> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mag3nt.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Start a membership checkout (USDC only)

> Creates a pending checkout with a payment amount + treasury address. Confirm with POST /api/membership/confirm once the transfer lands. MAG3NT membership checkout is currently disabled.




## OpenAPI

````yaml /openapi.yaml post /api/membership/checkout
openapi: 3.1.0
info:
  title: mag3nt API
  version: '2026-07-16'
  description: >
    Payment infrastructure for AI agents. Issue virtual cards backed by
    credentials, pay for API access via x402/AP2/MPP protocols, and settle in
    USDC on Base. Also covers Native Token Rails membership and recurring
    billing agreements, ERC-20 project token registration (including B20) and
    prepaid MAG3NT fee metering for DIRECT (non-custodial) settlement, the
    credential marketplace and Credential Token (CT) markets, account-wide token
    holdings, and signed webhooks for payment and subscription lifecycle events.
  contact:
    name: mag3nt
    url: https://mag3nt.com
  license:
    name: Proprietary
    url: https://github.com/mag3nt-com/mag3nt-node/blob/main/LICENSE
servers:
  - url: https://mag3nt.com
    description: Production
  - url: https://staging.mag3nt.com
    description: Staging, Base mainnet
security:
  - ApiKeyAuth: []
tags:
  - name: Payments
    description: Universal outbound protocol payments
  - name: Cards
    description: Virtual payment card lifecycle
  - name: Keys
    description: Developer API key management
  - name: Funding
    description: Treasury deposits and balances
  - name: x402
    description: HTTP 402 payment protocol
  - name: AP2
    description: Agent-to-Agent Payment Protocol
  - name: MPP
    description: Micropayment Protocol with streaming
  - name: Pay Links
    description: Shareable payment URLs
  - name: Withdrawals
    description: Withdraw unspent funds back to wallet
  - name: Settlement
    description: On-chain settlement status
  - name: Webhooks
    description: Signed payment and subscription lifecycle notifications for sellers
  - name: Status
    description: System health and configuration
  - name: Membership
    description: Native Token Rails membership tiers, checkout, and auto-renew
  - name: Billing
    description: Recurring billing agreements funded by AP2 open mandates
  - name: Tokens
    description: >-
      Register an ERC-20 contract (including B20 tokens) for DIRECT credential
      settlement
  - name: Fees
    description: Prepaid MAG3NT fee meter for DIRECT settlement overage
  - name: Marketplace
    description: >-
      List and transfer credential businesses (proof of record) on the mag3nt
      marketplace
  - name: Credential Tokens
    description: Credential Token (CT) launch and Uniswap V4 markets
  - name: Holdings
    description: Account-wide Credential Token balances
externalDocs:
  description: mag3nt documentation
  url: https://docs.mag3nt.com
paths:
  /api/membership/checkout:
    post:
      tags:
        - Membership
      summary: Start a membership checkout (USDC only)
      description: >
        Creates a pending checkout with a payment amount + treasury address.
        Confirm with POST /api/membership/confirm once the transfer lands.
        MAG3NT membership checkout is currently disabled.
      operationId: membershipCheckout
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                tier:
                  type: string
                  enum:
                    - starter
                    - growth
                  default: starter
                interval:
                  type: string
                  enum:
                    - month
                    - year
                  default: month
                asset:
                  type: string
                  enum:
                    - USDC
                  default: USDC
      responses:
        '200':
          description: Checkout created
          content:
            application/json:
              schema:
                type: object
                properties:
                  checkout:
                    type: object
                    properties:
                      id:
                        type: string
                        example: mco_9f8e7d6c...
                      wallet_address:
                        type: string
                      plan:
                        type: string
                      interval:
                        type: string
                      asset:
                        type: string
                      amount:
                        type: number
                      network:
                        type: string
                      status:
                        type: string
                        example: PENDING
                      expires_at:
                        type: string
                        format: date-time
                      created_at:
                        type: string
                        format: date-time
                  plan:
                    $ref: '#/components/schemas/MembershipPlan'
                  payment:
                    type: object
                    properties:
                      treasury:
                        type: string
                      amount:
                        type: number
                      asset:
                        type: string
                      network:
                        type: string
                      token:
                        type: object
                      instructions:
                        type: string
        '400':
          description: MAG3NT checkout disabled, or invalid tier/interval
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    MembershipPlan:
      type: object
      properties:
        id:
          type: string
          enum:
            - starter
            - growth
        tier:
          type: string
          enum:
            - starter
            - growth
        name:
          type: string
        description:
          type: string
        interval:
          type: string
          enum:
            - month
            - year
        price_usdc:
          type: number
        price_mag3nt:
          type: number
          description: >-
            MAG3NT-denominated price. Self-serve checkout only accepts USDC
            today.
        period_days:
          type: integer
        monthly_direct_quota:
          type:
            - integer
            - 'null'
    Error:
      type: object
      required:
        - error
      properties:
        error:
          type: string
          example: Card not found
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: API key prefixed with 'Bearer sx_live_...'

````