{"uid":"cap_6I8B0aKWJBhCcEK2D1xiM","slug":"farout-pay-per-call-llm-inference-gpt-5-3-codex-653d0480","name":"FarOut Pay-Per-Call LLM Inference (GPT-5.3-Codex)","description":"Fixed-price chat completions for gpt-5.3-codex on FarOut: flat $0.001 per call (includes up to 4,000 input + 1,000 output tokens). Rate: $0.063/1M input tokens, $0.504/1M output tokens. Pay with USDC on Base using x402. No API key, no account, no prepaid balance.","url":"https://farouter.tech/v1/models/gpt-5.3-codex/chat/completions","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"type":"string","description":"Model id from GET /v1/models, e.g. glm-5.3. No provider prefix."},"stream":{"type":"boolean","description":"SSE streaming."},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"enum":["system","developer","user","assistant","tool"],"type":"string"},"content":{}},"additionalProperties":true},"minItems":1,"description":"Chat messages, [OI]-compatible {role, content}."},"max_tokens":{"type":"integer","minimum":1,"description":"Output token budget. Drives the quote directly."},"temperature":{"type":"number","maximum":2,"minimum":0,"description":"Sampling temperature."},"max_completion_tokens":{"type":"integer","minimum":1,"description":"Alias of max_tokens (gpt-5.x models)."}}},"responseSchema":{"type":"json","example":{"usage":{"prompt_tokens":6,"completion_tokens":8},"choices":[{"message":{"role":"assistant","content":"Hello! How can I help?"},"finish_reason":"stop"}]}},"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_J2uTj-ILXCPHYAoNXL6C9","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 chat completions against GPT-5.3-Codex via a pay-per-call gateway using x402/USDC micropayments — no API key or account required.","exampleAgentPrompt":"Ask GPT-5.3-Codex to write a Python function that parses ISO 8601 timestamps and returns them as UTC datetime objects — pay per call with USDC, no API key needed, cap the output at 512 tokens.","exampleUseCases":[{"title":"Agentic coding assistant on demand","prompt":"Have GPT-5.3-Codex write a TypeScript function that debounces async calls and include inline JSDoc comments — limit the response to 800 tokens and pay per call with USDC so I don't need to set up an account."},{"title":"Autonomous agent reasoning step","prompt":"I need my agent to think through a multi-step plan for scheduling a data pipeline — send the reasoning prompt to GPT-5.3-Codex with temperature 0.2 and a 1024-token budget, paying per call over x402."},{"title":"Zero-setup chat for a prototype app","prompt":"Route this user message to GPT-5.3-Codex and stream the reply back: 'Explain the difference between supervised and reinforcement learning in plain English' — use 300 tokens max and pay with USDC on Base."}],"resultDescription":"Returns an OpenAI-compatible JSON object with a choices array containing the assistant's reply message and finish_reason, plus a usage object showing prompt_tokens and completion_tokens consumed.","failureModes":["Payment rejected if USDC balance on Base is insufficient or x402 handshake fails","Invalid model ID returns 400 or empty model list","messages array missing or empty triggers schema validation error","max_tokens set too low causes truncated or empty responses","Streaming (SSE) misconfiguration can cause client-side parsing errors","Rate limits or upstream model unavailability return 429 or 503"],"whenToPreferThis":"Choose this endpoint when an autonomous agent needs LLM inference without pre-registering API keys or maintaining a prepaid balance — ideal for agent-to-agent workflows, prototyping, or ephemeral tasks where pay-per-call USDC micropayments via x402 are preferable to subscription billing. Best for coding and reasoning workloads where GPT-5.3-Codex specifically is desired.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:34:07.348Z","isFirstParty":false}