Locus x402 Claude Chat API is a paid API for AI agents from anthropic.x402.stage.paywithlocus.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Pay-per-use metered chat completions endpoint proxying Anthropic Claude models (Opus 4, Sonnet 4, Haiku 4) via x402 micropayment protocol
Locus public pay-per-use API
Returns an Anthropic-compatible chat completion response object containing the assistant's reply message, stop reason, usage statistics (input/output tokens billed), and any tool call payloads if tools were invoked. Extended thinking responses include thinking token blocks billed at the output token rate.
POSThttps://anthropic.x402.stage.paywithlocus.com/anthropic/chatChoose this endpoint when you need on-demand, pay-per-call access to Anthropic Claude models without a subscription or prepaid API key — especially in agentic contexts where usage is sporadic or cost must be directly tied to each call. Ideal when your agent runtime supports the x402 micropayment protocol and you want to access Opus-class reasoning or extended thinking without committing to a monthly plan. Prefer this over the direct Anthropic API when you lack API credentials or need USDC-denominated billing.
| Field | Type | Description |
|---|---|---|
| model | string | |
| tools | array | |
| top_k | number | |
| top_p | number | |
| system | — | |
| messages | array | |
| thinking | object | |
| max_tokens | number | |
| temperature | number | |
| tool_choice | object | |
| stop_sequences | array |
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