{"id":"2291affb-dc56-4335-a5a8-83b176566b0f","shortId":"YuJjEy","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 priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header and the server fulfills the request upon verification.\n\nThe specific endpoint at `/api/v1/transfers/64` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The probe confirms it is live, returning a 402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The broader platform advertises categories including metrics, reports, data export, insights, 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 price point.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The platform's exact capabilities behind each endpoint name remain unverified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The specific endpoint /api/v1/transfers/64 ('Premium API Access') has no documented functionality — its purpose is unclear.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, no request/response schemas, and no usage examples are available.","The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/64","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/64","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 the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint names, and the specific function of /api/v1/transfers/64 is undocumented. The docs pages are empty. This is effectively a stub 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'/api/v1/transfers/64':103 '/docs':191 '/pricing':193 '/readme':195 '/request':13,28 '0.02':12,27,59,144,183 '000':134 '0x8335':139 '20':133 '402':128 '6':147 'access':109 'across':45 'advertis':152 'ai-inference' 'ai/ml':48 'analysi':161 'analyt':47 'api':5,20,37,71,108 'attach':87 'avail':221 'base':8,23,67,135,141 'base network api' 'behind':230 'beyond':117 'broader':150 'call':4,19 'caller':86 'capabl':229 'categori':153 'challeng':129 'classif':164 'classification' 'commit':78 'confirm':122 'connect':201 'content':207 'convers':176 'crawl':224 'data':46,157 'data-analytics' 'decim':148 'document':116,186,216 'embed':165 'embeddings' 'enabl':36 'endpoint':44,55,101,232 'equal':143 'estim':173 'exact':112,228 'exampl':220 'exchang':168 'export':158 'extrem':188 'feed':167 'finance-data' 'finance/web3':50 'fulfil':94 'function':113 'gas':172 'generat':178 'geocod':174 'geocoding' 'handl':83 'header':90 'includ':154 'infer':49 'infrastructur':52 'inlin':85 'insight':159 'key':72 'label':119 'limit':75 'list':105 'live':125 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'metric':155 'micropayment api' 'name':233 'network':9,24,68 'offer':40 'openapi':211 'page':196 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':62 'payment':84,89 'per':3,18,60 'platform':6,21,38,151,226 'point':185 'premium':107 'price':57,166,184 'probe':121 'prompt':203 'protocol':82 'quot':171 'rate':74,169 'remain':234 'render':198 'report':156 'request':61,96,130 'request/response':214 'requir':79 'return':126 'schema':215 'sentiment':160 'sentiment-analysis' 'server':93 'spars':189 'spec':212 'specif':100 'summar':163 'text':162 'text-summarization' 'token':170 'unit':136 'unverifi':235 'upon':97 'usag':219 'usdc':15,30,64,138,145 'usdc api' 'usdc-base' 'use':146 'util':53 'utility-apis' 'valid':175 'varieti':42 'verif':98 'via':10,25 'wallet':202 'x402':11,26,35,81 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2b1939a4-eaeb-4f11-b8a2-774e7e4be7f9","listingId":"2291affb-dc56-4335-a5a8-83b176566b0f","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:57.899Z"}],"sources":[{"listingId":"2291affb-dc56-4335-a5a8-83b176566b0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:57.899Z","lastSeenAt":"2026-04-22T15:02:25.765Z"}],"details":{"listingId":"2291affb-dc56-4335-a5a8-83b176566b0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/64 \\\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":"The x402 challenge for /api/v1/transfers/64 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/64"},{"claim":"Platform advertises endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates via micropayments","Running geocoding or data validation utilities on a per-request payment basis","Exporting data or generating analytics reports with no subscription commitment"],"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 utility endpoints without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.572Z"},"updatedAt":"2026-04-22T15:02:25.765Z"}}