Free Tier vs Trial vs Credit: Understanding AI API Pricing

Quick answer: Free Tier is a permanent free quota available until the provider changes its policy. Trial is a limited testing period with fixed time or credit. Free credit is a monetary balance that stops working once exhausted. These differences directly affect project stability.

What is Free Tier?

Free Tier is a quota providers offer permanently (until announced otherwise):

• Fixed RPM/RPD (e.g., 20 requests/minute, 1000/day)
• Fixed token quota (e.g., 50K input tokens/day)
• Base models only (advanced models are paid)

Advantage: Long-term stability. Risk: Provider can change policy, usually with notice.

What is Trial?

Trial is a limited testing period:

• Time-based (e.g., 14 or 30 days free)
• Credit-based (e.g., $5 free credit)
• Feature-based (full access for limited time)

Advantage: Test all features before purchasing. Risk: Service stops after the period ends.

What is Free Credit?

Some services offer monetary credit:

• Signup credit (e.g., $10 on registration)
• Monthly credit (e.g., $5 per month)
• Referral credit

Advantage: Access to all models. Risk: Unpredictable consumption.

Comparison Table

Evaluation Criteria

1. Is the quota real? Some free tiers are too small to be useful
2. Requires credit card? Important for Iranian users
3. Policy change history? How has the provider handled changes before?
4. Iran access? Network, signup, key, and inference checked separately

Summary

For new projects, start with a real Free Tier with sufficient quota. Use Trial only for evaluation. Treat free credit as a bonus, not a foundation.

Checking Your Credit Balance

import os
import requests

# Check remaining credit on a provider
api_key = os.environ["YOUR_API_KEY"]
base_url = "https://api.groq.com/openai/v1"

# Most providers expose usage via a dashboard API
# This example checks available models to confirm access
response = requests.get(
    f"{base_url}/models",
    headers={"Authorization": f"Bearer {api_key}"}
)
if response.status_code == 200:
    models = response.json().get("data", [])
    print(f"Access confirmed: {len(models)} models available")
else:
    print(f"Access issue: {response.status_code}")

Provider Policy Comparison

Evaluation Checklist

1. Is the quota real? Some free tiers are too small to be useful
2. Requires credit card? Important for Iranian users
3. Policy change history? How has the provider handled changes before?
4. Iran access? Network, signup, key, and inference checked separately

For a comprehensive catalog of providers with verified access status, quotas, and pricing details, visit the Free LLM API catalog. For source files and issue reporting, see the GitHub repository.