> ## 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.

# Execute a universal outbound payment (alias of /api/pay)

> Identical handler to POST /api/pay. Prefer this path when disambiguating from the /api/pay/{code}/* pay-link routes.



## OpenAPI

````yaml /openapi.yaml post /api/pay/external
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/pay/external:
    post:
      tags:
        - Payments
      summary: Execute a universal outbound payment (alias of /api/pay)
      description: >-
        Identical handler to POST /api/pay. Prefer this path when disambiguating
        from the /api/pay/{code}/* pay-link routes.
      operationId: paymentsExecuteExternal
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - card_id
                - card_token
                - url
              properties:
                card_id:
                  type: string
                  description: Card identifier (sx_...)
                card_token:
                  type: string
                  description: Card secret token (tok_...)
                url:
                  type: string
                  description: The external payment-protected URL to pay
                method:
                  type: string
                  default: POST
                  description: HTTP method to use when probing the URL
                body:
                  type: object
                  description: JSON request body to trigger a priced challenge
                headers:
                  type: object
                  description: Optional headers for the probe request
      responses:
        '200':
          description: Payment successful
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                  transaction_id:
                    type: string
                  amount_debited:
                    type: number
                  merchant_amount:
                    type: number
                  platform_fee:
                    type: number
                  token:
                    type: string
                  network:
                    type: string
                  protocol:
                    type: string
                  settlement:
                    type: object
                    properties:
                      status:
                        type: string
                      tx_hash:
                        type: string
        '400':
          description: Invalid request
        '403':
          description: Insufficient balance or card inactive
        '410':
          description: Endpoint removed or resource gone
        '422':
          description: No payable option offered by merchant
      security:
        - ApiKeyAuth: []
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: Authorization
      description: API key prefixed with 'Bearer sx_live_...'

````