Error Handling

Overview

Tokenlio API uses standard HTTP status codes and returns detailed error responses to help you diagnose and handle issues.

HTTP Status Codes

Code	Meaning	Description
200	OK	Request succeeded
400	Bad Request	Invalid request parameters
401	Unauthorized	Invalid or missing API key
403	Forbidden	Insufficient permissions
404	Not Found	Resource not found
429	Too Many Requests	Rate limit exceeded
500	Internal Server Error	Server error
502	Bad Gateway	Upstream provider error
503	Service Unavailable	Temporary unavailability

Error Response Format

All errors return JSON with the following structure:

{
  "error": {
    "code": "invalid_api_key",
    "message": "Invalid authentication credentials",
    "type": "authentication_error",
    "param": null
  }
}

Fields

• code: Machine-readable error code
• message: Human-readable error message
• type: Error category
• param: Parameter that caused the error (if applicable)

Error Types

Authentication Errors (401)

Invalid API Key

{
  "error": {
    "code": "invalid_api_key",
    "message": "Invalid API key provided",
    "type": "authentication_error"
  }
}

Solution: Check your API key is correct and starts with tk-

---

Missing API Key

{
  "error": {
    "code": "missing_api_key",
    "message": "No API key provided",
    "type": "authentication_error"
  }
}

Solution: Include Authorization: Bearer tk-... header

Validation Errors (400)

Invalid Request

{
  "error": {
    "code": "invalid_request",
    "message": "Missing required parameter: messages",
    "type": "invalid_request_error",
    "param": "messages"
  }
}

Solution: Check API documentation for required parameters

---

Invalid Model

{
  "error": {
    "code": "model_not_found",
    "message": "The model 'gpt-5' does not exist",
    "type": "invalid_request_error",
    "param": "model"
  }
}

Solution: Use GET /v1/models to list available models

Rate Limit Errors (429)

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Rate limit exceeded. Please retry after 60 seconds",
    "type": "rate_limit_error"
  }
}

Solution: Implement exponential backoff and respect Retry-After header

Insufficient Balance (402)

{
  "error": {
    "code": "insufficient_balance",
    "message": "Insufficient account balance. Please top up",
    "type": "payment_error"
  }
}

Solution: Add funds at app.tokenlio.ai/billing

Server Errors (500, 502, 503)

{
  "error": {
    "code": "internal_error",
    "message": "An internal error occurred. Please try again",
    "type": "server_error"
  }
}

Solution: Retry with exponential backoff. Contact support if persistent.

Best Practices

Retry Logic

Implement exponential backoff for retryable errors:

import time
from openai import OpenAI, APIError, RateLimitError

client = OpenAI(
    api_key="your-tokenlio-key",
    base_url="https://api.tokenlio.ai/v1"
)

def make_request_with_retry(max_retries=3):
    for attempt in range(max_retries):
        try:
            response = client.chat.completions.create(
                model="gpt-4-turbo",
                messages=[{"role": "user", "content": "Hello"}]
            )
            return response
        
        except RateLimitError:
            if attempt == max_retries - 1:
                raise
            wait_time = 2 ** attempt  # 1s, 2s, 4s
            print(f"Rate limited. Waiting {wait_time}s...")
            time.sleep(wait_time)
        
        except APIError as e:
            if e.status_code >= 500:  # Server errors
                if attempt == max_retries - 1:
                    raise
                wait_time = 2 ** attempt
                print(f"Server error. Retrying in {wait_time}s...")
                time.sleep(wait_time)
            else:
                raise  # Don't retry client errors

Error Logging

Log errors for debugging:

import logging

logger = logging.getLogger(__name__)

try:
    response = client.chat.completions.create(...)
except Exception as e:
    logger.error(f"API request failed: {e}", exc_info=True)
    # Handle error appropriately

User-Friendly Messages

Don't expose raw error messages to end users:

try:
    response = make_api_call()
except RateLimitError:
    return "Service is busy. Please try again in a moment."
except InsufficientBalanceError:
    return "Account credit depleted. Please contact support."
except APIError:
    return "Unable to process request. Please try again later."

Response Headers

Useful headers in error responses:

X-Request-ID: req_abc123xyz
Retry-After: 60
X-RateLimit-Remaining: 0
X-RateLimit-Reset: 1704067200

• X-Request-ID: Include when contacting support
• Retry-After: Seconds to wait before retry
• X-RateLimit-Remaining: Requests remaining in current window
• X-RateLimit-Reset: Unix timestamp when limit resets

Common Issues

SSL Certificate Errors

Error: SSL: CERTIFICATE_VERIFY_FAILED

Solution:

# Ensure you're using https://
client = OpenAI(
    api_key="tk-...",
    base_url="https://api.tokenlio.ai/v1"  # https, not http
)

Timeout Errors

Error: Request timeout after 60s

Solution: Increase timeout for long-running requests:

import httpx

client = OpenAI(
    api_key="tk-...",
    base_url="https://api.tokenlio.ai/v1",
    http_client=httpx.Client(timeout=120.0)  # 120 seconds
)

Connection Errors

Error: Connection refused or Name resolution failed

Solution:

• Check internet connectivity
• Verify firewall/proxy settings
• Check DNS resolution: nslookup api.tokenlio.ai

Getting Help

If errors persist:

1. Check Status Page for outages
2. Review FAQ
3. Contact support with:
   • X-Request-ID from error response
   • Error code and message
   • Timestamp
   • Request details (excluding sensitive data)

Support Email: support@tokenlio.ai

Error Code Reference

Code	HTTP	Retryable	Description
invalid_api_key	401	No	API key is invalid
missing_api_key	401	No	No API key provided
invalid_request	400	No	Invalid parameters
model_not_found	404	No	Model doesn't exist
rate_limit_exceeded	429	Yes	Too many requests
insufficient_balance	402	No	Account balance too low
internal_error	500	Yes	Server error
upstream_error	502	Yes	Provider error
service_unavailable	503	Yes	Temporary unavailability