Is it related to Rate Limit?

Question

I'm using railway GraphQL API to provide my service for my customers, so we are actively working and testing multiple API calls. Today lately I was facing this error.

```json
{
  "errors": [
    {
      "message": "Failed reading: not a valid json value",
      "extensions": {
        "path": "$",
        "code": "remote-schema-error"
      }
    }
  ]
}
```

During my debugging, the same API call in railway GraphQL Playground, I though it might be related to Rate Limit, but not sure (looking out for a correction)

**How I was able to resolve the issue:**
I created another token and used it, this resolved the issue.

**Need Clarification On**
1. Is the above solution a correct way of resolving the issue?
2. Does the error has any relation with rate limit?
3. If now, how we can utilise Railway for our customers?