{"id":"a6d352cc-2b81-4bdf-b459-ac5a6224357e","shortId":"kdpeGE","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of endpoints across four categories: Data & Analytics (metrics, reports, 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 are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/orders/74` is labeled \"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. Payment is handled via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the specified payTo address, and the endpoint returns an `application/json` response. The timeout window is 300 seconds.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the \"Premium API Access\" endpoint actually returns. The platform appears live (402 challenge confirmed, root returns 200), but the lack of documentation makes it difficult to determine what data or functionality this particular order endpoint provides.","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","micropayment api","base network api","usdc api","crypto api gateway","402 payment api"],"warnings":["No OpenAPI specification or machine-readable schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no technical content","The specific purpose of /api/v1/orders/74 ('Premium API Access') is not documented — unclear what it returns","No request body schema or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/74","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/orders/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The purpose of '/api/v1/orders/74' specifically is unclear. This is effectively a stub 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'/api/v1/orders/74':116 '/call':12,31 '/docs':192 '/pricing':193 '/readme':196 '0.02':11,30,93,140 '000':129 '0x8335':134 '20':128 '200':240 '2913':135 '300':181 '402':235 '402 payment api' '6':144 'access':121,227 'across':53 'actual':229 'addit':207 'address':169 'advertis':123 'ai':15,34,62 'ai-inference' 'analysi':66 'analyt':57 'api':5,24,45,105,120,226 'appear':233 'application/json':175 'attach':155 'base':8,27,101,130,137 'base network api' 'beyond':184 'caller':154 'categori':55 'challeng':236 'classif':69 'classification' 'commit':110 'confirm':237 'connect':202 'content':209 'convers':86 'cost':126 'crypto api gateway' 'data':14,33,56,252 'data-analytics' 'decim':145 'determin':250 'difficult':248 'document':183,218,245 'embed':70 'embeddings' 'enabl':44 'endpoint':19,38,52,89,114,172,228,258 'equal':139 'estim':80 'exact':152 'exampl':221 'exchang':75 'export':60 'extrem':189 'feed':74 'financ':16,35,71 'finance-data' 'four':54 'function':254 'gas':79 'generat':87 'geocod':84 'geocoding' 'given':141 'handl':148 'header':160 'infrastructur':82 'insight':61 'key':106 'label':118 'lack':243 'land':186 'learn':64 'limit':108 'live':234 'low payment fee' 'lowpaymentfee.com':39 'machin':63 'make':246 'maximum':125 'metric':58 'micropayment api' 'network':102 'offer':48 'openapi':213 'order':257 'page':187,197 'paid':96 'particular':256 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':146,159,164 'payto':168 'per':3,22,94 'platform':6,25,46,232 'premium':119,225 'price':73,91 'prompt':204 'provid':259 'quot':78 'rate':76,107 'render':199 'report':59 'request':4,23,95 'request/response':216 'requir':111 'respons':176 'return':173,230,239 'root':238 'schema':217 'scheme':153 'second':182 'sentiment':65 'sentiment-analysis' 'sign':163 'spars':190 'spec':214 'specif':113 'specifi':167 'suit':50 'summar':68 'technic':208 'text':67 'text-summarization' 'timeout':178 'token':77 'unit':131 'usdc':98,133,142 'usdc api' 'usdc-base' 'util':18,37,83 'utility-apis' 'valid':85 'via':9,28,149 'wallet':203 'web3':72 'window':179 'x':158 'x-payment':157 'x402':10,29,43,151 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6283ceb0-9316-4e27-9e2b-315c761c1bfa","listingId":"a6d352cc-2b81-4bdf-b459-ac5a6224357e","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/orders/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:11.367Z"}],"sources":[{"listingId":"a6d352cc-2b81-4bdf-b459-ac5a6224357e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:11.367Z","lastSeenAt":"2026-04-23T16:06:39.904Z"}],"details":{"listingId":"a6d352cc-2b81-4bdf-b459-ac5a6224357e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC (=$0.02) with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/orders/74"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use API access via crypto","AI agents that need on-demand inference or data endpoints settled in USDC on Base","Projects needing low-friction micropayment-gated API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or subscription models","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.62Z"},"updatedAt":"2026-04-23T16:06:39.904Z"}}