{"id":"c3f720f1-363a-495b-aed9-b9de179d6432","shortId":"TZqdRQ","kind":"x402","title":"Pay-per-call premium API access via x402 on Base network for $0.02 USDC per request.","tagline":"Pay-per-call premium API access via x402 on Base network for $0.02 USDC per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/apikeys/67` accepts POST requests and charges 20,000 base units of USDC (0x8335...2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nHowever, the specific endpoint `/api/v1/apikeys/67` is labeled \"Premium API Access\" without further documentation on what it returns or what input it expects. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example requests or responses, and no description of the response payload.","tags":[],"capabilities":["x402-payment","per-call-billing","base-network","usdc-settlement","no-api-key-required"],"categories":["api-access","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available beyond the landing page listing","No OpenAPI schema or response format described","Purpose of /api/v1/apikeys/67 specifically is undocumented — may generate API keys or provide some other function","All docs/pricing/API pages render only 'Connect wallet' with no technical content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/67","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/apikeys/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 challenge correctly) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually returns, no input/output schema, no example requests or responses, and the docs pages are empty. The purpose of this specific endpoint ('Premium API Access' at /apikeys/67) is 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'0.02':14,31,73,128 '000':62 '0x8335':67 '20':61 '2913':68 '6':79 'Base network API' 'USDC API access' 'accept':56 'access':7,24,42,140,150 'addit':178 'advertis':85 'ai':97 'analysi':101 'analyt':91 'api':6,23,41,87,133,149,167 'base':11,28,50,63,70 'base-network' 'broader':82 'call':4,21 'categori':88 'charg':60 'classif':104 'connect':173 'convers':121 'data':90,94 'decim':80 'descript':193 'detail':180 'doc':164 'document':153 'embed':105 'endpoint':36,54,124,144 'equal':72 'estim':115 'exampl':187 'exchang':110 'expect':162 'export':95 'feed':109 'financ':106 'gas':114 'generat':122 'geocod':119 'given':76 'howev':141 'includ':89 'infrastructur':117 'input':160 'insight':96 'instant':139 'key':134 'label':147 'learn':99 'limit':137 'list':126 'lowpaymentfee' 'lowpaymentfee.com':38,83 'machin':98 'metric':92 'micropayment API' 'multipl':86 'network':12,29,51 'no-api-key-required' 'openapi':184 'page':168 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payload':197 'payment':46 'per':3,16,20,33,74,129 'per-call-billing' 'platform':84 'post':57 'premium':5,22,40,148 'premium API' 'price':108,165 'prompt':175 'protocol':47 'provid':39 'quot':113 'rate':111,136 'render':170 'report':93 'request':17,34,58,75,130,188 'respons':190,196 'return':157 'schema':185 'sentiment':100 'specif':53,143 'summar':103 'technic':179 'text':102 'token':112 'unit':64 'usdc':15,32,66,77 'usdc-settlement' 'util':118 'valid':120 'via':8,25,43 'wallet':174 'web3':107 'without':151 'x402':9,26,45 'x402 API' 'x402-payment'","prices":[{"id":"9c4136a1-73dc-4541-be36-361a8256158e","listingId":"c3f720f1-363a-495b-aed9-b9de179d6432","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/apikeys/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:42.131Z"}],"sources":[{"listingId":"c3f720f1-363a-495b-aed9-b9de179d6432","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:42.131Z","lastSeenAt":"2026-04-23T05:01:54.995Z"}],"details":{"listingId":"c3f720f1-363a-495b-aed9-b9de179d6432","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/67 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/apikeys/67"},{"claim":"Platform lists multiple API categories all at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/67"}],"useCases":["Programmatic access to premium API services without subscription commitments","Agent-driven API consumption with per-request crypto payments","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting pay-as-you-go API access without signup","AI agents that can settle payments via x402 on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation before purchasing","High-volume consumers who would benefit from bulk pricing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.578Z"},"updatedAt":"2026-04-23T05:01:54.995Z"}}