{"id":"cda68a1f-1d6f-44f5-ae3c-cdfec1928b9f","shortId":"UGJjbn","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 is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/customers/39` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: (1) Data & Analytics — metrics, reports, data export, and insights; (2) AI & Machine Learning — sentiment analysis, text summarization, classification, and embeddings; (3) Finance & Web3 — price feeds, exchange rates, token quotes, and gas estimates; (4) Infrastructure — geocoding, validation, conversion, and generation utilities. All endpoints follow the x402 payment protocol, where callers attach an `X-PAYMENT` header with a signed payment to access the resource.\n\nThe x402 challenge for this specific endpoint specifies a `maxAmountRequired` of 20000 base units of USDC (contract `0x8335...2913` on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. Documentation pages beyond the landing page are gated behind a wallet connection and provide no additional technical detail.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","crypto-quotes"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all gated behind wallet connection and contain no useful content.","No OpenAPI or schema documentation is available for any endpoint.","The specific purpose and expected input/output of /api/v1/customers/39 is not documented — 'Premium API Access' is a generic label.","The breadth of advertised endpoints (AI, finance, analytics, utilities) is unusually wide for a single provider; actual functionality behind each endpoint is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/39","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/customers/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are gated behind wallet connection, yielding minimal technical detail. The purpose of the specific `/api/v1/customers/39` endpoint is unclear beyond its generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,190 '0x8335':184 '1':104 '2':113 '20000':178 '2913':185 '3':124 '300':203 '4':136 '6':194 'access':90,164 'addit':221 'advertis':98 'ai':114 'ai-inference' 'ai/ml':49 'analysi':118 'analyt':48,106 'api':5,20,37,71,89,103 'application/json':93 'attach':153 'base':8,23,67,179,187 'base network api' 'behind':214 'beyond':208 'broad':42 'call':4,19 'caller':152 'catalog':43 'categori':101 'challeng':169 'classif':121 'classification' 'commit':78 'connect':217 'contract':183 'convers':140 'cost':58 'crypto-quotes' 'data':47,52,105,109 'data-analytics' 'decim':195 'detail':223 'document':206 'embed':123 'embeddings' 'enabl':36 'endpoint':45,57,82,145,173 'equal':189 'estim':135 'everi':56 'exact':200 'exchang':129 'export':110 'feed':128 'financ':125 'finance-data' 'finance/web3':51 'follow':146 'four':99 'gas':134 'gate':213 'generat':142 'geocod':138 'geocoding' 'given':191 'header':158 'infer':50 'infrastructur':54,137 'insight':112 'json-api' 'key':72 'land':210 'learn':116 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'main':100 'maxamountrequir':176 'metric':107 'micropayment api' 'network':9,24,68 'no-api-key' 'no-auth api' 'offer':40 'page':207,211 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':149,157,162,197 'per':3,18,60 'platform':6,21,38,97 'post':95 'premium':88 'price':127 'protocol':150 'provid':219 'quot':132 'rate':74,130 'report':108 'request':61 'requir':79 'resourc':166 'return':92 'scheme':198 'second':204 'sentiment':117 'sentiment-analysis' 'sign':161 'span':46 'specif':81,172 'specifi':174 'summar':120 'technic':222 'text':119 'text-summarization' 'timeout':205 'token':131 'unit':180 'usdc':15,30,64,182,192 'usdc api' 'usdc-base-network' 'util':55,143 'valid':139 'via':10,25,94 'wallet':216 'web3':126 'x':156 'x-payment':155 'x402':11,26,35,148,168 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"9c2cdaa3-73d1-4846-b2eb-e61099a500da","listingId":"cda68a1f-1d6f-44f5-ae3c-cdfec1928b9f","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/customers/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:16.690Z"}],"sources":[{"listingId":"cda68a1f-1d6f-44f5-ae3c-cdfec1928b9f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:16.690Z","lastSeenAt":"2026-04-22T23:00:57.596Z"}],"details":{"listingId":"cda68a1f-1d6f-44f5-ae3c-cdfec1928b9f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/39 \\\n  -H \"X-PAYMENT: <x402-signed-payment>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with scheme 'exact' and 300s timeout.","source_url":"https://lowpaymentfee.com/api/v1/customers/39"}],"useCases":["Querying customer data records on a per-call payment basis without managing API keys","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) at $0.02 per call","Fetching real-time finance data such as exchange rates, token quotes, and gas estimates","Running utility operations like geocoding, validation, and data conversion"],"bestFor":["Agents and developers who want instant API access without signup or key management","Low-volume or bursty workloads where pay-per-call is more economical than subscriptions","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.279Z"},"updatedAt":"2026-04-22T23:00:57.596Z"}}