{"uid":"cap_5d4yXTIIX4d33F3rtgSck","slug":"linkrra-pearl-pool-chat-completions-e27aec76","name":"Linkrra Pearl Pool Chat Completions","description":"OpenAI-compatible inference paid per request in USDC on Base (eip155:8453, scheme exact). GET /v1/models for the model catalogue and per-model USD prices. Every paid route answers unauthenticated requests with an x402 v2 402 challenge (PAYMENT-REQUIRED header + JSON body). Minimum charge $0.01 per paid call on chat/completions and tts (usage-based price applies above it); credit top-ups are $1 minimum. Contact: weare@linkrra.com Pay-per-call needs no account and no API key: POST /v1/chat/completions with no Authorization header returns the x402 402 challenge and accepts payment in place.","url":"https://pool.linkrra.com/v1/chat/completions?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"enum":["auto","qwen/qwen3-vl-30b-a3b-instruct","qwen/qwen3-30b-a3b","qwen3-coder-30b","gpt-oss-20b","gemma-4-26b-a4b-it"],"type":"string","description":"\"auto\" = cheapest of our self-hosted models that fits, or name one."},"stream":{"type":"boolean","default":false,"description":"true = stream OpenAI-format Server-Sent Events."},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","user","assistant","tool"],"type":"string"},"content":{"description":"Text, or an array of OpenAI content parts."}}},"examples":[[{"role":"user","content":"Write a Python function that reverses a string"}]],"minItems":1,"description":"OpenAI-format chat history, oldest first: [{role, content}]."},"max_tokens":{"type":"integer","default":4096,"maximum":4096,"minimum":1,"description":"Completion token cap. The price is quoted for the prompt plus this cap."}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-...","usage":{"total_tokens":0,"prompt_tokens":0,"completion_tokens":0},"object":"chat.completion","choices":[{"message":{"role":"assistant","content":"..."}}],"payment":{"network":"eip155:8453","paidUsd":0,"transaction":"0x..."}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2tP-ImCBfqMHm_v8KuYYd","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"OpenAI-compatible chat completions paid per request in USDC on Base via x402, requiring no API key or account","exampleAgentPrompt":"Without signing up for anything, send this message to an AI model and pay per call using USDC on Base: 'Summarize the pros and cons of electric vehicles in three bullet points.'","exampleUseCases":[{"title":"Anonymous one-off LLM query","prompt":"I need to ask an AI to draft a short product description for my new notebook app, but I don't want to create any accounts — just pay a tiny amount in USDC and get the answer back."},{"title":"Agent pipeline with crypto micropayments","prompt":"My automation bot needs to classify customer support tickets by urgency using an LLM, paying a fraction of a cent per classification in USDC on Base with no recurring subscription."},{"title":"Developer prototyping without API key","prompt":"I'm testing a new chatbot idea and want to call an OpenAI-compatible endpoint to get a response to 'What is the capital of France?' — no API key, just pay with USDC on Base."}],"resultDescription":"Returns a standard OpenAI-style chat completion JSON object including an id, choices array with the assistant message and content, token usage breakdown (prompt, completion, total tokens), and a payment sub-object confirming the network (eip155:8453), amount paid in USD, and on-chain transaction hash.","failureModes":["402 Payment Required if no valid x402 payment is attached — returns PAYMENT-REQUIRED header and JSON challenge body","Request below $0.01 minimum charge may be rounded up to minimum","Invalid or expired payment transaction rejected","Malformed JSON body returns 400 Bad Request","Network congestion on Base may delay payment confirmation","Model not found if requested model is not in catalogue"],"whenToPreferThis":"Choose this endpoint when you need OpenAI-compatible chat completions with zero account setup, preferring crypto (USDC on Base) micropayment via x402 over subscription billing. Ideal for agents, bots, or scripts that need anonymous, pay-as-you-go LLM inference at $0.001–$0.01 per call without managing API keys or monthly plans.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-28T12:31:04.755Z","isFirstParty":false,"canonicalSlug":"linkrra-pearl-pool-chat-completions-e27aec76"}