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

# Sponsor Intent

> Submit a signed transaction intent for sponsorship via the v5 Universal Paymaster.



## OpenAPI

````yaml POST /sponsor
openapi: 3.1.0
info:
  title: VelumX Relayer API
  description: >-
    Infrastructure-grade gasless transaction sponsorship for the Stacks
    ecosystem.
  version: 1.0.0
  license:
    name: MIT
servers:
  - url: https://api.velumx.xyz/api/v1
    description: Production Relayer
security:
  - ApiKeyAuth: []
paths:
  /sponsor:
    post:
      summary: Sponsor Signed Intent (v5)
      description: >-
        Submit a signed transaction intent for sponsorship via the v5 Universal
        Paymaster.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                intent:
                  type: object
                  properties:
                    signature:
                      type: string
                    payload:
                      type: string
                    feeToken:
                      type: string
                    maxFee:
                      type: string
                  required:
                    - signature
                    - payload
                    - feeToken
                    - maxFee
      responses:
        '200':
          description: Sponsorship result
          content:
            application/json:
              schema:
                type: object
                properties:
                  txid:
                    type: string
                  status:
                    type: string
components:
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key

````