{"uid":"cap_kafYIvyMMqLyERGfZzg1s","slug":"model-access-gateway-gpt-6-1-sol-chat-completions-x402-usdc-5801caac","name":"Model Access Gateway – GPT-6.1-Sol Chat Completions (x402, USDC)","description":"LLM inference API: OpenAI-compatible chat completions for 136 AI models (Claude, GPT, Gemini, Grok, DeepSeek, Qwen, Kimi, GLM), paid per call in USDC on Base with x402. No account, no API key, automatic refund if the model fails.","url":"https://modelaccessgateway.com/llm/gpt-6.1-sol?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Optional: fixed by the route (openai/gpt-6.1-sol)"},"tools":{"type":"array"},"stream":{"type":"boolean","description":"true: server-sent events after payment"},"messages":{"type":"array","items":{"type":"object","required":["role"],"properties":{"role":{"enum":["system","user","assistant","tool","developer"],"type":"string"},"content":{"type":["string","array","null"]}}},"minItems":1},"max_tokens":{"type":"integer","maximum":16384,"minimum":1,"description":"Optional, default 4096"},"temperature":{"type":"number","maximum":2,"minimum":0},"response_format":{"type":"object"}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-7f3c2a91","model":"openai/gpt-6.1-sol","usage":{"total_tokens":10,"prompt_tokens":9,"completion_tokens":1},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"OK"},"finish_reason":"stop"}],"created":1791979200}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0014","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":"$0.0014/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0014","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0014","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_q-uh3fiBKASqpUX2VojKG","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0014","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs OpenAI-compatible chat completions using the GPT-6.1-Sol model, billed per-call in USDC on Base via x402 with no API key required.","exampleAgentPrompt":"Ask GPT-6.1-Sol: 'Summarize the pros and cons of solar energy in 3 bullet points' — pay per call in USDC, no API key, up to 512 tokens, temperature 0.7.","exampleUseCases":[{"title":"Keyless AI assistant for autonomous agent","prompt":"I'm building an AI agent that needs to call an LLM on-the-fly without holding any API keys — can you send the message 'You are a helpful assistant. What is the capital of France?' to GPT-6.1-Sol, paying in USDC per call, and give me back the reply?"},{"title":"Structured JSON output from LLM","prompt":"Send this prompt to GPT-6.1-Sol and make it return a JSON object with fields 'summary' and 'sentiment': 'Analyze this review: the onboarding was smooth but the pricing felt opaque.' Use response_format JSON mode and keep it under 300 tokens."},{"title":"Streaming AI response for chat UI","prompt":"I want to stream a GPT-6.1-Sol response word by word to my chat interface — send the message 'Write a short poem about autumn leaves' with streaming enabled, temperature 0.9, max 200 tokens, and pay in USDC via x402."}],"resultDescription":"Returns an OpenAI-compatible chat.completion JSON object containing the assistant's reply message, finish reason (stop, length, tool_calls, etc.), prompt and completion token counts, model identifier, and a unique completion ID. Streaming mode delivers the same content as server-sent events.","failureModes":["Insufficient USDC balance triggers 402 Payment Required with no charge","Model unavailable or overloaded returns error with automatic refund","Invalid messages array (missing role or empty array) returns 400 validation error","max_tokens exceeds 16384 causes schema validation rejection","Malformed JSON body returns parse error","Network timeout may leave payment state ambiguous — gateway guarantees refund on failure"],"whenToPreferThis":"Choose this endpoint when you need OpenAI-compatible LLM inference with zero account setup, want pay-per-call billing in USDC (no subscription), need automatic refunds on model failure, or are building an autonomous agent that must self-fund inference. Prefer over direct OpenAI API when operating without stored API keys or when using x402 micropayment flows on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:47:40.369Z","isFirstParty":false,"canonicalSlug":"model-access-gateway-gpt-6-1-sol-chat-completions-x402-usdc-5801caac"}