https://gtokens.io/blog/ Guides for calling frontier models through one gateway. en Sun, 01 Nov 2026 00:00:00 GMT https://gtokens.io/blog/api-key-spend-limits/ https://gtokens.io/blog/api-key-spend-limits/ Tue, 27 Oct 2026 00:00:00 GMT API Give each API key its own spending ceiling and reset period, read what is left from GET /api/v1/key, and stop a batch before it runs into a 402. https://gtokens.io/blog/retry-429-503-retry-after/ https://gtokens.io/blog/retry-429-503-retry-after/ Fri, 23 Oct 2026 00:00:00 GMT API What 429 and 503 ask of your client: read Retry-After, back off with jitter, cap the attempts, and know which errors are never worth retrying. https://gtokens.io/blog/image-generation-exact-size-aspect-ratio/ https://gtokens.io/blog/image-generation-exact-size-aspect-ratio/ Tue, 20 Oct 2026 00:00:00 GMT Guides Ask for exact pixels or a tier and an aspect ratio: what size comes back, where the fields go, what is refused with 400 and what sets the price. https://gtokens.io/blog/custom-base-url-coding-agents/ https://gtokens.io/blog/custom-base-url-coding-agents/ Tue, 13 Oct 2026 00:00:00 GMT Guides Two environment variables move a terminal coding agent onto a gateway: the base URL and a bearer token. What to set, how to check it, and what stops the first call. https://gtokens.io/blog/llm-request-cost-usage-cost/ https://gtokens.io/blog/llm-request-cost-usage-cost/ Tue, 06 Oct 2026 00:00:00 GMT API Every chat completion reports what it charged in usage.cost. Find it in a reply and a stream, log it per request and check the sums against the key route. https://gtokens.io/blog/messages-api-custom-base-url/ https://gtokens.io/blog/messages-api-custom-base-url/ Tue, 29 Sep 2026 00:00:00 GMT Guides Point the Messages API client libraries at a different endpoint: the base URL, an auth token instead of an API key, streaming, token usage and typed errors. https://gtokens.io/blog/http-402-payment-required/ https://gtokens.io/blog/http-402-payment-required/ Wed, 23 Sep 2026 00:00:00 GMT API Why an API call comes back 402 payment_required: the prepaid balance, a key spend limit or an account ceiling. How to tell which, and what to do. https://gtokens.io/blog/openai-sdk-custom-base-url/ https://gtokens.io/blog/openai-sdk-custom-base-url/ Tue, 15 Sep 2026 00:00:00 GMT Guides Change base_url and api_key in the OpenAI client library and keep the rest of the code: chat completions, streaming, tool calls and image generation at exact sizes.