{"id":"dcfed6bc-0032-468c-aa75-37d3a94bca23","shortId":"Bc9BnF","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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 are priced at $0.02 per request and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/267` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme — no API keys, no subscriptions, no rate limits. The endpoint accepts HTTP POST and returns application/json.\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 examples of what this particular endpoint actually returns. The landing page lists many endpoints but provides no detail on input parameters or output formats. As a result, while the endpoint is confirmed live and the pricing is clear, the actual functionality behind \"Premium API Access\" at `/api/v1/charges/267` is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — actual request parameters and response format are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/267 is labeled 'Premium API Access' but its actual functionality is not described anywhere","The endpoint path '/charges/267' does not correspond to any of the named endpoints on the landing page catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/267","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/charges/267","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific functionality of /api/v1/charges/267 ('Premium API Access') is entirely undocumented. This is effectively a stub 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'/api/v1/charges/267':110,248 '/docs':174 '/pricing':176 '/readme':178 '/request':13,30 '0.02':12,29,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '6':143 'Base network API' 'USDC API' 'accept':163 'access':116,246 'across':54 'actual':208,241 'ai':64 'analysi':68 'analyt':58 'api':5,15,22,32,41,115,154,245 'application/json':168 'base':8,25,104,129,136 'base-network' 'behind':243 'broad':46 'call':4,21 'catalog':47 'categori':56 'challeng':122 'classif':71 'clear':239 'confirm':233 'connect':184 'content':190 'convers':88 'crypto-paid API' 'data':57,61 'decim':144 'detail':219 'document':169,199 'embed':72 'enabl':40 'endpoint':53,91,108,162,207,215,231 'equal':138 'estim':82 'exact':151 'exampl':202 'exchang':77 'export':62 'extrem':171 'feed':76 'financ':73 'format':225 'four':55 'function':242 'gas':81 'generat':89 'geocod':86 'given':140 'http':164 'http-post' 'infrastructur':84 'input':221 'insight':63 'json-response' 'key':16,33,155 'land':211 'learn':66 'limit':160 'list':112,213 'live':234 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':65 'made':147 'mani':214 'maxamountrequir':125 'metric':59 'micropayment API' 'network':105 'no-api-key' 'offer':44 'openapi':194 'output':224 'page':179,212 'paramet':222 'particular':206 'pay':2,19,50 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':49 'payment':145 'per':3,20,51,96 'platform':6,23,42 'post':165 'premium':114,244 'premium API access' 'price':75,93,237 'prompt':186 'provid':217 'quot':80 'rate':78,159 'render':181 'report':60 'request':52,97 'request/response':197 'requir':17,34 'result':228 'return':118,167,209 'schema':198 'scheme':152 'sentiment':67 'settl':99 'spars':172 'spec':195 'specif':107 'subscript':157 'summar':70 'text':69 'token':79 'unit':130 'unknown':250 'usdc':9,26,101,132,141 'usdc-settlement' 'util':85 'valid':87,120 'via':10,27,148 'wallet':185 'web3':74 'x402':11,28,39,121,150 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"9ace4956-19b1-4cc3-869c-518d07ae9519","listingId":"dcfed6bc-0032-468c-aa75-37d3a94bca23","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/charges/267","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:43.012Z"}],"sources":[{"listingId":"dcfed6bc-0032-468c-aa75-37d3a94bca23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/267","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:43.012Z","lastSeenAt":"2026-04-23T09:31:00.528Z"}],"details":{"listingId":"dcfed6bc-0032-468c-aa75-37d3a94bca23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/267 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and settle on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/267"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call data analytics or AI inference without managing API keys or subscriptions","Programmatic agents making one-off API calls settled instantly in USDC on Base","Integrating low-cost utility endpoints (geocoding, validation, conversion) into workflows"],"bestFor":["Developers or agents wanting zero-friction, keyless API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty usage patterns where per-request pricing is economical"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.6Z"},"updatedAt":"2026-04-23T09:31:00.528Z"}}