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

# Introduction

> Tentacle Pay is the payment infrastructure for the agentic economy on Sui.

Tentacle Pay ships the economic rails for AI agents on [Sui](https://sui.io) — so agents can pay and get paid without a human in the loop.

Agents need to buy data, call APIs, and settle with other agents at machine speed. Tentacle Pay gives them a wallet they control, an HTTP-native payment rail ([x402](https://x402.org)), and a single Sui balance they can spend across chains.

<CardGroup cols={3}>
  <Card title="Wallet" icon="wallet" href="/wallet/overview">
    A wallet your agent holds and spends on its own — with limits it can't break. Drop-in `tpay curl` clears x402 paywalls automatically.
  </Card>

  <Card title="x402 on Sui" icon="bolt" href="/x402/overview">
    Any API, MCP server, or agent can charge for a request over HTTP. Stablecoins settle gasless on Sui through the Tentacle Pay facilitator.
  </Card>

  <Card title="Cross-Chain" icon="route" href="/cross-chain/overview">
    Hold one Sui wallet, pay services on other chains. The agent pays in Sui stablecoins; Tentacle Pay settles on the destination.
  </Card>
</CardGroup>

## Why Sui

Sui covers gas for [stablecoin transfers](https://blog.sui.io/sui-launches-gasless-stablecoin-transfers/) at the network level: an agent can move USDC and other supported stablecoins without holding a gas token, with sub-second finality and parallel execution. That makes Sui a natural home for high-frequency, low-value agent payments.

Tentacle Pay builds on that foundation. The facilitator sponsors gas for everything Sui's native path doesn't cover — sub-cent stablecoin payments and any non-stablecoin coin — so an agent only ever needs a stablecoin balance to start paying, and no payment fails for lack of SUI.

## Start building

<Tip>
  Using an AI coding agent? Install the [Tentacle Pay skills](/skills) and it can follow these guides for you — set up the wallet or wire up x402 from plain-language requests.
</Tip>

<CardGroup cols={2}>
  <Card title="Set up the wallet" icon="terminal" href="/wallet/get-started">
    Install `tpay`, create a wallet, and let your agent pay for its first x402 API.
  </Card>

  <Card title="Charge for your API" icon="server" href="/x402/quickstart-for-sellers">
    Put an x402 paywall in front of any endpoint in a few lines.
  </Card>

  <Card title="Pay from an agent" icon="robot" href="/x402/quickstart-for-agents">
    Wrap `fetch` so your agent settles x402 payments automatically.
  </Card>

  <Card title="How it works" icon="book-open" href="/concepts">
    The protocol end to end — x402, the facilitator, gasless settlement, and MPC dWallets.
  </Card>
</CardGroup>

## Hosted endpoints

<CardGroup cols={2}>
  <Card title="facilitator.tentaclepay.com" icon="shield-check" href="https://facilitator.tentaclepay.com">
    The x402 facilitator — verifies payment payloads and settles them on Sui.
  </Card>

  <Card title="github.com/tentaclepay" icon="github" href="https://github.com/tentaclepay">
    Open-source SDKs, the wallet, smart contracts, and the facilitator.
  </Card>
</CardGroup>