email: 'lead@bigcorp.com',
  firstName: 'Jane',
  company: 'BigCorp',
})
 
// Post to Slack
await stack0.integrations.slack.sendMessage({
  channel: '#sales-leads',
  text: 'New lead: Jane from BigCorp',
})

Store & Retrieve Files

"Save this receipt and add it to my expense folder"

Global CDNImage transformsPrivate files with signed URLsMetadata & search
typescript
const file = await stack0.cdn.upload({
  file: receiptBuffer,
  filename: 'receipt-amazon-jan27.pdf',
  folder: 'expenses/2024/january',
  metadata: { vendor: 'Amazon', amount: 34.99 },
})
 
// Retrieve later
const receipts = await stack0.cdn.list({
  folder: 'expenses/2024/january'
})

Extract Web Data

"Get the pricing info from that competitor's website"

Zod schema validationHandles JS renderingProxy rotationRetry handling
typescript
const data = await stack0.extraction.extract({
  url: 'https://competitor.com/pricing',
  schema: z.object({
    plans: z.array(z.object({
      name: z.string(),
      price: z.number(),
      features: z.array(z.string()),
    })),
  }),
})

Built for trust.

AI agents handling real actions need real security.

Audit Logs

Every action logged with timestamp, context, and result.

Scoped Permissions

Grant only the capabilities your agent needs.

Rate Limits

Prevent runaway agents with configurable limits.

typescript
// Example: Scoped agent with only email and Slack access
const stack0 = new Stack0({
  apiKey: process.env.STACK0_API_KEY,
 
  // Only enable what this agent needs
  capabilities: ['email', 'integrations.slack', 'integrations.hubspot'],
 
  // No access to CDN, extraction, etc.
})

What people are building.

Personal Assistant

An agent that manages your digital life

  • Checks email, summarizes important messages
  • Sends replies on your behalf
  • Stores and organizes documents
  • Updates your CRM with new contacts

Stack0 services: Email, CDN, Integrations

Sales Development Agent

AI SDR that actually sends emails and updates CRM

  • Researches leads from LinkedIn
  • Writes personalized outreach emails
  • Sends emails to prospects
  • Logs all activity to HubSpot automatically

Stack0 services: Email, Integrations (HubSpot, Slack)

Content Operations Agent

Automated content pipeline from idea to published

  • Generates blog post drafts
  • Creates social media variations
  • Stores and organizes images
  • Notifies team when content is ready

Stack0 services: CDN, Integrations (Notion, Slack)

FAQ

Do I need to change my agent framework?

No. Stack0 works alongside your existing setup. We provide integrations for OpenClaw, Claude Desktop (MCP), LangChain, and a REST API for custom agents. Your agent calls Stack0 when it needs to take an action.

Is my data secure?

Yes. All data is encrypted in transit and at rest. Credentials are stored in secure vaults. Audit logs track every action your agent takes.

What integrations do you support?

350+ and growing: HubSpot, Salesforce, Slack, Google Drive, Dropbox, Gmail, Notion, Airtable, and more.

Give your agent the power to act.

Plans start at $5/month. Set up in 5 minutes.

Get StartedView Docs