{"id":"83a4ba36-7331-469c-80aa-b932b2a3de4d","shortId":"kNSuGF","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transfers/110` is labeled \"Premium API Access\" and accepts POST requests settled via the x402 exact-payment scheme.\n\nThe platform advertises four categories of APIs: 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 follow the same $0.02 pricing model. The x402 challenge for this particular endpoint specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what payload the POST request expects or what response format is returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","llm","geo","data"],"synonyms":["x402 API","micropayment API","pay-per-request","USDC API","Base network API","lowpaymentfee","crypto-paid API","serverless API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific function of /api/v1/transfers/110 ('Premium API Access') is undocumented and unclear","No request body schema or response schema is available; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/110","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/110","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 settlement details. However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The purpose of this specific '/transfers/110' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/transfers/110':84 '/docs':180 '/pricing':182 '/readme':184 '/request':13,28 '0.02':12,27,59,147,170 '20000':161 '402':222 '6':166 'Base network API' 'USDC API' 'accept':91 'access':89 'addit':195 'advertis':104 'ai':116 'ai/ml':49 'analysi':120 'analyt':48,110 'api':5,20,37,71,88,108 'avail':211 'base':8,23,67,162 'base-network' 'beyond':172 'broad':42 'call':4,19 'catalog':43 'categori':106 'challeng':152,223 'classif':123 'commit':79 'connect':190 'convers':140 'cost':58 'crawl':214 'crypto-paid API' 'data':47,52,109,113 'decim':167 'detail':197 'document':171,206,226 'embed':124 'enabl':36 'endpoint':45,57,82,143,156,216 'equal':169 'estim':134 'everi':56 'exact':99 'exact-pay':98 'exampl':210 'exchang':129 'expect':235 'export':114 'extrem':177 'feed':128 'financ':125 'finance/web3':51 'follow':144 'format':239 'four':105 'gas':133 'generat':141 'geocod':138 'infer':50 'infrastructur':136 'insight':115 'json-response' 'key':72 'label':86 'land':174 'learn':118 'limit':75 'live':218 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'maxamountrequir':159 'metric':111 'micropayment API' 'model':149 'network':9,24,68 'no-api-key' 'offer':40 'openapi':201 'page':175,185 'paid':62 'particular':155 'pay':2,17 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request' 'payload':231 'payment':100 'per':3,18,60 'platform':6,21,38,103 'post':92,233 'post-endpoint' 'premium':87 'price':127,148 'prompt':192 'proper':221 'quot':132 'rate':74,130 'render':187 'report':112 'request':61,93,234 'request/response':204 'respons':238 'return':219,241 'schema':205 'scheme':101 'sentiment':119 'serverless API' 'servic':55 'settl':94 'span':46 'spec':202 'specif':81 'specifi':157 'summar':122 'technic':196 'text':121 'thin':178 'token':131 'unclear':229 'unit':163 'upfront':78 'usag':209 'usdc':15,30,64,165 'usdc-settlement' 'util':54,137 'valid':139 'via':10,25,95 'wallet':191 'web3':126 'without':225 'x402':11,26,35,97,151 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"8ff8d0df-655e-4a21-bfea-6eeff98d279e","listingId":"83a4ba36-7331-469c-80aa-b932b2a3de4d","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:20.962Z"}],"sources":[{"listingId":"83a4ba36-7331-469c-80aa-b932b2a3de4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:20.962Z","lastSeenAt":"2026-04-22T16:32:15.953Z"}],"details":{"listingId":"83a4ba36-7331-469c-80aa-b932b2a3de4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/110 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for this endpoint specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/110"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto and finance data (prices, gas estimates, exchange rates)","Using utility services like geocoding and data validation with instant pay-per-use","Integrating agent-purchasable endpoints into autonomous workflows via x402"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micro-transactions for API calls"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who need bulk pricing or SLA guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.281Z"},"updatedAt":"2026-04-22T16:32:15.953Z"}}