{"uid":"cap_OPRFU13h3JbgyRHtIoQHF","slug":"x402engine-longcat-2-llm-api-f70f81da","name":"x402engine Longcat-2 LLM API","description":"108 production APIs behind HTTP 402 micropayments. 72 LLMs, Kling V3 and Hailuo video generation, image generation, code execution, travel search, web scraping, TTS, and transaction simulation. Pay with USDC on Base, USDm on MegaETH, or USDC on Solana.","url":"https://x402engine.app/api/llm/longcat-2","method":"POST","headers":{},"bodySchema":null,"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_IzRjDcvUD2eFBxJbTx9-R","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs inference on the Longcat-2 large language model via a pay-per-call HTTP 402 micropayment endpoint","exampleAgentPrompt":"Use the Longcat-2 model to write me a concise executive summary of the following market research report — pay via USDC on Base for the call: [paste report text here].","exampleUseCases":[{"title":"Crypto-native agent text generation","prompt":"Send this customer support ticket to Longcat-2 and get a draft reply I can review — pay the $0.005 per-call fee in USDC on Base."},{"title":"Pay-per-use LLM for cost control","prompt":"I want to run a one-off prompt through Longcat-2 to brainstorm product names for my new sustainable water bottle brand — just pay microcents per call, no subscription needed."},{"title":"Automated content pipeline with micropayments","prompt":"For each article headline in this list, call Longcat-2 to generate a two-sentence social media blurb, paying per call in USDC on Base."}],"resultDescription":"Returns generated text from the Longcat-2 LLM model as a completion or chat response, typically including the model output and usage metadata such as token counts.","failureModes":["Payment failure if USDC wallet balance is insufficient or the 402 payment header is malformed","Model unavailability or timeout resulting in a 5xx error","Invalid or missing prompt input returning a 400 error","Unsupported content or prompt format causing rejection","Rate limiting if too many concurrent requests are sent"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call access to the Longcat-2 LLM specifically without committing to a subscription, when your agent operates with a crypto wallet on Base/MegaETH/Solana and needs to pay for inference programmatically, or when you want to experiment with Longcat-2 at minimal upfront cost ($0.005 per call).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:44:02.393Z","isFirstParty":false}