What is Zerouter?
Zerouter presents one API gateway for models from providers including Anthropic, OpenAI, Google, xAI and Moonshot, alongside additional compatible API channels shown in its catalogue. Its public docs describe one platform key and a shared balance, while the model catalogue lists the model IDs, supported routes and current rates.
There is an important distinction between a gateway and the model companies themselves. Zerouter's Terms describe the service as a two-sided marketplace that routes eligible requests through provider-authorized resources. Zerouter is not Anthropic, OpenAI, Google, xAI or Moonshot, and its Terms do not promise that a particular model, region or upstream resource will always remain available. Treat its routing and no-substitution statements as provider claims, not as an independent audit.
How the API setup works
The gateway origin in Zerouter's current quickstart is https://api.zerouter.ai. A single key does not mean every model uses the same request path: the provider currently lists different protocol routes for different model families.
- Claude and Kimi:
POST /v1/messages. - GPT and Grok:
POST /v1/responses. - Gemini and compatible chat APIs:
POST /v1/chat/completions.
For an OpenAI SDK client, Zerouter's quickstart uses https://api.zerouter.ai/v1 as the base URL. Other clients may need a provider-specific base URL or authentication variable. Choose the exact model ID from the live catalogue and follow the matching documentation rather than assuming that one SDK method or endpoint works for every model.
- Create a platform key only after reviewing the current Terms, privacy information and recharge rules.
- Store the key in a server-side environment variable or secret manager. Never place it in public JavaScript, source control, screenshots or support messages.
- Choose a model and confirm its endpoint, request format, price and any upstream limitations.
- Send one small, non-sensitive test request. Check the model recorded, usage ledger, response and charge before increasing volume or enabling automatic retries.
Pricing: usage-based, but funded in advance
Zerouter's pricing page and FAQ describe per-token billing with no monthly subscription fee. Input, output and cached-input rates can differ by model, and the live catalogue may change. The provider says its pricing snapshots are recorded with requests; check the current rate for the exact model before sending traffic rather than relying on a saved comparison or a headline savings claim.
Do not confuse usage-based billing with postpaid billing. Zerouter's Terms say callers fund a prepaid balance, and the current Terms state that purchases are final and refunds are not issued. Recharge methods and minimums may vary. Start only with an amount you are prepared to spend, verify how usage appears in the ledger, and do not top up until the integration behaves as expected.
Data, credentials and upstream providers
Zerouter's Privacy Policy says the service records account and security information, plus API-usage metadata such as the model ID, token counts, cache reads, route outcome and price snapshot. It also says the request you authorize is sent to the upstream model provider that handles that call. That means prompts or other request content may be processed under the upstream provider's terms as well as Zerouter's policies.
The same policy says provider credentials are encrypted and held in a vault, and that callers receive a Zerouter API key rather than upstream credentials. These are statements in the provider's own policy, not an independent security assessment or a guarantee about a particular integration. Before production use, review the live privacy policy, upstream terms, retention and processing details, and the consequences of an account or upstream-provider restriction.
- Do not send confidential, personal, customer or regulated data until you have checked the data path and applicable terms.
- Keep API keys server-side, restrict access, monitor usage, and rotate a key if it may have been exposed.
- Check the returned model and usage ledger after errors or timeouts before retrying; a retry can create another request.
- Read Zerouter's current age and territory eligibility rules and the acceptable-use terms before signing up.
Who might find it useful?
Zerouter may be worth evaluating for developers who want one gateway and balance for several supported model APIs, especially when their client allows a custom base URL. It may be a poor fit for workloads that require a direct provider contract, guaranteed capacity or region, a specific service-level commitment, or terms that permit refunds after a failed purchase or upstream restriction.
For a fair comparison, test the same small workload against Zerouter and a direct provider route. Match the model and settings, measure output quality and latency, include input/output/cache costs, review failures and retry behavior, and compare the data and support terms. Do not treat advertised savings or protocol compatibility as proof that the full service is equivalent for your use case.
Frequently asked questions
Does one Zerouter key work with every model?
Zerouter says one platform key covers its supported models. The correct API path and request format still vary by model family, so confirm the live catalogue and documentation.
Is there a monthly subscription?
The public pricing page and FAQ currently say there is no monthly subscription fee and that usage is billed by tokens. The Terms also say callers fund a prepaid balance.
Can prepaid credits be refunded?
Zerouter's Terms state that purchases are final and that refunds are not issued. Read the current Terms before adding funds; do not assume unused or failed-call credits can be returned.
Does the invitation link guarantee a discount?
No discount or referrer reward was visible on the sign-in page when checked on 27 October 2026. The URL includes the invitation parameter supplied for this guide, but any offer and eligibility must be confirmed directly with Zerouter.
Is Zerouter an official API from the model providers?
No. Zerouter's Terms say it is a separate marketplace and is not Anthropic, OpenAI, Google, xAI or Moonshot. Its Terms also say upstream model or resource availability can change.
Explore Zerouter
Review the live model catalogue, setup guide, pricing and terms. Confirm the referral-page details and prepaid-credit rules before creating a key or funding a balance.
Open the supplied Zerouter link →