{"uid":"cap_STSxBRCns4jDojyKV_8D-","slug":"gpt-5-5-paid-chat-via-x402-usdc-compact-get-15ee80f4","name":"GPT-5.5 Paid Chat via x402 USDC (Compact GET)","description":"Low-cost OpenAI-compatible GPT-5.5 paid chat over x402 Base USDC. Directory-friendly GET endpoint for compact agent responses, summarization, translation, QA, coding help, and GPT-5.5 chat completions without API-key onboarding. 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 $0.110876 per request with x402 USDC on Base. Exact fixed-price payment and upto token-metered payment are both accepted when clients support them; upto settlements use actual response usage, a 0.0001 minimum, and the selected tier price as the cap. Public paid calls are limited to 700000 input characters and 4096 output tokens.","url":"https://gpt55.558686.xyz/v1/paid/chat","method":"GET","headers":{},"bodySchema":{"type":"object","$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"},"prompt":{"type":"string"},"system":{"type":"string"},"message":{"type":"string"},"max_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_7KFCHMZEMbhw3s2s9N_-L","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":"Provides low-cost OpenAI-compatible GPT-5.5 chat completions via a GET endpoint, paid with USDC on Base via x402 protocol, supporting summarization, translation, QA, and coding help.","exampleAgentPrompt":"Summarize the following article in 3 bullet points using GPT-5.5: 'Quantum computing researchers have achieved a new milestone in error correction, reducing qubit decoherence by 40% using a novel topological approach.' Keep the response under 200 tokens.","exampleUseCases":null,"resultDescription":"Returns an OpenAI-compatible JSON response with an id, model name, choices array containing the generated text, and a usage object showing token counts. The response reflects actual GPT-5.5 output for the given prompt, with billing settled via x402 USDC on Base based on actual usage up to the $0.004 cap.","failureModes":["Insufficient USDC payment: returns 402 Payment Required if x402 payment is missing or below minimum","Prompt too long: returns error if input exceeds 700,000 characters","max_tokens out of range: returns validation error if value is below 1 or above 4096","Model unavailability: upstream GPT-5.5 outage may return 503 or timeout","Malformed query params: missing required 'q', 'prompt', or 'message' field returns 400"],"whenToPreferThis":"Choose this endpoint when you need low-cost, keyless GPT-5.5 completions paid per-use via x402 USDC on Base — ideal for agents that need compact AI responses (summarization, QA, translation, coding) without OpenAI API key onboarding, and where per-call costs under $0.004 are acceptable. Prefer over OpenAI direct when avoiding key management or when integrating micropayment-native AI into autonomous agent workflows.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:55:14.895Z","isFirstParty":false}