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

# Facilitator Service

> Circle's hosted x402 facilitator for USDC settlement on Arc, Base, and Polygon PoS

Facilitator Service is Circle's hosted
[x402](/gateway/nanopayments/concepts/x402) facilitator for sellers. Point your
HTTP API at Facilitator Service and start accepting x402 payments in USDC
without operating a relayer, funding a gas wallet, or building your own
sanctions screening. Circle verifies each payment authorization signed by the
buyer and submits the USDC transfer onchain.

Facilitator Service settles USDC on Arc, Base, and Polygon PoS through the
[EIP-3009](https://eips.ethereum.org/EIPS/eip-3009) `exact` scheme. It requires
a Circle [API key](/api-reference/keys#api-keys) to settle, but you can start
with the [keyless trial](/facilitator-service/keyless-trial) without a Circle
account.

<Info>
  **Disclaimer**: Facilitator Service is offered by Circle Technology Services,
  LLC, a software provider. Facilitator Service verifies buyer-signed EIP-3009
  USDC payment authorizations under the x402 protocol only — it does not hold,
  control, or transmit user funds, verify transaction purpose, or confirm agent
  authority scope.

  On Base and Polygon, settlements are subject to blockchain reorganization risk;
  Circle does not guarantee fund receipt. Arc settlements are final.

  Use of the Facilitator Service is subject to
  [Circle Console Service Terms](https://console.circle.com/legal/service-terms)
  and [Developer Terms](https://console.circle.com/legal/developer-terms). Not
  reviewed or approved by any regulatory authority. Features may change at any
  time. Nothing herein constitutes a commitment, warranty, or guarantee. Use
  involves risk.
</Info>

## Key features

<CardGroup cols={3}>
  <Card title="Accept x402 payments on Arc" icon="bolt">
    Price your API, data, or agent service per request and get paid in USDC on
    Arc, with Circle handling settlement onchain.
  </Card>

  <Card title="One integration, three blockchains" icon="arrows-turn-right">
    Point your seller at Facilitator Service once and accept x402 payments on
    Arc, Base, and Polygon PoS from the same integration.
  </Card>

  <Card title="Nothing to operate" icon="server">
    Circle broadcasts every transfer, pays settlement gas, and screens both
    parties before any money state is created.
  </Card>
</CardGroup>

## What you can build

<AccordionGroup>
  <Accordion title="Metered agent and API endpoints" icon="bolt">
    Charge per API call, per dataset query, or per agent task. Your seller asks for
    payment over x402 and calls Facilitator Service to settle the USDC transfer
    onchain, with no billing relationship to set up per buyer.
  </Accordion>

  <Accordion title="Move existing x402 volume to Circle" icon="arrow-right-arrow-left">
    Add Arc coverage to your existing x402 seller without losing Base or Polygon
    PoS. One facilitator settles USDC across all three blockchains from the same
    integration.
  </Accordion>

  <Accordion title="Marketplace settlement" icon="network-wired">
    Settle USDC payments between participants on your platform, with address
    screening running before any payment record is created.
  </Accordion>

  <Accordion title="Agent payment acceptance in USDC" icon="robot">
    Add an agent payment acceptance path in USDC without building relayer or gas
    infrastructure. Buyers can pay from a standard wallet address or a deployed
    smart contract account.
  </Accordion>
</AccordionGroup>

## Get started

<CardGroup cols={2}>
  <Card title="How Facilitator Service works" icon="circle-info" href="/facilitator-service/how-it-works">
    Understand the x402 protocol, the roles, and how Facilitator Service settles
    USDC through EIP-3009
  </Card>

  <Card title="Accept x402 payments" icon="store" href="/facilitator-service/quickstart">
    Accept your first x402 payment on Arc testnet with the keyless trial
  </Card>

  <Card title="The keyless trial" icon="key" href="/facilitator-service/keyless-trial">
    Understand the trial allowance, seller accounts, and how Facilitator Service
    tracks ownership per `payTo`
  </Card>

  <Card title="Supported networks" icon="link" href="/facilitator-service/supported-networks">
    Chain IDs, USDC contracts, and confirmation thresholds for Arc, Base, and
    Polygon PoS
  </Card>
</CardGroup>