{"uid":"cap_XuOvlnzJ4iw27APHuSV0h","slug":"model-access-gateway-llama-3-3-70b-chat-completions-x402-usdc-443fca1c","name":"Model Access Gateway – Llama 3.3 70B 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/llama-3.3-70b?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Optional: fixed by the route (meta-llama/llama-3.3-70b)"},"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":"meta-llama/llama-3.3-70b","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":"0.001","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_I7dJlzXXw-_gqSnOCRLo4","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":"Runs OpenAI-compatible chat completions using Meta's Llama 3.3 70B model, paid per-call in USDC via x402 with no API key or account required.","exampleAgentPrompt":"Ask Llama 3.3 70B to write a concise summary of this customer feedback — pay per call in USDC so I don't need an API key: 'The product arrived late and the packaging was damaged, but the item itself works perfectly.'","exampleUseCases":[{"title":"Anonymous one-off LLM query","prompt":"I need to quickly ask an AI to draft a professional reply to this email without signing up anywhere — just pay a fraction of a cent per call: 'Dear team, we need the Q3 report by Friday.'"},{"title":"Agent tool-calling with Llama 70B","prompt":"Use Llama 3.3 70B to process this user request and call the get_weather tool I've defined — stream the response back as server-sent events and pay in USDC per call."},{"title":"Structured JSON output from open-source LLM","prompt":"Send this product description to Llama 3.3 70B and ask it to return structured JSON with fields for name, price, and category — I want a JSON response_format and up to 512 tokens: 'Blue wireless headphones, noise-cancelling, $79.99, electronics.'"}],"resultDescription":"Returns an OpenAI-compatible chat.completion JSON object containing the assistant's generated message, finish reason (e.g. 'stop'), token usage breakdown (prompt, completion, total), model identifier, and a unique completion ID. Streaming mode returns server-sent events incrementally after payment is confirmed.","failureModes":["Payment failure or insufficient USDC balance — x402 payment rejected, no inference run and automatic refund issued","Model inference error — upstream model fails, automatic refund triggered","Invalid messages array (empty or malformed) — 400 validation error","max_tokens exceeds 16384 — rejected with schema validation error","Network timeout during streaming — partial SSE stream with no explicit error frame","Unsupported response_format schema — model may ignore or return unstructured output"],"whenToPreferThis":"Choose this endpoint when you need Llama 3.3 70B specifically, want a fully OpenAI-compatible interface, need to avoid account registration or API key management, and are comfortable paying per-call in USDC on Base via x402. Ideal for autonomous agents that need permissionless, pay-as-you-go LLM inference with automatic refunds on failure. Prefer this over subscription-based APIs for sporadic or unpredictable workloads, or when building crypto-native agent workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:35:21.315Z","isFirstParty":false,"canonicalSlug":"model-access-gateway-llama-3-3-70b-chat-completions-x402-usdc-443fca1c"}