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

# Facilitators

> x402 payment facilitators that settle agentic payments on Stable.

Agentic payments on Stable allow AI agents and autonomous systems to pay for services without human intervention. Facilitators settle x402 payments on-chain so that developers do not need to run their own settlement infrastructure.

## Overview table

| **Provider**                                    | **Category**     | **Docs / Get Started**                                                                                     | **Notes**                                                                            |
| :---------------------------------------------- | :--------------- | :--------------------------------------------------------------------------------------------------------- | :----------------------------------------------------------------------------------- |
| [**Semantic Pay**](https://x402.semanticpay.io) | x402 facilitator | [https://docs.semanticpay.io/supported-chains#stable](https://docs.semanticpay.io/supported-chains#stable) | Public x402 facilitator for Stable; verifies and settles USDT0 payments via ERC-3009 |

## Semantic Pay

Payment infrastructure for AI agents: trustless, P2P, and permissionless. Semantic Pay operates as an x402-compatible payment facilitator on Stable, settling USDT0 payments via ERC-3009 (`transferWithAuthorization`). Agents do not need gas tokens in their wallets.

Developers integrating x402 on Stable point their middleware to `https://x402.semanticpay.io`. No custom settlement infrastructure is required.

**Capabilities**

* Payment payload verification (`/verify`) and on-chain settlement (`/settle`) via USDT0
* Gasless transfers using ERC-3009 `transferWithAuthorization`
* Spend limits, approval flows, and kill switches for agent oversight
* End-to-end traceability with full audit logging from intent through settlement
* Event callbacks for real-time payment lifecycle updates

**Facilitator endpoint:** `https://x402.semanticpay.io`

**Docs:** [https://docs.semanticpay.io/supported-chains#stable](https://docs.semanticpay.io/supported-chains#stable)

***

Have an agentic payments integration with Stable? Reach out at [bizdev@stable.xyz](mailto:bizdev@stable.xyz).