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

# Supported kinds



## OpenAPI

````yaml GET /supported
openapi: 3.1.0
info:
  title: x402 Facilitator API (atum-escrow)
  version: 1.0.0
  description: >
    The standard x402 v2 facilitator API as served for the atum-escrow scheme. A
    resource server calls /verify then /settle to validate and settle a payment
    credential, and /supported to discover which scheme/network/token
    combinations the facilitator can handle. The atum-escrow request/response
    shapes are defined by referenced JSON Schemas; this document specifies the
    endpoints and the atum-escrow-specific behavior. Any facilitator that serves
    this contract is interchangeable behind it.
servers:
  - url: https://payment-gw.production-mainnet.atum.xyz/x402/v1
    description: Mainnet
  - url: https://payment-gw.production-testnet.atum.xyz/x402/v1
    description: Testnet
security: []
paths:
  /supported:
    get:
      summary: List the scheme/network/token combinations the facilitator handles.
      operationId: supported
      parameters:
        - name: chain
          in: query
          required: false
          description: Filter to a single CAIP-2 chain.
          schema:
            type: string
        - name: token
          in: query
          required: false
          description: Filter to a token by symbol or CAIP-19 asset id.
          schema:
            type: string
        - name: limit
          in: query
          required: false
          schema:
            type: integer
            minimum: 1
        - name: offset
          in: query
          required: false
          schema:
            type: integer
            minimum: 0
      responses:
        '200':
          description: Supported kinds, settlement signers, and extensions.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SupportedResponse'
components:
  schemas:
    SupportedResponse:
      type: object
      required:
        - kinds
        - signers
        - extensions
      properties:
        kinds:
          type: array
          items:
            $ref: '#/components/schemas/SupportedKind'
        signers:
          type: object
          description: >
            Map of CAIP-2 chain id to the facilitator's settlement signer
            addresses. Empty for atum-escrow: the facilitator holds no
            settlement key, since settlement is executed permissionlessly by
            settlers.
          additionalProperties:
            type: array
            items:
              type: string
        extensions:
          type: array
          items:
            type: string
    SupportedKind:
      type: object
      required:
        - x402Version
        - scheme
        - network
      properties:
        x402Version:
          type: integer
          const: 2
        scheme:
          type: string
        network:
          type: string
          description: CAIP-2 chain id.
        extra:
          type: object
          description: Per-kind detail; supported tokens for the network are listed here.
          properties:
            tokens:
              type: array
              items:
                type: string

````