{"uid":"cap_xj9NZvXpCVMyONNW8OjGw","slug":"low-price-gpt-5-5-x402-api-gateway-long-output-chat-completions-3a1f494d","name":"Low-Price GPT-5.5 x402 API Gateway – Long Output Chat Completions","description":"GET quote and query-parameter variant for the long-output OpenAI-compatible GPT-5.5 chat completion endpoint. Use this for directory health checks, wallets, and simple agent clients that validate x402 payment requirements before issuing a paid call. Market benchmark: the latest local x402.direct sample found AI-like listing prices with p25 around $0.01 and median around $0.03 per call, while this gateway advertises a $0.110876 compact GPT-5.5 entry request, $0.110876 long-output GPT-5.5 requests, and $0.523889 true max-output GPT-5.5 requests. Pay up to $0.110876 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 700000 input characters and 4096 output tokens.","url":"https://gpt55.558686.xyz/v1/chat/completions/long?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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","properties":{"q":{"type":"string"},"input":{"type":"string"},"model":{"enum":["gpt-5.5","gpt-5.4-mini"],"type":"string"},"prompt":{"type":"string"},"system":{"type":"string"},"message":{"type":"string"},"max_tokens":{"type":"integer","maximum":4096,"minimum":1},"system_prompt":{"type":"string"},"max_output_tokens":{"type":"integer","maximum":4096,"minimum":1}},"additionalProperties":true}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["id","object","model","choices"],"properties":{"id":{"type":"string"},"model":{"type":"string"},"usage":{"type":"object"},"object":{"type":"string"},"choices":{"type":"array"}},"additionalProperties":true}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.110876","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":"$0.110876/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.110876","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.110876","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bXe36f54m73Dyv_CmPMNI","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.110876","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Generates long-form GPT-5.5 chat completions via a GET request, paid per-call in USDC over the x402 protocol on Base","exampleAgentPrompt":"Ask GPT-5.5 to write me a detailed, long-form explanation of how transformer attention mechanisms work — use up to 4096 output tokens and set the system prompt to 'You are an expert ML educator.'","exampleUseCases":null,"resultDescription":"Returns an OpenAI-compatible JSON chat completion object including the assistant's generated message content, model name (gpt-5.5), finish reason, completion ID, and token usage breakdown (prompt, completion, and total tokens).","failureModes":["Payment not received or insufficient USDC balance — x402 payment failure, request rejected","Invalid or missing 'input' query parameter — 400 Bad Request","max_tokens or max_output_tokens out of range (must be 1–4096) — validation error","Model enum mismatch (only 'gpt-5.5' accepted) — request rejected","Upstream GPT-5.5 API unavailability — 502 or 503 error from gateway","Rate limiting if too many concurrent calls are attempted from same address"],"whenToPreferThis":"Choose this endpoint when you need long-form GPT-5.5 completions (up to 4096 output tokens) and want to pay per call in USDC via x402 with no subscription required. Prefer this over the compact/short endpoint when you expect verbose answers, detailed explanations, or lengthy generated content. Prefer over official OpenAI API when you need micropayment-native, crypto-native access without API key management.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T00:40:19.176Z","isFirstParty":false,"canonicalSlug":"low-price-gpt-5-5-x402-api-gateway-long-output-chat-completions-3a1f494d"}