Terms of use

Sylphx AI is provided by Sylphx Limited and sells access to a catalog of models through one HTTP API that speaks the official OpenAI Responses document, plus a product site with documentation, the catalog, and pricing. Accounts and API keys are managed in the Sylphx console. The machine-readable customer contract is published as the OpenAPI document; where the contract and this page disagree about the wire, the contract wins.

• Authenticate with a Sylphx API key prefixed sylphx_sk_ against https://api.sylphx.ai/v1.
• Each request names one model that is listed in the catalog at the time of the request. Listed models and their prices can change; the catalog is the current set.
• Usage is metered per token on Responses and charged at the published list prices.

• Keep your keys secret and rotate them if they leak. Calls made with a key are treated as your calls. You can revoke any key from the Sylphx console.
• You are responsible for the accounts you create and for who can use your workspace.
• Do not resell, sublicense, or expose the API in a way that hides the responsible account: unlimited shared keys, or a relay that strips metering and abuse controls, are not permitted.

• You must have the rights to everything you send, and to any content a hosted tool fetches for you.
• Do not use the service to break the law, to attack this or another service, or to process data you are not allowed to process.
• Each catalog model publishes its training posture and whether zero-data-retention is available, so you can choose a model that fits your own obligations. Details are on each model page and in the privacy notice.

• Do not circumvent authentication, metering, rate limits, or the catalog: probing for unlisted models, forging usage, or sharing a binding from another Sylphx product to skip AI metering are all prohibited.
• Do not present another product’s credentials, or another service’s API, as Sylphx Models.
• We may refuse a request, rate-limit a key, or suspend a workspace that threatens the service, other customers, or metering integrity. Where practical we tell you why and what to change.

• Prices are the list prices published on the pricing page for the model you call. The Sylphx console reports the requests, tokens, and settled spend those prices produced.
• A retried request sent with an Idempotency-Key replays the original response rather than charging a second time. A request that fails validation or returns an error status does not produce a completed response to bill.
• If you believe a charge is wrong, contact hi@sylphx.ai with the response ids and we will reconcile it against the meter.

• A healthy product site is not a promise about the API. Availability of individual models follows the catalog; we may add, pause, or retire a model, and we publish what is listed at any moment.
• We may change these terms. Material changes are reflected by the “last updated” date on this page, and continued use after a change means you accept it.
• Security reports: security@sylphx.ai. Please do not include customer content or secrets in a first report.

Questions about these terms, an account, or a bill: hi@sylphx.ai. Product questions are usually answered faster in the docs.