{"id":"8811ffff-4cad-4354-ac62-e916fc58f27f","shortId":"t7EFLU","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/charges/270` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\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 endpoint being listed here (`/api/v1/charges/270`) is labeled only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. Without documentation or example responses, it is unclear what this particular endpoint actually does or returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet'","The endpoint description 'Premium API Access' is generic and does not describe actual functionality","No OpenAPI spec, no example requests or responses, no input/output schema beyond 'POST application/json'","Cannot verify what data or service this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/270","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/charges/270","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the endpoint name 'Premium API Access' is completely generic. The docs pages are empty ('Connect wallet' only). It is impossible to determine what this endpoint actually 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'/request':13,30,153 '0.02':12,29,71,152 '000':75 '20':74 '6':81 'Base network API' 'USDC API access' 'accept':50 'access':66,170 'actual':214 'addit':200 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,84,109,169,186 'base':8,25,55,76 'broader':105 'call':4,21,73 'categori':110 'classif':126 'commit':90 'connect':195 'content':201 'convers':143 'cost':68 'data':112,116,177 'decim':82 'doc':183 'document':174,203 'embed':127 'endpoint':59,146,159,213 'estim':137 'exampl':205 'exchang':132 'export':117 'feed':131 'financ':128 'function':179 'gas':136 'generat':144 'geocod':141 'header':103 'howev':156 'http-post' 'includ':111 'individu':97 'infrastructur':139 'insight':118 'key':16,33,85 'label':165 'learn':121 'limit':87 'list':62,148,161 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'metric':114 'micropayment API' 'multipl':108 'network':56 'no-api-key' 'page':187 'paid':96 'particular':212 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,102 'per':3,20,40,72 'platform':6,23,43,106 'point':155 'premium':64,168 'price':130,154,184 'prompt':197 'protocol':48 'quot':135 'rate':86,133 'render':192 'report':115 'request':41,94 'requir':17,34,92 'respons':206 'return':181,217 'sentiment':122 'site':190 'specif':58,158 'summar':125 'text':124 'token':134 'unclear':209 'unit':77 'upfront':89 'usdc':9,26,51,79 'usdc-base' 'use':45 'util':140 'valid':142 'via':10,27,98 'wallet':196 'web3':129 'without':202 'x':101 'x-payment':100 'x402':11,28,47 'x402 API' 'x402-payment'","prices":[{"id":"b5fbd640-234a-484f-a386-eba3d9ce5f5b","listingId":"8811ffff-4cad-4354-ac62-e916fc58f27f","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/charges/270","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:49.037Z"}],"sources":[{"listingId":"8811ffff-4cad-4354-ac62-e916fc58f27f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/270","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:49.037Z","lastSeenAt":"2026-04-24T12:03:21.457Z"}],"details":{"listingId":"8811ffff-4cad-4354-ac62-e916fc58f27f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/270 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/270"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/270"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to undocumented premium content"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or rate guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.312Z"},"updatedAt":"2026-04-24T12:03:21.457Z"}}