Claude Code Setup Guide 2026: Cheap Claude API Access Without a Credit Card

Claude Code is Anthropic's official CLI coding agent, and you don't need a full-price Anthropic subscription or a US credit card to run it. Point two environment variables — ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY — at an OpenAI/Anthropic-compatible relay, and Claude Code works exactly the same, usually at a lower per-token price and with local payment methods accepted.

What Claude Code Actually Needs From an API

Claude Code doesn't hardcode Anthropic's servers. Under the hood it reads two environment variables at startup:

• ANTHROPIC_BASE_URL — the endpoint it sends requests to (defaults to Anthropic's own API)
• ANTHROPIC_API_KEY — the key used for authentication

As long as the endpoint speaks the same request/response shape as Anthropic's Messages API (or is proxied to translate it), Claude Code has no idea — and no way to tell — that it's not talking to Anthropic directly. This is exactly how third-party API relays plug in.

Why "Cheap Claude API Access" Matters More in 2026

Agentic coding tools like Claude Code burn through tokens fast: every tool call, file read, and multi-step plan gets re-sent as context on the next turn. A single refactor session can easily use 500K–2M tokens. At official list prices for a top-tier model, that adds up quickly — and Anthropic's own pricing has been shifting (Sonnet 5's promotional rate is scheduled to expire August 31, 2026, after which input/output costs rise). For solo developers and small teams paying out of pocket, the per-token rate and payment friction (many relays and even Anthropic's own console historically required a US-issued credit card) are real barriers, especially outside the US.

Step-by-Step: Point Claude Code at a Cheaper Relay

The setup is the same on macOS, Linux, and WSL — just export two variables before launching claude:

export ANTHROPIC_BASE_URL="https://api.aisafa.xyz"
export ANTHROPIC_API_KEY="sk-your-relay-key"

claude

To make it permanent, add those two lines to your ~/.zshrc or ~/.bashrc. On Windows (PowerShell):

setx ANTHROPIC_BASE_URL "https://api.aisafa.xyz"
setx ANTHROPIC_API_KEY "sk-your-relay-key"

Restart your terminal, run claude, and check the model actually responds — if you get a 401, double-check the key; if you get a 404, the base URL is missing the correct path prefix for your relay.

Official API vs. a Third-Party Relay: What Actually Changes

Common Setup Problems (and Fixes)

A few issues account for most support requests when switching Claude Code to a third-party endpoint:

• 401 Unauthorized — the key format doesn't match what the relay expects, or it wasn't exported in the same shell session that launches claude.
• Model not found — some relays require you to reference their own model alias (e.g. claude-opus-4-8) rather than Anthropic's exact internal name; check the relay's docs.
• Requests silently falling back to a weaker model — a small number of budget relays quietly downgrade under load. Test with a task you know the difference on (e.g. a moderately hard refactor) to confirm you're getting the model you paid for.
• No prompt caching savings showing up — if your relay doesn't pass through Anthropic's cache-read discount, long system prompts and repeated file context cost full price every turn, which erases most of the savings agentic coding is supposed to get from caching.

This last point is where the choice of relay matters most for anyone running Claude Code all day. Safa API is built specifically to avoid the two failure modes above: it proxies straight to the official Claude models (no quiet downgrading), and it passes through prompt cache discounts instead of eating them, which is exactly the workload pattern Claude Code produces — the same system prompt and file context reused turn after turn. Pricing sits below Anthropic's list rate, sign-up doesn't require a credit card, and Alipay is accepted directly, which removes the US-card requirement that blocks a lot of developers outside the US from ever getting an official key in the first place.

The other practical benefit: Safa API exposes Claude, GPT, and Gemini behind one endpoint and one key. If you also use GPT-5.5 or Gemini 3 Pro for other tools (Cursor, a chatbot, a batch pipeline), you don't need three separate accounts, three billing dashboards, and three sets of API keys — you just change the model name in the request and keep the same ANTHROPIC_BASE_URL-style config for Claude Code, plus an OpenAI-compatible endpoint for anything else.

常见问题

Do I need a US credit card to use Claude Code with a relay?

No. That's specifically what a relay solves — you authenticate with an API key from the relay, and payment goes through whatever methods the relay supports (Alipay, WeChat Pay, or card, depending on provider), not Anthropic's own billing.

Will switching the API endpoint break any Claude Code features?

No, as long as the relay correctly implements Anthropic's Messages API format, including streaming and tool use. Claude Code only cares about the response shape, not which server produced it.

Is a cheaper relay actually the same Claude model, or a downgraded version?

It depends on the provider. Reputable relays proxy directly to Anthropic's official models with no modification — always test with a task where model quality is obvious, and be wary of any relay that won't tell you which underlying model version you're calling.