{"uid":"cap_HepIkJfZp1UluCtgFSYZA","slug":"agentrxi-gpt-oss-120b-chat-completions-3999beee","name":"AgentRXI GPT-OSS 120B Chat Completions","description":"OpenAI-compatible chat completions on OpenAI gpt-oss-120b, the strongest open-weight OpenAI model, reasoning with tool calling. Set your OpenAI SDK base URL to https://agentrxi.com/v1/gpt-oss and pay per token with x402 instead of an API key: $1.05 per million input and $2.25 per million output tokens, minimum $0.002 a call, at most $0.0185. The 402 quotes your request's maximum; \"upto\" payers are charged only the tokens used. Same request/response shape as OpenAI (tool calli","url":"https://agentrxi.com/v1/gpt-oss/chat/completions?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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":{"prompt":{"type":"string","description":"User message"},"system":{"type":"string","description":"Optional system message"},"max_tokens":{"type":"integer"},"temperature":{"type":"number"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"id":"chatcmpl-...","model":"gpt-oss-120b","usage":{"total_tokens":18,"prompt_tokens":14,"completion_tokens":4},"object":"chat.completion","choices":[{"index":0,"message":{"role":"assistant","content":"Bonjour !"},"finish_reason":"stop"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.006629","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":"$0.006629/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006629","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.006629","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_28HXE4Jzf1nuEvokCBPcD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.006629","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Generate chat completions using the GPT-OSS 120B open-source large language model, billed per token with no API key required.","exampleAgentPrompt":"Ask GPT-OSS 120B to translate the phrase 'Good morning, how are you?' into French, keeping the tone casual — use the open-source model and limit it to 50 tokens.","exampleUseCases":[{"title":"Keyless LLM call in agent pipeline","prompt":"I need to call a large open-source language model right now without setting up an account — just send the prompt 'Summarize the following in one sentence: Large language models are trained on vast datasets.' to GPT-OSS 120B and return the result."},{"title":"Crypto-native AI content generation","prompt":"Generate a short professional bio for a software engineer named Alex Rivera using GPT-OSS 120B — pay per call in USDC, no API key needed, and keep the output under 100 tokens."},{"title":"Multi-agent LLM reasoning step","prompt":"In my agent workflow I need a reasoning step — send this prompt to GPT-OSS 120B: 'Given that all mammals are warm-blooded and whales are mammals, are whales warm-blooded?' with a system message saying 'Answer concisely in one sentence' and a temperature of 0.2."}],"resultDescription":"Returns an OpenAI-compatible chat completion JSON object including an assistant message, finish reason, model identifier ('gpt-oss-120b'), and token usage breakdown (prompt tokens, completion tokens, total tokens).","failureModes":["Insufficient USDC balance or failed x402 payment — request rejected before inference","Prompt too long exceeding model context window — may return error or truncated output","Invalid or missing 'prompt' query parameter — API returns validation error","Temperature or max_tokens out of acceptable range — parameter validation failure","Model temporarily unavailable or rate-limited on the AgentRXI marketplace"],"whenToPreferThis":"Choose this endpoint when you need a large open-source chat model (120B parameters) without any signup, API key management, or subscription — especially in agent pipelines that already handle x402 USDC micropayments. Prefer it over managed LLM APIs when anonymity, pay-per-call economics, or avoiding vendor lock-in is a priority.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-15T06:39:23.198Z","isFirstParty":false,"canonicalSlug":"agentrxi-gpt-oss-120b-chat-completions-3999beee"}