{"id":"40beec8c-e735-4ffb-a0fe-89372d26a60e","shortId":"XrAHnZ","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 variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transfers/74` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind each endpoint is unverified. The specific purpose of the `/api/v1/transfers/74` endpoint beyond its \"Premium API Access\" label is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The purpose and functionality of /api/v1/transfers/74 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available — integration requires trial and error.","The platform lists many endpoint categories but none have verifiable documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/74","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/transfers/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint ('Premium API Access' at /transfers/74) is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,61,116 '000':105 '0x8335':110 '20':104 '2913':111 '300':137 '6':120 'accept':94 'access':92,208 'across':45 'actual':190 'address':134 'advertis':100,143 'ai':48 'analysi':152 'analyt':47 'api':5,20,37,73,91,175,207 'avail':213 'base':8,23,69,106,113 'base network api' 'behind':192 'beyond':204 'broader':141 'call':4,19 'categori':55 'challeng':99 'classif':155 'commit':80 'connect':181 'content':187 'convers':167 'data':46,148 'decim':121 'doc':173 'document':171 'embed':156 'enabl':36 'endpoint':44,57,84,144,194,203 'equal':115 'estim':164 'exact':128 'exchang':159 'export':149 'feed':158 'financ':51 'function':191 'gas':163 'generat':169 'geocod':165 'given':117 'howev':170 'infrastructure/utility':54 'insight':150 'json-response' 'key':74 'label':209 'learn':50 'limit':77 'list':88 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':124 'materi':214 'maxamountrequir':102 'metric':146 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'page':172 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':64 'payment':122 'payto':133 'per':3,18,62 'platform':6,21,38,142 'post':95 'post-endpoint' 'premium':90,206 'price':59,157,174 'prompt':183 'purpos':199 'quot':162 'rate':76,160 'readm':176 'report':147 'request':63,96 'requir':81 'return':178 'scheme':129 'second':138 'sentiment':151 'specif':83,198 'specifi':132 'substant':186 'summar':154 'text':153 'timeout':139 'token':161 'unclear':211 'unit':107 'unverifi':196 'usdc':15,30,66,109,118 'usdc api' 'usdc-base-network' 'valid':166 'varieti':42 'via':10,25,125 'wallet':182 'web3':52 'x402':11,26,35,98,127 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ac854710-39fe-4dc0-abbe-3f555ebdbca6","listingId":"40beec8c-e735-4ffb-a0fe-89372d26a60e","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/transfers/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:54.894Z"}],"sources":[{"listingId":"40beec8c-e735-4ffb-a0fe-89372d26a60e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:54.894Z","lastSeenAt":"2026-04-22T15:02:25.600Z"}],"details":{"listingId":"40beec8c-e735-4ffb-a0fe-89372d26a60e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, and 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/v1/transfers/74"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Making one-off API requests without subscription commitments"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.751Z"},"updatedAt":"2026-04-22T15:02:25.600Z"}}