> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sault.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> The console for agentic payments — vaults, permissioned agents, and automatic HTTP 402 settlement across rails.

SAULT is the control layer for agents that spend money. Builders open a vault, set per-agent policies, and connect agents — SAULT does the rest. When an agent calls a paid service that responds with `402 Payment Required`, SAULT picks the rail, signs the credential inside a secure enclave, and retries the request.

Every rail. Your rules.

<CardGroup cols={2}>
  <Card title="Rail-agnostic" icon="arrows-split-up-and-left">
    Agents call URLs. SAULT picks the rail (x402, MPP, more later). Your code does not change when the rail does.
  </Card>

  <Card title="Multi-chain vault" icon="link">
    One vault holds funds across Tempo, Base, and Solana. Spend on whichever chain a service accepts.
  </Card>

  <Card title="Funds you control" icon="shield-halved">
    Private keys live in a secure enclave. SAULT signs on your authorisation; you revoke at any time.
  </Card>

  <Card title="Per-agent limits" icon="sliders">
    Daily spend and per-request maximum. Checked before anything is signed. Edits take effect on the next request.
  </Card>
</CardGroup>

## How agents connect

Every surface is a thin wrapper over the same SAULT agent API. Pick what matches your agent.

| Agent platform                                   | Integration                   | Discovery                                           |
| ------------------------------------------------ | ----------------------------- | --------------------------------------------------- |
| Claude Code, Cursor, Codex, Cline, local scripts | [CLI](/quickstart/cli)        | Bundled `SKILL.md` teaches commands                 |
| Claude Desktop, any MCP-capable client           | [Hosted MCP](/quickstart/mcp) | Tool descriptions + `SKILL.md` served by the server |

## Quick setup

<Steps>
  <Step title="Open the console">
    Sign in at [app.sault.ai](https://app.sault.ai). Onboarding creates your vault and a first agent.
  </Step>

  <Step title="Pair your agent">
    Run `sault login` (CLI) or call the `sault_login` MCP tool. Approve the request in the console.
  </Step>

  <Step title="Fund the vault">
    Send USDC to the vault address, or add funds with a card from the console. See [Top Up](/guides/top-up). The agent can pay as soon as funds settle.
  </Step>
</Steps>