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

# Initialize Agent Request

> Validates access and initializes an agent request session.



## OpenAPI

````yaml POST /protocol/agents/initialize/{agentId}
openapi: 3.1.0
info:
  title: Nevermined API
  description: >-
    API for managing AI agents, payment plans, and x402 payments in the
    Nevermined ecosystem.


    ## Prerequisites


    You need a Nevermined API Key to authenticate. Get one at
    [nevermined.app](https://nevermined.app) under **Settings > API Keys**.


    See the [5-Minute Setup Guide](/docs/integrate/quickstart/5-minute-setup)
    for detailed instructions.
  license:
    name: MIT
  version: 1.0.0
servers:
  - url: https://api.sandbox.nevermined.app/api/v1
    description: Sandbox (Testing) - Base Sepolia
  - url: https://api.live.nevermined.app/api/v1
    description: Live (Production) - Base Mainnet
security:
  - bearerAuth: []
tags:
  - name: Protocol - Agents
    description: Endpoints for registering and managing AI agents
  - name: Protocol - Plans
    description: Endpoints for creating and managing payment plans
  - name: Protocol - Credits
    description: Endpoints for minting and redeeming credits
  - name: Protocol - Access
    description: Endpoints for access tokens and request validation
  - name: X402 - Permissions
    description: Endpoints for x402 delegated permissions
paths:
  /protocol/agents/initialize/{agentId}:
    post:
      tags:
        - Protocol - Access
      summary: Initialize Agent Request
      description: Validates access and initializes an agent request session.
      operationId: initializeAgentRequest
      parameters:
        - name: agentId
          in: path
          description: The agent's unique identifier
          required: true
          schema:
            type: string
      requestBody:
        description: Request initialization data
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/InitializeAgentRequest'
      responses:
        '200':
          description: Request initialized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InitializeAgentResponse'
        '401':
          description: Unauthorized
        '402':
          description: Payment required - insufficient credits
components:
  schemas:
    InitializeAgentRequest:
      type: object
      properties:
        accessToken:
          type: string
        requestData:
          type: object
    InitializeAgentResponse:
      type: object
      properties:
        requestId:
          type: string
        isValid:
          type: boolean
        balance:
          $ref: '#/components/schemas/Balance'
    Balance:
      type: object
      properties:
        isSubscriber:
          type: boolean
        total:
          type: integer
        used:
          type: integer
        remaining:
          type: integer
        expiresAt:
          type: string
          format: date-time
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        Your Nevermined API Key (starts with 'nvm:'). Get one at
        [nevermined.app](https://nevermined.app) under **Settings > API Keys**.

````