{"id":"32056a8b-40a7-48d9-b9e9-9369fe2b0cbb","shortId":"yafQUc","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/endpoint-43` is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are advertised; callers pay per request using an X-PAYMENT header.\n\nThe broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/endpoint-43` does not correspond to any of the named endpoints on the site's landing page. Its exact functionality is undocumented — the description simply says \"Premium API Access\" with no input/output schema, no examples, and no further documentation. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does, callers should treat it as an opaque premium endpoint with unknown behavior.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","misc"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","premium api access"],"warnings":["Endpoint /api/endpoint-43 is not listed among the named endpoints on the landing page — its actual functionality is unknown.","No input or output schema is provided; callers cannot know what to send or what to expect back.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content.","The platform's legitimacy and reliability are unverifiable from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-43","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/endpoint-43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the endpoint path doesn't match any named service on the site. The docs/pricing/API pages are all empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,85,153 '000':76 '20':75 '6':81 'accept':62 'access':42,60,187 'across':111 'actual':220 'advertis':95,109 'ai':121 'amount':73 'analysi':125 'analyt':115 'api':5,20,40,59,89,186,202 'base':8,23,50,66,77 'base network api' 'behavior':233 'broader':107 'call':4,19 'caller':96,222 'categori':113 'challeng':69 'classif':128 'collect':34 'connect':208 'content':214 'convers':145 'correspond':163 'data':114,118 'decim':82 'descript':182 'doc':199 'document':197 'embed':129 'endpoint':41,54,110,149,159,169,219,230 'equal':84 'estim':139 'exact':177 'exampl':193 'exchang':134 'export':119 'feed':133 'financ':130 'four':112 'function':178 'gas':138 'generat':146 'geocod':143 'header':105 'host':32 'howev':156 'http-post' 'indic':70 'infrastructur':141 'input/output':190 'insight':120 'key':90 'know':216 'label':57 'land':174 'learn':123 'limit':93 'list':148 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':122 'maximum':72 'metric':116 'micropayment api' 'name':168 'network':9,24,51 'no-api-key' 'opaqu':228 'page':175,203 'pay':2,17,37,97 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':36 'payment':46,64,104 'per':3,18,38,86,98,154 'platform':6,21,108 'premium':58,185,229 'premium api access' 'price':132,151,200 'prompt':210 'protocol':47 'quot':137 'rate':92,135 'report':117 'request':39,87,99,155 'return':205 'say':184 'schema':191 'sentiment':124 'simpli':183 'site':172 'specif':53,158 'substant':213 'summar':127 'text':126 'token':136 'treat':224 'undocu':180 'unit':78 'unknown':232 'usdc':15,30,63,80 'usdc api' 'usdc-base-network' 'use':100 'util':142 'valid':144 'via':10,25,43 'wallet':209 'web3':131 'without':215 'x':103 'x-payment':102 'x402':11,26,45,68 'x402 api' 'x402-payment'","prices":[{"id":"3354cded-903b-446f-a623-1212c5ad3608","listingId":"32056a8b-40a7-48d9-b9e9-9369fe2b0cbb","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/endpoint-43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:28.314Z"}],"sources":[{"listingId":"32056a8b-40a7-48d9-b9e9-9369fe2b0cbb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:28.314Z","lastSeenAt":"2026-04-22T13:30:19.575Z"}],"details":{"listingId":"32056a8b-40a7-48d9-b9e9-9369fe2b0cbb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-43 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-43"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-43"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an unnamed premium API service for $0.02 per call","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need low-cost per-request API access without signup","Crypto-native applications settling microtransactions on Base"],"notFor":["Users who need documented input/output schemas before calling","Anyone requiring guaranteed SLAs or support","Use cases requiring free or subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:01:18.053Z"},"updatedAt":"2026-04-22T13:30:19.575Z"}}