How to Migrate an OpenRouter Integration to Another API Gateway

Moving an OpenRouter integration to a different API gateway is not as simple as updating the Base URL in your application configuration. To begin, you must first understand the contract that your application relies on. This includes aspects such as protocol, SDK method, Model ID, response schema, streaming behavior, tool calls, errors, retries, and usage fields.

Once you have a clear understanding of this contract, it's time to test the new gateway using a limited scope. Start with a single API key and a small canary group to ensure the new gateway behaves as expected under controlled conditions.

If the current integration with OpenRouter works without any issues and your application's model catalog or routing behavior are critical, then it may be best to continue using OpenRouter. However, you can still add the new gateway as a backup option without replacing the primary one. Only proceed with a full migration once the candidate gateway passes the same workload-specific checks as the current system.

For this tutorial, BetterToken is used as an example of an alternative gateway. It is important to note that BetterToken is not a clone of OpenRouter, and compatibility with OpenAI models does not ensure identical features or behavior. Before starting the migration process, decide on your migration scenario. You may choose to stay with OpenRouter if your current integration meets all the application's requirements, including billing path, model availability, and operational behavior.

Alternatively, you can add a tested backup gateway if you believe a second route would be beneficial, even if the primary integration does not need to change. Before making any changes, run a migration canary test. This involves confirming that the candidate gateway meets the protocol and model requirements and is ready to handle controlled traffic.

Please keep in mind that BetterToken does not sell OpenRouter accounts or transfer OpenRouter keys or balance. To test BetterToken, you will need to create your own account and obtain an API key. Once you have the current Model ID and key requirements from the OpenRouter Workspace or documentation, you can build a requirements matrix to compare the current behavior and acceptance criteria for each requirement.

Remember, "OpenAI-compatible" only describes part of an interface and not the complete behavior of a service. Different gateways may accept similar requests while still differing in available models, streaming events, tool-call payloads, error bodies, retry headers, rate limits, or usage accounting. It's crucial to record the current behavior and acceptance criteria for each requirement before testing a candidate gateway.

Scenario 1 suggests staying on OpenRouter if there are no concrete benefits to be gained from migrating. While you can still prepare for future portability by moving the Base URL, API key, and Model ID into configuration, documenting consumed response and error fields, and separating provider-specific headers from shared request logic, migration should only be considered when necessary.

Scenario 2 recommends adding a tested backup gateway only after it has passed the same contract tests as the primary route. Keep the configurations of each provider separate, and ensure that the backup route only serves as a fallback for specific failures. Avoid retrying client errors automatically through another provider, as this can interfere with idempotency, retry limits, and timeout budgets.

Fallback should only be applied to transient failures, and you must confirm that the destination state is consistent across both gateways.

Scenario 3 suggests using a canary when the candidate gateway has passed isolated tests and you want to move the primary route. Send a small, controlled segment of non-critical traffic to the new gateway during this initial phase. Continue to keep the current route available until you have observed the results and completed rollback checks.