{"id":"69660ad2-02fa-428c-9475-5bf5ca10bbb1","shortId":"jUDfdk","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/4` is labeled \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\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 share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The x402 challenge confirms the endpoint is live and accepting POST requests, but the actual functionality behind `/api/resource/4` is not described beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI spec or request/response schema provided","The specific functionality of /api/resource/4 ('Premium API Access') is completely undescribed","Cannot verify what data or service is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/resource/4","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/resource/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schemas, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':18,36,148 '0.02':17,35,68,147 '000':72 '20':71 '6':78 'accept':200 'access':63,217 'across':105 'actual':205 'advertis':103 'ai':12,30,115 'analysi':119 'analyt':11,29,109 'api':5,23,45,62,81,156,216 'attach':92 'avail':186 'base':8,26,52,73 'base network api' 'base-network' 'behind':207 'beyond':212 'broader':101 'call':4,22 'caller':90 'categori':107 'challeng':193 'classif':122 'collect':40 'commit':87 'confirm':194 'connect':165 'convers':139 'cost':65 'cover':10,28 'crawl':189 'data':108,112 'decim':79 'describ':211 'detail':172 'doc':155 'document':150,181 'embed':123 'enabl':44 'endpoint':46,56,104,143,196 'estim':133 'exampl':185 'exchang':128 'export':113 'extrem':152 'feed':127 'financ':13,31,124 'four':106 'function':206 'gas':132 'generat':140 'generic':214 'geocod':137 'header':96 'infrastructur':135 'insight':114 'json-response' 'key':82 'label':60,218 'learn':117 'limit':84 'list':142 'live':198 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':116 'materi':190 'metric':110 'micropayment api' 'network':53 'no-api-key' 'offer':38 'openapi':176 'page':160 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95 'per':3,21,69 'platform':102 'post':201 'post-method' 'premium':61,215 'price':126,149,157 'prompt':167 'quot':131 'rate':83,129 'readm':159 'render':162 'report':111 'request':70,99,202 'request/response':179 'requir':89 'schema':180 'sentiment':118 'settl':47 'share':144 'simpli':91 'spars':153 'spec':177 'specif':55 'suit':6,24 'summar':121 'technic':171 'text':120 'token':130 'unit':74 'upfront':86 'usag':184 'usdc':9,27,49,76 'usdc api' 'usdc-settlement' 'util':15,33,136 'valid':138 'wallet':166 'web3':125 'x402':43,94,192 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"84cc2b45-5130-43b9-8a02-eaa4e42057fc","listingId":"69660ad2-02fa-428c-9475-5bf5ca10bbb1","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/resource/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:27.943Z"}],"sources":[{"listingId":"69660ad2-02fa-428c-9475-5bf5ca10bbb1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:27.943Z","lastSeenAt":"2026-04-23T10:30:30.256Z"}],"details":{"listingId":"69660ad2-02fa-428c-9475-5bf5ca10bbb1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/4 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/4"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/4"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing low-friction, no-signup API access","Use cases requiring per-request billing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.841Z"},"updatedAt":"2026-04-23T10:30:30.256Z"}}