{"id":"3a44a98c-857a-4690-98f2-53cf42463a8a","shortId":"AE9qZZ","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/97` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The probe confirms the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20000 base units (USDC has 6 decimals, so this equals $0.02). The payment scheme is \"exact,\" meaning each call requires a one-shot micropayment. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The actual behavior and output of `/api/v1/generate/resource/97` cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["premium API","x402 API","micropayment API","pay-per-call API","lowpaymentfee","USDC API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The exact functionality of /api/v1/generate/resource/97 ('Premium API Access') is completely undocumented","No OpenAPI spec, request schema, or response schema is provided","No usage examples or sample responses available anywhere on the site","The platform lists many endpoints but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/97","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/generate/resource/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what 'Premium API Access' at resource/97 actually does. The docs, API, pricing, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,100,142,205 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20000':132 '402':127 '6':137 'Base network API' 'USDC API' 'access':76 'actual':246 'addit':183 'advertis':182 'ai/ml':59 'analysi':187 'analyt':58 'api':5,22,55,75,158,215 'attach':168 'avail':244,257 'base':8,25,112,133 'base-network' 'behavior':247 'beyond':84 'call':12,29,150 'caller':166 'cannot':252 'challeng':128 'classif':190 'collect':46 'confirm':120 'connect':224 'contract':116 'convers':198 'data':57,62 'decim':138 'detail':231 'determin':254 'doc':214 'document':83,209 'embed':191 'endpoint':6,23,36,92,122,184 'equal':141 'exact':79,147 'exampl':243 'exchang':194 'extrem':211 'feed':193 'finance/web3':61 'function':80 'gate':3,20 'generat':200 'geocod':196 'handl':105 'header':173 'howev':208 'http-post' 'infer':60 'infrastructur':64 'key':159 'label':86 'limit':161 'list':72 'live':124 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':91 'materi':258 'maxamountrequir':130 'mean':148 'micropay':156 'micropayment API' 'network':113 'no-api-key' 'offer':44 'one':89,154 'one-shot':153 'openapi':235 'output':249 'page':219 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':103,144,172,178 'per':11,28,53,101 'platform':42,95,181 'point':207 'premium':4,21,74 'premium API' 'price':97,192,206,216 'probe':119 'prompt':226 'proof':179 'protocol':50,109 'rate':160,195 'readm':218 'render':221 'request':54,102 'request/response':238 'requir':151,165 'resourc':68 'return':125 'schema':239 'scheme':145 'sentiment':186 'shot':155 'simpli':167 'span':56 'spars':212 'spec':236 'specif':67 'subscript':163 'summar':189 'technic':230 'text':188 'uniform':98 'unit':134 'usag':242 'usdc':14,31,115,135 'usdc-micropayment' 'use':114 'util':65 'valid':176,197 'via':106 'wallet':225 'x':171 'x-payment':170 'x402':2,19,49,108,177 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"e2438465-bcf6-4ff4-8629-dc9e775b16c6","listingId":"3a44a98c-857a-4690-98f2-53cf42463a8a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/generate/resource/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:42.907Z"}],"sources":[{"listingId":"3a44a98c-857a-4690-98f2-53cf42463a8a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:42.907Z","lastSeenAt":"2026-04-24T10:32:15.432Z"}],"details":{"listingId":"3a44a98c-857a-4690-98f2-53cf42463a8a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/97"},{"claim":"All endpoints on the platform are priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/97"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless pay-per-request API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request crypto payments add friction","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.978Z"},"updatedAt":"2026-04-24T10:32:15.432Z"}}