A Google Serper alternative should be evaluated as a migration contract, not as a list of cheaper brand names. Identify the fields and behavior the application actually uses, then test that contract against the replacement. A navigational search for Serper is different from a request to compare alternatives.
Map the native fields before changing providers
| Provider contract | Organic result location | Link field |
|---|---|---|
| Serper documented examples | organic | link |
| SerpApi Google Search | organic_results | link |
| SearchCans | data.organic | link |
This table concerns the organic-result contract. Authentication, request parameters, localization, pagination, error handling and optional features still need their own mappings. Do not rename a response array and assume the migration is complete.
Use an application-owned acceptance set
A provider homepage is evidence for its published contract or offer, not an independent performance test. Keep dated links to the official documentation and report anything that was not tested. This guide does not invent a switching customer story or declare an unmeasured provider winner.
- Freeze the queries, markets and desired depth used by the current application.
- Keep a successful envelope, a valid empty result and an error case for each provider.
- Test downstream parsing and host matching against the replacement envelope.
- If source content is required, test selected-page extraction separately from the SERP response.
- Compare the current billing unit, required first payment, usage deadline and allowed capacity.
Keep a reversible migration record
Save the old request and normalized output alongside the proposed adapter. Release the adapter behind an application-controlled selection and retain the raw response during validation. If fields needed by the application are missing, classify the migration as incomplete rather than filling them with guessed values.
For one brand-pair retrieval comparison, use the dedicated contract guide. For full-workflow cost, use the cost worksheet. Those are separate decisions from the Serper migration contract.
Reference documentation: serper.dev — ; serpapi.com — /search-api; www.searchcans.com — /google-search-api.
