{"id":"cc4afdda-20fb-4f61-8d52-d1f093a56c03","shortId":"f64B8D","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com/api/endpoint-83 is an x402-gated API labeled \"Premium API Access.\" The provider's site advertises a broad suite of endpoints spanning data & analytics, 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint probed (/api/endpoint-83) returned a valid x402 challenge with maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nHowever, the crawled documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no actual documentation, schemas, or usage examples. It is unclear what specific functionality /api/endpoint-83 provides — the path does not match any of the named endpoints listed on the homepage. Without request/response schemas or documentation, callers cannot know what payload to send or what data to expect back.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — all doc pages return only 'Connect wallet'","/api/endpoint-83 does not match any of the named endpoints listed on the homepage","No request or response schema provided; callers cannot determine what payload to send","Provider site lists many endpoints but none with detailed specs or examples"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-83","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-83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge at $0.02/request in USDC on Base. However, there is no documentation, no request/response schema, and /api/endpoint-83 does not correspond to any named endpoint on the site. The docs, pricing, and README pages are all empty (just 'Connect wallet'). This is effectively a stub 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'/api/endpoint-83':42,121,201 '/docs':176 '/pricing':178 '/readme':179 '/request':12,30 '0.02':11,29,97,144 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':136 '20':130 '2913':137 '300':160 '6':140 'Base network API' 'USDC micropayment endpoint' 'accept':165 'access':52 'actual':189 'address':156 'advertis':57 'ai':66 'analysi':70 'analyt':65 'api':6,16,24,34,48,51,109 'application/json':170 'back':234 'base':8,26,105,132,139 'broad':59 'call':4,22,146 'caller':222 'cannot':223 'challeng':126 'classif':73 'commit':116 'connect':184 'convers':90 'crawl':173 'data':64,231 'decim':141 'document':174,190,221 'embed':74 'endpoint':38,62,93,119,164,212 'equal':143 'estim':84 'exact':153 'exampl':194 'exchang':79 'expect':233 'feed':78 'financ':75 'function':200 'gas':83 'gate':47 'generat':91 'geocod':88 'homepag':216 'howev':171 'http':166 'http-post' 'infrastructur':86 'json-response' 'key':17,35,110 'know':224 'label':49 'learn':68 'limit':113 'list':213 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-83':40 'machin':67 'made':149 'match':207 'maxamountrequir':128 'name':211 'network':106 'page':175 'path':204 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':226 'payment':147 'per':3,21,98,145 'post':167 'premium':5,23,50 'premium API access' 'price':77,95 'probe':120 'prompt':186 'provid':54,202 'quot':82 'rate':80,112 'request':99 'request/response':218 'requir':18,36 'return':122,169,181 'schema':191,219 'scheme':154 'second':161 'send':228 'sentiment':69 'settl':100 'site':56 'span':63 'specif':118,199 'suit':60 'summar':72 'text':71 'timeout':162 'token':81 'unclear':197 'unit':133 'usag':193 'usdc':14,32,102,135 'usdc-base' 'util':87 'valid':89,124 'via':9,27,150 'wallet':185 'web3':76 'without':217 'x402':10,28,46,125,152 'x402 API' 'x402-gated':45 'x402-payment'","prices":[{"id":"b082e7f6-5d20-4696-9119-0fb700bac8ac","listingId":"cc4afdda-20fb-4f61-8d52-d1f093a56c03","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-83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:13.705Z"}],"sources":[{"listingId":"cc4afdda-20fb-4f61-8d52-d1f093a56c03","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:13.705Z","lastSeenAt":"2026-04-22T11:31:05.620Z"}],"details":{"listingId":"cc4afdda-20fb-4f61-8d52-d1f093a56c03","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-83\n# Returns 402 with x402 challenge; include X-PAYMENT header with USDC payment proof on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/endpoint-83"},{"claim":"Provider lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-initiated pay-per-call API access without API key management","Programmatic micropayment-gated data retrieval on Base","Testing x402 payment flows with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Low-cost per-request usage without subscriptions"],"notFor":["Users who need documented request/response schemas before integrating","High-throughput batch processing where per-call costs add up","Anyone requiring detailed API documentation or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.543Z"},"updatedAt":"2026-04-22T11:31:05.620Z"}}