{"id":"ba7c89c9-9380-4f9b-83be-a51266da6cf5","shortId":"mC8pHK","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, and infrastructure utilities. 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/transfers/177` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The x402 challenge confirms the endpoint is live and accepting payment challenges (version 1, scheme \"exact\").\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 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 actual functionality behind `/api/v1/transfers/177` specifically is unclear — the name \"Premium API Access\" and the path segment \"transfers/177\" do not clearly indicate what data or service is returned.","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","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API access"],"warnings":["No OpenAPI spec or schema documentation available","The /docs, /pricing, /api, and /README pages contain no usable content","The actual functionality behind /api/v1/transfers/177 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides","All advertised endpoints ($0.02 each) lack request/response format documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/177","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/transfers/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of this specific endpoint (/api/v1/transfers/177) is entirely unclear. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/transfers/177':94,232 '/docs':192 '/pricing':194 '/readme':196 '/request':13,28 '0.02':12,27,62,119,179 '000':108 '0x8335':113 '1':146 '20':107 '2913':114 '6':123 'Base network API' 'USDC API' 'accept':127,142 'access':100,240 'account':74 'across':45 'actual':229 'advertis':102,152 'ai/ml':48 'analysi':156 'analyt':47 'api':5,20,37,72,99,239 'application/json':132 'attach':82 'avail':223 'base':8,23,69,109,116 'base-network' 'behind':231 'beyond':184 'broader':150 'call':4,19 'caller':80 'challeng':135,144 'classif':159 'clear':248 'confirm':136 'connect':202 'convers':171 'cost':105 'crawl':226 'crypto-paid API' 'data':46,173,251 'decim':124 'detail':209 'document':183,218 'embed':160 'enabl':36 'endpoint':44,55,92,126,138,153 'equal':118 'estim':168 'exact':148 'exampl':222 'exchang':163 'extrem':189 'feed':162 'finance/web3':50 'function':230 'gas':167 'generat':174 'geocod':169 'given':120 'header':86 'howev':182 'indic':249 'infer':49 'infrastructur':52 'json-response' 'key':73 'land':186 'limit':77 'list':96 'live':140 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':227 'maximum':104 'micropayment API' 'name':237 'network':9,24,70 'no-api-key' 'offer':40 'openapi':213 'page':187,197 'path':243 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':57 'payment':85,143 'per':3,18,59 'platform':6,21,38,151 'point':181 'post':128 'post-method' 'premium':98,238 'price':161,180 'prompt':204 'quot':166 'rate':76,164 'render':199 'request':60,89,129 'request/response':216 'requir':79 'return':131,255 'schema':217 'scheme':147 'segment':244 'sentiment':155 'serverless API access' 'servic':253 'settl':64 'simpli':81 'spars':190 'spec':214 'specif':91,233 'summar':158 'technic':208 'text':157 'token':165 'transfers/177':245 'unclear':235 'unit':110 'usag':221 'usdc':15,30,66,112,121 'usdc-settlement' 'util':53 'valid':170 'varieti':42 'version':145 'via':10,25 'wallet':203 'x402':11,26,35,84,134 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2985c43b-d8ec-4659-a46d-56b87e09a49c","listingId":"ba7c89c9-9380-4f9b-83be-a51266da6cf5","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/transfers/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:28.885Z"}],"sources":[{"listingId":"ba7c89c9-9380-4f9b-83be-a51266da6cf5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:28.885Z","lastSeenAt":"2026-04-23T04:02:06.143Z"}],"details":{"listingId":"ba7c89c9-9380-4f9b-83be-a51266da6cf5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/177 \\\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/transfers/177"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need instant, permissionless API access"],"bestFor":["Developers who want zero-friction, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.995Z"},"updatedAt":"2026-04-23T04:02:06.143Z"}}