{"id":"18f24abd-e6a0-42a8-a577-3f21c610da0e","shortId":"dSL29Q","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/83` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader 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 the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/policies/83` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint is live and responds with a well-formed x402 challenge, but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api access","base network api","premium api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing what this endpoint accepts or returns","The label 'Premium API Access' is generic and does not describe the actual service","Cannot verify what data or service is delivered upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/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/v1/policies/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/policies/83 is completely undocumented. All secondary pages render only 'Connect wallet' with no useful 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'/call':13,28 '/request':152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'accept':46 'access':62,169 'actual':215 'addit':194 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,168,183 'attach':91 'base':8,23,51,73 'base network api' 'behind':159 'beyond':164 'broader':104 'call':80 'caller':89 'categori':109 'challeng':67,208 'classif':125 'connect':189 'content':195 'convers':142 'data':111,115,211 'doc':180 'document':163 'embed':126 'endpoint':55,145,197 'estim':136 'exampl':177 'exchang':131 'export':116 'feed':130 'financ':127 'form':206 'function':158 'gas':135 'generat':143 'geocod':140 'header':96 'howev':155 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'json-response' 'key':83 'label':166 'learn':120 'limit':86 'list':58,147 'live':199 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'multipl':107 'network':9,24,52 'no-api-key' 'openapi':173 'page':184 'pay':2,17,35 'pay per call api' 'pay-per-request':1,16,34 'payment':48,95,101,219 'per':3,18,36,79 'platform':6,21,39,105 'point':154 'premium':60,167 'premium api' 'price':129,153,181 'prompt':191 'proof':102 'protocol':44 'quot':134 'rate':85,132 'render':186 'report':114 'request':4,19,37,68 'request/response':176 'requir':88 'respond':201 'return':64,216 'schema':174 'sentiment':121 'servic':213 'simpli':90 'specif':54,157 'success':218 'summar':124 'text':123 'token':133 'unit':74 'unknown':221 'upon':217 'usdc':15,30,47,76 'usdc api access' 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':190 'web3':128 'well':205 'well-form':204 'x':94 'x-payment':93 'x402':11,26,43,100,207 'x402 api' 'x402-payment'","prices":[{"id":"08ab5fd1-833f-4b98-8180-b314fb38d09d","listingId":"18f24abd-e6a0-42a8-a577-3f21c610da0e","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/policies/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":"2026-04-18T18:52:05.648Z"}],"sources":[{"listingId":"18f24abd-e6a0-42a8-a577-3f21c610da0e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:05.648Z","lastSeenAt":"2026-04-24T00:03:47.825Z"}],"details":{"listingId":"18f24abd-e6a0-42a8-a577-3f21c610da0e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/83"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/83"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.215Z"},"updatedAt":"2026-04-24T00:03:47.825Z"}}