Anthropic Pay Per Use

Anthropic's Claude models are among the most capable LLMs available, particularly for long-context tasks, nuanced reasoning, and code generation. But accessing them directly requires an Anthropic account, credit card on file, and managing yet another set of API keys and billing. With Locus, you call Claude models through a unified API and pay per call from your USDC wallet. No Anthropic account needed. The API format is compatible with Anthropic's messages API, so integration is straightforward — change the base URL, use your Locus API key, and start calling Claude immediately.

Claude models have several properties that make them particularly well-suited for autonomous AI agents:

• •Long context — Reviewed Claude models support long documents, extended conversations, and large code inputs. The model catalog publishes the exact context and output limits.
• •Strong tool use — Claude excels at structured function calling, which agents rely on to interact with APIs, databases, and external services.
• •Reliable instruction following — Agents need models that consistently follow system prompts and constraints. Claude's strong adherence to instructions reduces the risk of off-script behavior.
• •Safety-oriented — Built-in safety training helps prevent agents from taking harmful actions, adding an extra layer of protection alongside Locus's spending controls.

The real power of using Claude through Locus is combining it with other APIs seamlessly. Use Claude for reasoning and planning, then call Tavily for web search, DeepSeek for cost-efficient code generation, and Stability AI for image creation — all from the same wallet with one API key. Many agent developers use Claude as their primary "brain" model while routing simpler subtasks to cheaper providers, optimizing both quality and cost.