One AI API key that works across Southeast Asia.

Quick answer: one endpoint, one key, no card to start.

Point any OpenAI SDK or OpenAI-compatible tool at https://api.apisrouter.com/v1 with an APIsRouter key, and every model in the catalog is addressable by its exact id: claude-sonnet-4-6, gpt-5.5, gemini-3.5-flash, deepseek-v4-flash, glm-5.2, and the rest. The key comes from a top-up balance rather than a card on file, and the free start means you can send real requests before paying anything. That shape matters in Southeast Asia for a practical reason: it moves the payment problem from "attach a card that a US biller will accept" to "top up a balance once", and it collapses four vendor accounts into one endpoint. Nothing about your code changes; the OpenAI Chat Completions format is the wire protocol throughout.

curl https://api.apisrouter.com/v1/chat/completions \
  -H "Authorization: Bearer $APISROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-sonnet-4-6",
       "messages":[{"role":"user","content":"ping"}]}'

What the vendors actually support in Southeast Asia.

Worth stating plainly, because outdated posts still claim otherwise: as of July 2026, OpenAI's supported countries list for the API includes Indonesia, Malaysia, the Philippines, Singapore, Thailand, Vietnam, Cambodia, Laos, Brunei, and Myanmar. Anthropic's supported regions list covers the same set with one exception: Myanmar is absent from Anthropic's list. Google's Gemini API is broadly available in the region, including a free tier through AI Studio that needs no card. So for almost every developer in the region, this is not an access problem. Accounts can be created, the terms allow use, and the API consoles work. Both vendors update these lists over time, so check the official pages before making plans, but the direction over the past two years has been expansion, not restriction. The real gap sits one step later, at the payment form. Vendor API billing is prepaid or invoiced in USD against an international card network, and that is exactly the step where locally issued cards fail most often.

Why the hard part is paying, not eligibility.

The pattern in vendor community forums is consistent: "my country is on the supported list, but my card will not attach." The country check passes; the charge fails. A top-up based gateway sidesteps that class of failure entirely, because there is no card on file and no recurring billing relationship, just a balance that draws down per token.

• Cross-border online charges: many banks in the region ship cards with international online payments disabled by default, so the first attempt at a US biller declines until the holder enables it, and some banks never allow it for standard cards.
• BIN and billing-address checks: vendor payment stacks flag mismatches between the card's issuing country and the billing address, a check that fails in confusing ways for developers with regional cards.
• Prepaid cards rejected: OpenAI explicitly does not accept prepaid cards, which removes the most common workaround.
• 3D Secure friction: verification redirects fail on some issuer implementations, and the vendor cannot see why, so the error message is generic.
• Local rails not accepted: MoMo, ZaloPay, and VNPay in Vietnam, PromptPay and TrueMoney in Thailand, GoPay and OVO in Indonesia, GrabPay across the region. None of these attach to a US vendor billing account.

One OpenAI-compatible endpoint for every vendor.

APIsRouter is a gateway: it exposes the standard OpenAI Chat Completions surface at one base URL and routes each request to the upstream vendor that serves the model id. Your application, agent framework, or desktop tool speaks one dialect and addresses Claude, GPT, Gemini, DeepSeek, GLM, Kimi, and Qwen ids through the same key. Every tool that accepts a custom base URL works unchanged: the OpenAI SDKs in Python and TypeScript, coding agents like Cline and Aider, chat apps like Chatbox and LobeChat, and workflow builders like Flowise and n8n. The model field is a plain string, so switching vendors is an id edit rather than a new account, which also means teams across the region can standardize on one integration and let each project pick its own models.

Latency, stated honestly: requests serve from EU and US regions.

APIsRouter runs from cloud regions in the EU and US, not from Singapore or Jakarta. A request from Southeast Asia crosses continents before it reaches the gateway, which adds a real fraction of a second of round-trip time on top of whatever the model itself takes to generate. What that means in practice: for agent loops, coding assistants, batch pipelines, document processing, and model comparison work, the added round trip is small next to generation time, and streaming hides most of it because tokens flow as they are produced. For a latency-critical consumer chat product serving regional users, a vendor's own regional infrastructure will respond faster where you can get billing working; that is the honest trade, and pretending otherwise would cost you exactly one benchmark to discover. If you are unsure which category your workload falls into, measure it: time a streamed request from your actual deployment region and compare time-to-first-token against your requirement before committing either way.

Pay-as-you-go · transparent per-model pricing

Selected models are priced below official list prices. Exact input, output, cache, and per-request prices are shown for each model.

A model mix that fits regional workloads.

All five bill through the same key, and the console breaks usage down per model and per key. The practical workflow for a small team: give each project its own key, let each pick ids freely, and read the per-key usage view at month end instead of reconciling four vendor invoices in four currencies.

• deepseek-v4-flash is the volume model: translation passes, classification, summarization, and high-message chat products where per-token rate dominates the economics.
• glm-5.2 handles bilingual and Chinese-adjacent workloads well, which matters for products serving Chinese-speaking users across Malaysia, Singapore, and the wider region.
• claude-sonnet-4-6 is the dependable default for coding agents and anything where instruction-following quality earns its rate.
• gpt-5.5 is the frontier generalist to A/B against Claude on your own tasks rather than on benchmarks.
• gemini-3.5-flash covers long-context and multimodal work, including image inputs, at a mid-tier rate.

Verify the endpoint and make the first call.

Start with the models listing: it confirms the key works and shows every addressable id, which is the source of truth for the model strings in your requests. Then send one chat completion with the exact id you plan to use. If the first request fails, the failure modes are narrow: a 401 means the key is missing or mistyped, a model-not-found error means the id does not match the catalog listing byte for byte, and a 404 on every request usually means the base URL is missing its /v1 suffix. Once requests flow, the console shows per-request model, token counts, and spend, so the first afternoon of testing also tells you what a month of the workload will cost.

curl -s https://api.apisrouter.com/v1/models \
  -H "Authorization: Bearer $APISROUTER_API_KEY" | head -50

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