{"uid":"cap_FDivv_5vikJlictgiilAt","slug":"clinkagent-keyless-claude-api-75638f46","name":"ClinkAgent Keyless Claude API","description":"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.","url":"https://clinkagent.com/llm/chat?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"enum":["haiku","sonnet","opus","fable","claude-haiku-4-5","claude-sonnet-5-5","claude-opus-5-5","claude-fable-5-1"],"type":"string"},"tools":{"type":"array","description":"Optional tool definitions (Anthropic tool-use schema)"},"system":{"type":"string","description":"Optional system prompt"},"messages":{"type":"array","description":"Anthropic Messages API messages array; first role must be user"},"max_tokens":{"type":"integer","description":"1-4096, default 1024"}}},"responseSchema":{"type":"json","example":{"usage":{"input_tokens":12,"output_tokens":8},"content":[{"text":"Hi there, nice to meet you!","type":"text"}],"stop_reason":"end_turn"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.25","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.25/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.25","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_t9PbLhLFX19kCvXMTDWh8","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.25","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxy endpoint for Anthropic Claude models (Haiku, Sonnet, Opus) — accepts standard Anthropic Messages API requests without requiring an API key, billing per token via x402 micropayments","exampleAgentPrompt":"Send this conversation to Claude Sonnet 5 — system prompt is 'You are a helpful assistant', user message is 'Explain quantum entanglement in two sentences', max 300 tokens — no API key needed, just pay per token.","exampleUseCases":[{"title":"Agentic tool-calling without API keys","prompt":"Call Claude Sonnet 5 with this system prompt 'You are a travel planner' and these messages, and give it a tool definition for searching flights — I don't have an Anthropic key, just bill me per token."},{"title":"Quick one-off LLM inference for a script","prompt":"I need to run a single Claude Haiku call to classify this customer feedback text — max 200 tokens, no account setup, just charge me for what I use."},{"title":"Agentic reasoning with extended thinking","prompt":"Use Claude Opus 5 with thinking enabled to reason through this multi-step math problem in my agent pipeline — pass these messages and give me the full response back, billed per token."}],"resultDescription":"Full Anthropic Messages API response object including the assistant's message content, stop reason, tool use blocks if tools were invoked, and token usage counts (input and output tokens consumed).","failureModes":["Insufficient USDC balance for x402 payment — payment required error returned","Invalid model enum value — request rejected with validation error","messages array missing or first role not 'user' — Anthropic API validation error","max_tokens exceeds 4096 — capped or rejected","Tool definition schema malformed — Anthropic tool-use error propagated","Request cost exceeds $0.25 cap — call may be rejected or truncated"],"whenToPreferThis":"Choose this endpoint when your agent needs to call Claude (Haiku, Sonnet, or Opus) without managing an Anthropic API key or account, especially in agentic or serverless contexts where x402 micropayment billing is preferred. Ideal for one-off inference calls, agent pipelines that need tool/function calling support, or developers who want pay-as-you-go access at list price + 25% without a subscription commitment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T12:30:43.429Z","isFirstParty":false,"canonicalSlug":"clinkagent-keyless-claude-api-75638f46"}