Review 1 Small Diff Before Spending More

A coding assistant can review a change without turning code review into an open-ended bill. The key is to give it one small diff, ask specific questions, and set a spending limit before you start. This walkthrough uses a $1 budget as an example, not a promise about how many reviews that amount will buy. Actual cost depends on the model, input and output tokens, and provider pricing.

01 / Set a dollar limit before opening the assistant

Choose the maximum you are willing to spend for this review. For a first try, that might be $1. Treat it as a ceiling, not a target. Check the current per-token price for your chosen model and consider both the code you send and the response you receive. Some services also charge for cached token reads and writes.

Pay-as-you-go can suit a tiny budget because you do not have to add a monthly subscription just to try a review. CheapRelay is one option: it offers a single API key for multiple model providers, bills by real token usage, and has no monthly fee or subscription. Read its current pricing before sending code; costs and available models can change.

02 / Pick one change with a clear boundary

Start with a small, complete change: a bug fix, a short function, or a compact pull request. Avoid sending your entire repository. A narrower review generally means less irrelevant context, a clearer answer, and fewer tokens to pay for.

Use your version-control diff to see exactly what changed. Remove unrelated edits, generated files, secrets, and personal data. If the assistant needs surrounding code to understand a change, include only the relevant files or excerpts. Never paste credentials or private customer information into a service unless you have confirmed its data-handling terms.

03 / Ask for defects, not a general opinion

A vague request such as “review this code” can invite a long response that is hard to act on. Tell the assistant what the change is meant to do and ask it to identify concrete risks. For example:

“Review this diff for bugs, security issues, and missing error handling. Report only actionable findings. For each finding, name the affected file and line, explain a realistic failure case, and suggest a fix. If you find none, say so. Do not rewrite the code.”

Add a short description of expected behavior and relevant test results. Ask the assistant not to invent requirements or report style preferences as defects. A review is a second set of suggestions, not proof that the code is correct.

04 / Keep the first pass cheap and useful

Choose a lower-cost model that is suitable for routine review, and check its current price before use. For instance, DeepSeek V4 Flash is among the models offered through CheapRelay; that is not a claim that it will catch every issue or cost a particular amount. Send the diff and prompt once, then read the response before asking follow-up questions.

If the answer is too broad, ask one targeted follow-up about a specific finding. If the change is security-sensitive or the first review misses obvious context, consider a second review with a different model, but only within your original budget. Do not repeatedly resubmit the same code hoping for certainty.

05 / Verify every finding before changing code

Check each claim against the implementation. Reproduce the stated failure where practical, inspect relevant callers, and run the tests that cover the behavior. Reject findings that rely on an assumption your code does not make. Then make only changes you understand, and run the tests again.

For a beginner, the useful receipt is not a dramatic claim about money saved. It is a small, bounded charge, a few specific findings worth checking, and no subscription you did not need. If a pay-as-you-go relay fits your setup, sign up for CheapRelay and review its current prices and terms before sending your first diff.