Clink Lithium Vault – Keyless Claude API (LLM Chat)

x402

Clink Lithium Vault – Keyless Claude API (LLM Chat) is a paid API for AI agents from clink-lithium-vault.fly.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-10).

Proxies Anthropic Claude (Haiku 4.5, Sonnet 5, Opus 5) chat completions with tool-calling support, billed per token via x402 micropayments — no API key required.

Price / call$0.25

Seller volume →—

Success—

StatusUnknown

How this service works

Claude API for AI agents, pay per token, no API key or account - POST an Anthropic Messages request (messages, system, tools, tool_choice, thinking) and get the full response back. Claude Opus 5, Sonnet 5, Haiku 4.5. Tool calling / function calling supported. Billed on actual usage at list price + 25%, capped at $0.25 per call (x402 upto scheme). LLM inference, chat completions, keyless Claude, Anthropic proxy. Free price sheet: /llm/models.

Output

Returns a full Anthropic Messages API response object: content array with text or tool_use blocks, stop_reason (e.g. end_turn or tool_use), and usage object containing input_tokens and output_tokens.

Example use cases

Keyless Claude reasoning for agent pipeline

“I need Claude Sonnet 5 to analyze this customer complaint and suggest a resolution — I don't have an Anthropic API key, just bill me per token. System prompt: 'You are a helpful customer support agent.' Message: 'My order arrived damaged and support hasn't responded in a week.'”

Tool-calling agent without Anthropic account

“Call Claude Haiku 4.5 with a weather tool definition — function name get_weather, params location and unit — and a user message asking 'What's the weather in Tokyo?' Return the tool call result so I can invoke the function.”

One-off Opus reasoning task

“Use Claude Opus 5 to think through the pros and cons of switching our startup from PostgreSQL to MongoDB, max 2048 tokens. I don't want to set up an Anthropic account just for this one task.”

Technical details

Endpoint

POSThttps://clink-lithium-vault.fly.dev/llm/chat?utm_source=zero.xyz

When to prefer

Choose this endpoint when an AI agent needs Claude inference (including tool calling and system prompts) without managing Anthropic API credentials or subscriptions. Ideal for ephemeral agent tasks, multi-agent pipelines billed per call, or situations where setting up an Anthropic account is impractical. The $0.25-per-call cap makes it predictable for budget-conscious agents. Prefer a direct Anthropic API key if you need bulk throughput, fine-grained rate limits, or sub-list pricing.

Side effects

Payment not included or insufficient — x402 payment required before response is returned
Model enum not recognized — must use exact values like 'sonnet', 'claude-sonnet-5', 'haiku', etc.
messages array missing or first role is not 'user' — API rejects malformed message arrays
max_tokens out of range (must be 1–4096) — defaults to 1024 if omitted
Anthropic upstream timeout or rate limit — proxy may return 5xx error
Call cost exceeds $0.25 cap — very long conversations may be refused or truncated

Input

Schema · Request body

Field	Type	Description
model	string
tools	array	Optional tool definitions (Anthropic tool-use schema)
system	string	Optional system prompt
messages	array	Anthropic Messages API messages array; first role must be user
max_tokens	integer	1-4096, default 1024

Output

Schema · Response

{
  "type": "json",
  "example": {
    "usage": {
      "input_tokens": 12,
      "output_tokens": 8
    },
    "content": [
      {
        "text": "Hi there, nice to meet you!",
        "type": "text"
      }
    ],
    "stop_reason": "end_turn"
  }
}

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