{"id":"f66082ed-adb8-44b9-bd02-de86aee86227","shortId":"yP7Krt","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/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/80` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests 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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no usable API docs exist.","No request or response schema is documented for any endpoint, including this one.","The specific function of /api/v1/charges/80 ('Premium API Access') is unclear — it does not match any of the named endpoints on the landing page.","The platform's actual data sources and AI model details are completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/80","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/80","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, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc/pricing/API pages render only a wallet-connect prompt. No request or response schemas are available for any endpoint, and the purpose of this specific '/charges/80' path versus the other advertised endpoints is 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'/request':13,28 '0.02':12,27,63,122,176 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'Base network API' 'USDC micropayment API' 'accept':140 'access':101 'account':75 'across':45 'actual':200 'advertis':149 'ai/ml':48 'analysi':153 'analyt':47 'api':5,20,37,73,100 'application/json':145 'attach':83 'base':8,23,70,112,119 'base-network' 'beyond':181 'broader':147 'call':4,19 'caller':81 'challeng':106 'classif':156 'connect':195 'convers':168 'crypto-paid API' 'data':46,51,170 'decim':127 'document':180 'embed':157 'empti':187 'enabl':36 'endpoint':44,56,93,139,150,205 'equal':121 'essenti':186 'estim':165 'exact':132 'exchang':160 'feed':159 'finance/web3':50 'gas':164 'generat':171 'geocod':166 'given':123 'header':87 'howev':179 'individu':204 'infer':49 'json-response' 'key':74 'land':183 'limit':78 'list':97 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'network':9,24,71 'no-api-key' 'offer':40 'page':184,191 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':58 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'point':178 'post':141 'post-method' 'premium':99 'price':158,177 'prompt':197 'quot':163 'rate':77,161 'request':61,90,107,142 'request/response':201 'requir':80 'return':103,144 'schema':202 'scheme':130 'second':136 'sentiment':152 'servic':54 'settl':65 'show':193 'simpli':82 'specif':92 'sub':190 'sub-pag':189 'summar':155 'text':154 'timeout':137 'token':162 'unit':113 'unknown':207 'usdc':15,30,67,115,124 'usdc-settlement' 'util':53 'valid':167 'varieti':42 'via':10,25 'wallet':196 'x402':11,26,35,85 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2fe6490c-f988-4b74-b429-42eae561d011","listingId":"f66082ed-adb8-44b9-bd02-de86aee86227","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:30.779Z"}],"sources":[{"listingId":"f66082ed-adb8-44b9-bd02-de86aee86227","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:30.779Z","lastSeenAt":"2026-04-24T12:03:23.308Z"}],"details":{"listingId":"f66082ed-adb8-44b9-bd02-de86aee86227","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/80 \\\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":"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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/charges/80"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing utility or data APIs without creating an account or managing API keys","Making one-off API calls with instant crypto micropayments","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers who want zero-signup API access via crypto payments","AI agents that need programmatic, keyless API consumption","Users already on the Base network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who prefer subscription-based pricing","Developers without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.348Z"},"updatedAt":"2026-04-24T12:03:23.308Z"}}