Testing an AI API from a country where the official card checkout keeps failing

DaoXE, a multi-model AI API gateway, addresses a common pain point for developers in regions like Vietnam, Indonesia, and Turkey where international card checkout often fails. The company provides a practical checklist to separate billing issues from integration problems, emphasizing starting with minimal API calls and verifying protocol compatibility. The approach helps developers confirm their code works correctly before dealing with payment hurdles.

Disclosure and availability:DaoXE is a multi-model, multi-protocol API gateway we operate OpenAI Chat Completions, OpenAI Responses, Anthropic Messages / Claude protocol, and image-generation-compatible endpoints — not OpenAI-only, not Claude-only . It isnotavailable in mainland China. This article is for developers in regions allowed by the service terms. The checklist works for any OpenAI-compatible gateway, not just DaoXE. If you build software from Vietnam, Indonesia, Turkey, or a dozen other places, you know a failure mode that rarely shows up in English tutorials: the model works fine, but the billing page doesn't. An international card gets declined, a region isn't in the dropdown, or a subscription won't activate. The code is not the problem. The checkout is. This post is the practical checklist I use when the goal is "get a real request through," separate from "argue with a payment form." It assumes you route through a gateway that already handles billing in a way you can actually complete, and it focuses on proving the integration is correct. Write them down as two different problems: Most "the API is broken" reports are actually one of these wearing the other's clothes. A gateway that accepts a payment method you can complete solves the first. This checklist solves the second. Do not start inside your app. Start with the smallest possible call. Discover a model first — do not paste a model name from a blog: export DAOXE API KEY="your api key" export DAOXE BASE URL="https://daoxe.com/v1" what can this account actually call? curl --fail-with-body --show-error --silent \ -H "Authorization: Bearer $DAOXE API KEY" \ "$DAOXE BASE URL/models" Then one tiny Chat Completions request keep max tokens small; it may be billed : export DAOXE MODEL="paste exact id from the list" curl --fail-with-body --show-error --silent \ -H "Authorization: Bearer $DAOXE API KEY" \ -H "Content-Type: application/json" \ -d "{\"model\":\"$DAOXE MODEL\",\"max tokens\":8,\"messages\": {\"role\":\"user\",\"content\":\"Reply with OK.\"} }" \ "$DAOXE BASE URL/chat/completions" A multi-protocol gateway can speak more than one dialect. Your client usually speaks exactly one: | Client | Protocol to verify | Path | |---|---|---| | OpenAI SDK, many IDE "OpenAI Compatible" fields | Chat Completions | https://daoxe.com/v1 | | Newer agent stacks | Responses | /v1/responses | | Claude Code, Anthropic SDK, Messages-only tools | Anthropic Messages | /v1/messages | | Image tools | image generation | /v1/images/generations | If you configure the wrong dialect, you get auth or 404 errors that look like a billing problem but are not. Because the whole point is that checkout is painful where you are, do not waste balance during setup: max tokens at 8 during smoke tests /v1/models instead of shipping a stale hardcoded listIf your tool is Claude Code, you point it at the gateway with two environment variables host root, not /v1 : export ANTHROPIC BASE URL="https://daoxe.com" export ANTHROPIC AUTH TOKEN="your api key" claude Full native setup, including the ANTHROPIC AUTH TOKEN vs ANTHROPIC API KEY gotcha, is here: CLAUDE CODE.md https://github.com/seven7763/DaoXE-AI/blob/main/CLAUDE CODE.md . It is a way to stop conflating "I can't complete the checkout" with "the API doesn't work for me." They are different problems and only one of them is in your code.