Minimum Top-Up for a Weekend Experiment: How Little USDC You Can Start With
For hobbyists looking to experiment with multiple AI models over a weekend, this guide explains how to determine the minimum USDC top-up needed. It covers factors affecting call volume, provides a framework to estimate calls, and advises when larger top-ups are more economical.
Why Start Small?
If you're a solo hobbyist wanting to test a few models over a weekend, you don't need a large balance. The aggregator allows topping up with USDC on Base without KYC, so you can start with a minimal amount and avoid locking up funds you might not use.
How Many Calls Will Your Top-Up Buy?
The number of calls you can make depends on:
- Model pricing: Official rates per token vary widely. Some models are very cheap per call, others cost more.
- Usage per call: Longer prompts and responses consume more tokens.
- Your multiplier: You pay official price × 1.3, so your effective cost per call is 1.3 times the official cost.
To estimate, pick a model, estimate tokens per call (e.g., 500 tokens for a short Q&A), and multiply by the official price per token. Then apply the ×1.3 multiplier. For example, if official cost is $0.001 per call, you'd pay $0.0013.
With a $5 top-up, you could make roughly 3,800 such calls. With $1, about 770 calls. Actual numbers will vary based on your usage.
Practical Minimums
- $1–$2: Enough for a few dozen to a few hundred calls, depending on the model. Good for quick tests of 2–3 models.
- $5: Comfortable for a weekend of experimentation across several models and longer prompts.
- $10+: If you plan to test many models or run longer sessions.
Remember that some models cost more per token, so your call count will be lower with those.
When Topping Up More Saves Fees
Every top-up may incur a network fee (gas) on Base. If you top up frequently in small amounts, those fees add up. To minimize fees:
- Top up once with an amount that covers your expected usage.
- If you're just testing, a single $5 top-up is often more fee-efficient than five $1 top-ups.
- For ongoing use, consider a larger top-up to reduce the number of transactions.
Contributor Credits
If you contribute keys, you earn credits at official price × 1.1 (or × 1.2 for premium models) in USDC. This can offset your costs, but for a weekend experiment, you likely won't need to worry about it.
Getting Started
- Decide which models you want to test.
- Estimate your likely usage per call.
- Calculate the cost per call with the ×1.3 multiplier.
- Choose a top-up amount that covers your estimated calls plus a small buffer.
- Top up once to avoid multiple network fees.
With this approach, you can start experimenting with as little as $1–$2 USDC.