{"id":"5e9b013e-b05f-4f92-8a8f-2b1599cb08c4","shortId":"XJNJGj","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 an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint `/api/v1/item/17` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment scheme is \"exact\" and the asset is the canonical Base USDC contract (0x8335…2913). The endpoint accepts HTTP POST and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or example payloads, callers will need to experiment or inspect responses to understand the expected input and output formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) are all empty — only showing 'Connect wallet'","No request or response schema available for this endpoint","The specific function of /api/v1/item/17 is unclear; 'Premium API Access' is a generic label that doesn't describe what the endpoint actually does","The broader platform lists many endpoint categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/17","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/item/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is effectively nonexistent — every docs/pricing/README page just shows 'Connect wallet'. No request or response schemas are available, and the purpose of '/api/v1/item/17' specifically is unclear beyond the generic label 'Premium API Access'. The listing is essentially a 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'/request':13,30,173 '0.02':12,29,66,110,172 '000':105 '0x8335':133 '20':104 '2913':134 '402':99 '6':115 'accept':137 'access':95 'across':54 'actual':195 'advertis':146 'ai/ml':57 'analysi':150 'analyt':56 'api':5,15,22,32,41,79,94 'application/json':142 'asset':126 'base':8,25,71,106,118,130 'base network api' 'beyond':178 'broad':46 'broader':144 'call':4,21,64 'caller':208 'canon':129 'catalog':47 'chain':76 'challeng':100 'classif':153 'connect':191 'contract':132 'convers':165 'cost':65 'data':55 'decim':116 'document':177,204 'embed':154 'empti':184 'enabl':40 'endpoint':53,88,136,147,200 'essenti':183 'estim':162 'exact':123 'exampl':206 'exchang':157 'expect':219 'experi':212 'feed':156 'finance/web3':59 'format':223 'gas':161 'generat':167 'geocod':163 'howev':176 'http':138 'http-post' 'individu':199 'infer':58 'infrastructur':61 'input':220 'inspect':214 'json-response' 'key':16,33,80 'land':180 'limit':82 'list':91 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'micropayment api' 'need':210 'network':72 'no-api-key' 'offer':44 'on-chain':74 'output':222 'page':181,188 'pay':2,19,50 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':49 'payload':207 'payment':120 'per':3,20,51 'platform':6,23,42,145 'point':175 'post':139 'premium':93 'price':155,174 'quot':160 'rate':81,158 'request':52,101 'request/response':196 'requir':17,34,85 'respons':215 'return':97,141 'schema':197 'scheme':121 'sentiment':149 'settl':73 'show':190 'sinc':112 'specif':87 'sub':187 'sub-pag':186 'subscript':84 'summar':152 'text':151 'token':159 'understand':217 'unit':107 'unknown':202 'usd':111 'usdc':9,26,68,109,113,131 'usdc api' 'usdc-base' 'use':114 'util':62 'valid':164 'via':10,27 'wallet':192 'without':203 'x402':11,28,39 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"7a1b15dd-4343-4fce-8f1f-79c02658f3d5","listingId":"5e9b013e-b05f-4f92-8a8f-2b1599cb08c4","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/item/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:28.935Z"}],"sources":[{"listingId":"5e9b013e-b05f-4f92-8a8f-2b1599cb08c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:28.935Z","lastSeenAt":"2026-04-22T15:00:28.389Z"}],"details":{"listingId":"5e9b013e-b05f-4f92-8a8f-2b1599cb08c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/17 \\\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 requesting up to 20,000 base units of USDC on Base (scheme: exact)","source_url":"https://lowpaymentfee.com/api/v1/item/17"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/17"},{"claim":"Platform pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing miscellaneous API services with per-call USDC micropayments on Base","Agent-driven workflows that need on-demand API access without pre-registration","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing keyless, pay-as-you-go API access on Base","Low-volume callers who want no subscription or commitment"],"notFor":["Production workloads requiring well-documented request/response schemas","High-throughput use cases where $0.02/call adds up significantly","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:48:23.687Z"},"updatedAt":"2026-04-22T15:00:28.389Z"}}