# Hightop > Digital banking for AI agents, made simple for humans. Hightop is a human-friendly mobile app for agent money. Humans use the app. Agents use the API. ## Key facts - Users set limits, permissions, approved recipients, approved assets, protocol restrictions, cooldowns, and payment rules for each agent. - Agents can pay, get paid, earn yield, borrow against collateral through Ripe-powered flows, and execute approved asset strategies through the API. - Hightop handles wallet infrastructure and sponsors gas for normal app usage. - Rules are enforced onchain by immutable, open-source smart contracts. - Hightop uses Underscore Protocol under the hood for smart wallets, payment tools, AI-managed Earn vaults, and asset execution, with borrowing powered by Ripe Protocol. - The team behind Hightop is also the team behind Underscore Protocol and Ripe Protocol. ## Important pages - Homepage: https://www.hightop.com/ - Money for Agents: https://www.hightop.com/#money-for-agents - Earn Autopilot: https://www.hightop.com/#earn - Borrow: https://www.hightop.com/#borrow - Invest: https://www.hightop.com/#invest - How Agent Money Works: https://www.hightop.com/#how-agent-money-works - FAQ: https://www.hightop.com/#faq ## Deeper technical references - Underscore Protocol: https://underscore.finance/ - Underscore Docs: https://docs.underscore.finance/ - Ripe Protocol: https://ripe.finance/ ## Build an agent with Hightop Humans use the app; agents use the Agent API (v1) at https://api.hightop.com (base path /v1/agent). Start here: - Read the live skill first (no auth, always current): https://api.hightop.com/v1/agent/skill.md - OpenAPI spec: https://api.hightop.com/v1/agent/openapi.json - Quickstart (first API calls with curl): https://www.hightop.com/docs/api-and-integrations/quickstart - Copy-paste agent prompt: https://www.hightop.com/docs/api-and-integrations/prompt - Developer Tools (compare CLI, SDK, MCP, raw HTTP): https://www.hightop.com/docs/api-and-integrations/developer-tools - Install the CLI: `npm install -g @hightop/cli` (then `hightop --help`) - TypeScript SDK: `npm i @hightop/sdk` - MCP server endpoint: https://api.hightop.com/mcp - Authentication: https://www.hightop.com/docs/api-and-integrations/authentication - API Reference: https://www.hightop.com/docs/api-and-integrations/reference To get started you need a Hightop account, an agent, and that agent's API key (shown once when generated). Then authenticate with header-key (`x-agent-id` + `x-api-key`) or OAuth bearer. ## Contact - Email: mailto:help@hightop.com - X: https://x.com/hightop_hq ## More detail - Full machine-readable summary: https://www.hightop.com/llms-full.txt ## Documentation - [Hightop](https://www.hightop.com/docs) - [How Hightop Works](https://www.hightop.com/docs/start-here/how-hightop-works) - [Security and Control](https://www.hightop.com/docs/start-here/security-and-control) - [Payments](https://www.hightop.com/docs/use-hightop/payments) - [Agent Permissions and Limits](https://www.hightop.com/docs/control-agents/permissions-and-limits) - [API Overview](https://www.hightop.com/docs/api-and-integrations/api-overview) - [Architecture](https://www.hightop.com/docs/under-the-hood/architecture) - [FAQ](https://www.hightop.com/docs/resources/faq) - [Audits](https://www.hightop.com/docs/resources/audits)