{"id":"303d62e0-c90a-4c91-8ed8-667d902261d8","shortId":"w7WQXv","kind":"x402","title":"x402-gated premium API access on Base, pay-per-call with USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay-per-call with USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints on the platform, which offers a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Each call is gated by an x402 payment challenge settled in USDC on the Base network.\n\nThe specific resource `/api/v1/generate/resource/71` accepts HTTP POST requests and returns `application/json`. The x402 challenge advertises a maximum cost of 20,000 units of USDC (the on-chain asset at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, which has 6 decimals — so 20,000 raw units equals $0.02). There are no API keys, no rate limits, and no sign-up required; payment is handled entirely via the `X-PAYMENT` header per the x402 protocol.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. The endpoint's actual functionality behind the \"Premium API Access\" label is unclear — the path suggests some kind of generation or resource retrieval, but no input/output schema details, example requests, or response formats are documented. The platform lists similar endpoints at $0.02 each across categories like sentiment analysis, text summarization, geocoding, and more, but this specific resource (71) is not individually described on the landing page.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/71 is undocumented; 'Premium API Access' is a generic label","No input schema or output schema details beyond mimeType application/json","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/71","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it works. However, there is no documentation of what this specific resource does, no input/output schema, no examples, and the docs pages are empty stubs. The actual functionality behind 'Premium API Access' at resource/71 is 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'0.02':140,232 '000':117,136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20':116,135 '6':132 '71':248 'accept':101 'access':6,24,44,200 'across':234 'actual':194 'advertis':111 'ai':73 'analysi':238 'analyt':72 'api':5,16,23,34,43,69,144,176,199 'application/json':107 'asset':125 'base':8,26,95,129 'base network api' 'behind':196 'broad':62 'call':12,30,82 'catalog':63 'categori':235 'chain':124 'challeng':89,110 'connect':184 'content':190 'cost':114 'data':71 'decim':133 'describ':252 'detail':218 'doc':174 'document':169,225 'endpoint':38,55,192,230 'entir':158 'equal':139 'exampl':219 'extrem':171 'financ':76 'format':223 'function':195 'gate':3,21,84 'generat':210 'geocod':241 'handl':157 'header':164 'http':102 'http-post' 'individu':251 'infrastructur':79 'input/output':216 'json-api' 'key':17,35,145 'kind':208 'label':201 'land':255 'learn':75 'like':236 'limit':148 'list':228 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':74 'mani':54 'maximum':113 'micropayment api' 'network':96 'offer':60 'on-chain':122 'one':52 'page':179,256 'path':205 'pay':10,28,66 'pay per call api' 'pay-per-cal':9,27 'pay-per-request':65 'payment':48,88,155,163 'per':11,29,67,165 'platform':58,227 'post':103 'premium':4,22,42,198 'premium api access' 'price':175 'prompt':186 'protocol':49,168 'provid':41 'rate':147 'raw':137 'readm':178 'render':181 'request':68,104,220 'requir':18,36,154 'resourc':99,212,247 'respons':222 'retriev':213 'return':106 'schema':217 'sentiment':237 'settl':90 'sign':152 'sign-up':151 'similar':229 'span':70 'spars':172 'specif':98,246 'suggest':206 'summar':240 'text':239 'unclear':203 'unit':118,138 'usdc':14,32,92,120 'usdc api' 'usdc-base' 'util':80 'via':45,159 'wallet':185 'web3':77 'x':162 'x-payment':161 'x402':2,20,47,87,109,167 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"a0d92379-f4b9-4cff-8b21-3c4d7767ded3","listingId":"303d62e0-c90a-4c91-8ed8-667d902261d8","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:09.903Z"}],"sources":[{"listingId":"303d62e0-c90a-4c91-8ed8-667d902261d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:09.903Z","lastSeenAt":"2026-04-23T02:30:34.972Z"}],"details":{"listingId":"303d62e0-c90a-4c91-8ed8-667d902261d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/71 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 USDC units on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/71"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/71"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generation or resource endpoint without needing API keys","Agent-driven pay-per-call workflows settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, per-request billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-only payment methods","Anyone needing to understand the exact output format before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.464Z"},"updatedAt":"2026-04-23T02:30:34.972Z"}}