I am trying to learn Google Speech to Text API.

When I am trying to expore the API in google and provided the input in request.

I am getting below error response:

{
  "error": {
    "code": 429,
    "message": "Quota exceeded for quota metric 'Requests' and limit 'Requests per minute' of service 'speech.googleapis.com' for consumer 'project_number:<project_number>'.",
    "status": "RESOURCE_EXHAUSTED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "RATE_LIMIT_EXCEEDED",
        "domain": "googleapis.com",
        "metadata": {
          "quota_limit_value": "0",
          "quota_metric": "speech.googleapis.com/default_requests",
          "service": "speech.googleapis.com",
          "consumer": "projects/<project_number>",
          "quota_limit": "DefaultRequestsPerMinutePerProject",
          "quota_location": "global"
        }
      },
      {
        "@type": "type.googleapis.com/google.rpc.Help",
        "links": [
          {
            "description": "Request a higher quota limit.",
            "url": "https://cloud.google.com/docs/quota#requesting_higher_quota"
          }
        ]
      }
    ]
  }
}

I have not made any changes to the limits. Is anybody aware how to increase limits?