{"uid":"cap_3A_bDgpPx1N-4-npWIloc","slug":"the-stall-llm-proxy-gpt-4o-mini-via-x402-b8e770fc","name":"The Stall LLM Proxy — GPT-4o-mini via x402","description":"Domain-agnostic x402 capability chassis by IntuiTek¹. 300 AI-callable data services — pay USDC on Base mainnet. No accounts or API keys required.","url":"https://the-stall.intuitek.ai/cap/llm-proxy","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["prompt"],"properties":{"model":{"enum":["gpt-4o-mini"],"type":"string","description":"Model to use. Only gpt-4o-mini is available on this flat-price route."},"prompt":{"type":"string","description":"The user message / task to send to the LLM."},"system":{"type":"string","description":"Optional system prompt. Sets the persona or role for the model."},"max_tokens":{"type":"integer","maximum":2000,"minimum":1,"description":"Maximum output tokens. Default: 500. Increase for longer outputs (max 2,000)."}},"additionalProperties":false}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.021","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":"$0.021/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.021","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.021","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_vmXr2eFULfWTEWvMayerx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.021","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sends a prompt to GPT-4o-mini and returns the model's text response, paid per-call with USDC on Base via x402 — no API key or account required.","exampleAgentPrompt":"Using the pay-per-call LLM proxy on The Stall, send GPT-4o-mini the prompt 'Write a concise product description for a noise-cancelling headphone targeted at remote workers' with the system prompt 'You are a professional copywriter' and allow up to 300 output tokens.","exampleUseCases":[{"title":"Anonymous AI drafting for agents","prompt":"Use the GPT-4o-mini proxy on The Stall to draft a short professional email declining a meeting — system prompt should be 'You are a business communication assistant', max 200 tokens, no API key needed."},{"title":"On-chain agent reasoning step","prompt":"I need my agent to think through a multi-step problem: send the prompt 'List three potential risks of launching a new SaaS product in a saturated market' to the LLM proxy, allow up to 500 tokens, and return the answer."},{"title":"Quick text summarization via micropayment","prompt":"Summarize this paragraph using the pay-per-use GPT-4o-mini service — prompt: 'Summarize in two sentences: Large language models are neural networks trained on vast corpora of text that can generate coherent, contextually relevant responses across a wide range of tasks.' Max 150 tokens."}],"resultDescription":"A plain-text response from GPT-4o-mini containing the model's generated output, up to the requested token limit, returned directly from the endpoint after the x402 USDC micropayment is processed.","failureModes":["Insufficient USDC balance — payment rejected before the model is called","Prompt exceeds context limits — request fails with an input size error","max_tokens set above 2000 — schema validation error","Model unavailable — only gpt-4o-mini is supported on this flat-price route","Network or Base mainnet payment confirmation timeout — call may not complete","Missing required 'prompt' query parameter — request rejected at schema validation"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to invoke GPT-4o-mini for text generation or reasoning without possessing an OpenAI API key or managing a subscription — particularly when operating in a crypto-native, x402-payment context on Base mainnet. Ideal for ephemeral or anonymous agent workflows where spinning up credentials is impractical and micropayment-per-call billing is preferred over monthly plans.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:43:37.414Z","isFirstParty":false}