{"id":"b1c15732-d9c7-420c-9715-8e9bb53b5c6f","shortId":"VQpjz5","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid 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 to each HTTP request and receive the response immediately upon settlement.\n\nThe specific endpoint at `/api/v1/transfers/17` is listed as \"Premium API Access\" and returns an x402 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 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 (geocoding, validation, conversion, generation). However, documentation beyond the landing page is essentially empty — 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 crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","402 payment required"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (docs, pricing, README, api) are empty — only show 'Connect wallet'","The endpoint path '/api/v1/transfers/17' does not match any of the advertised API categories; its actual function is unknown","No examples of request bodies or response payloads are available from any source","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/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/transfers/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific endpoint '/api/v1/transfers/17' has a generic 'Premium API Access' description with no indication of what it actually does. This is effectively a stub 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'/request':13,28 '0.02':12,27,61,135 '000':124 '0x8335':129 '20':123 '2913':130 '300':148 '402 payment required' '6':139 'accept':153 'access':114 'advertis':162 'ai':174 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':178 'analyt':48,168 'api':5,20,37,73,113,166,210 'application/json':158 'attach':89 'avail':239 'base':8,23,69,125,132 'base network api' 'beyond':201 'broad':42 'broader':160 'call':4,19 'caller':88 'categori':164 'challeng':119 'classif':181 'commit':80 'connect':219 'content':225 'convers':197 'conversion' 'crawl':242 'crypto-gas-estimates' 'data':47,52,167,171 'data-analytics' 'decim':140 'doc':209 'document':200,234 'embed':182 'empti':207 'enabl':36 'endpoint':45,57,106,152 'equal':134 'essenti':206 'estim':192 'everi':56 'exact':145 'exampl':238 'exchang':187 'exchange-rates' 'export':172 'feed':186 'financ':183 'finance-price-feeds' 'finance/web3':51 'four':163 'gas':191 'generat':198 'geocod':195 'geocoding' 'given':136 'handl':85 'header':92 'howev':199 'http':95 'immedi':101 'infer':50 'infrastructur':54,194 'inlin':87 'insight':173 'key':74 'land':203 'learn':176 'limit':77 'list':110 'low payment fee' 'lowpaymentfee.com':31 'machin':175 'materi':243 'metric':169 'micropayment api' 'network':9,24,70 'no-api-key endpoint' 'offer':40 'openapi':229 'page':204,214 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':86,91,142 'per':3,18,62 'per-request-billing' 'platform':6,21,38,161 'post':154 'premium':112 'price':59,185,211 'prompt':221 'protocol':84 'quot':190 'rate':76,188 'readm':213 'receiv':98 'render':216 'report':170 'request':63,96,120,155 'request/response':232 'requir':81 'respons':100 'return':116,157 'schema':233 'scheme':143 'second':149 'sentiment':177 'set':43 'settlement':103 'span':46 'spec':230 'specif':105 'summar':180 'text':179 'timeout':150 'token':189 'unit':126 'upon':102 'usag':237 'usdc':15,30,66,128,137 'usdc api' 'usdc-base' 'util':55 'valid':196 'validation' 'via':10,25 'wallet':220 'web3':184 'x402':11,26,35,83,118 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"774d52d7-dee3-4d47-987f-e65010c96c81","listingId":"b1c15732-d9c7-420c-9715-8e9bb53b5c6f","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/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":"2026-04-18T19:27:27.619Z"}],"sources":[{"listingId":"b1c15732-d9c7-420c-9715-8e9bb53b5c6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:27.619Z","lastSeenAt":"2026-04-22T09:01:47.815Z"}],"details":{"listingId":"b1c15732-d9c7-420c-9715-8e9bb53b5c6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/17 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $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/17"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) on a pay-per-use basis without API key management","Fetching real-time crypto price feeds, exchange rates, and gas estimates via micropayments","Running data analytics queries and exporting data with per-request USDC payments","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","x402-compatible clients that can settle USDC payments on Base network"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Callers who cannot settle crypto payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.015Z"},"updatedAt":"2026-04-22T09:01:47.815Z"}}