{"uid":"cap_ATOmf1-bQ_L3MPIShM4lr","slug":"openai-o3-chat-completions-x402-usdc-52e0c9ed","name":"OpenAI o3 Chat Completions (x402/USDC)","description":"o3: OpenAI o3 chat completions, paid per call in USDC. Per 1M tokens in/out: Flex (default) 1.0/4.0, Standard 2.0/8.0, Fast 3.5/14.0; pick with service_tier. Plus $0.0005 (Base) or $0.0005 (Solana) per call; the quote charges input plus 10% of max_tokens. Levels: low, medium, high, xhigh (model o3:<level>). Empty answers are free. Rates: https://openai.mm.family/x402/pricing","url":"https://openai.mm.family/x402/v1/models/o3/chat/completions?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"model":{"enum":["o3","o3:low","o3:medium","o3:high","o3:xhigh"],"type":"string"},"tools":{"type":"array"},"stream":{"type":"boolean"},"messages":{"type":"array","items":{"type":"object","required":["role","content"],"properties":{"role":{"type":"string"},"content":{"type":"string"}}}},"max_tokens":{"type":"integer"},"service_tier":{"enum":["flex","default","standard","auto","fast","priority"],"type":"string"},"response_format":{"type":"object"},"reasoning_effort":{"type":"string"}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-x","model":"o3","usage":{"total_tokens":9,"prompt_tokens":8,"completion_tokens":1},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"Hello","refusal":null},"finish_reason":"stop"}],"service_tier":"flex"}},"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_sAmSF5Fmc3UawOuinQria","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 o3 reasoning model chat completions, billed per call in USDC via x402 micropayment protocol with configurable reasoning effort and service tiers.","exampleAgentPrompt":"Use o3 with high reasoning effort to solve this problem: given a sorted array of integers, write an optimized algorithm in Python to find all pairs that sum to a target value — limit the response to 500 tokens and use the standard service tier.","exampleUseCases":[{"title":"Hard coding problem with deep reasoning","prompt":"I need o3 at the xhigh reasoning level to debug this recursive Rust function that's producing a stack overflow — here's the code. Keep the answer under 1000 tokens and use flex tier to keep costs down."},{"title":"Complex multi-step math derivation","prompt":"Can you use o3:high to walk me through the full derivation of the Euler-Lagrange equation from first principles? I want a thorough explanation, up to 2000 tokens, using the standard service tier."},{"title":"Agentic tool-use reasoning task","prompt":"Run an o3 model completion with medium reasoning effort to decide which of these three investment strategies is most risk-adjusted given the data I'm pasting — keep it under 800 tokens and use fast tier so I get the answer quickly."}],"resultDescription":"Returns a JSON chat completion object containing the assistant's reply message, finish reason (e.g. 'stop'), prompt/completion/total token counts, the model used, and the service tier applied. The response mirrors the OpenAI chat completions API format.","failureModes":["Insufficient USDC balance — payment rejected before inference runs","max_tokens set too high relative to available credit — quota exceeded","Invalid model variant string — enum validation error","Empty response if query is flagged as policy-violating (returned free of charge)","Timeout on very large completions at flex tier due to deprioritized queue","Malformed messages array (missing role or content) — 422 validation error"],"whenToPreferThis":"Choose this endpoint when you need OpenAI's o3 reasoning model specifically — particularly for hard math, coding, logic, or multi-step reasoning tasks — and want to pay per call in USDC via the x402 protocol without a traditional API key subscription. Prefer o3:high or o3:xhigh for maximum reasoning depth, o3:low for speed, and flex tier for cost efficiency. Use over alternatives when you need the full o3 reasoning capability (vs o3-mini) or want crypto-native micropayment billing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T12:42:38.205Z","isFirstParty":false,"canonicalSlug":"openai-o3-chat-completions-x402-usdc-52e0c9ed"}