{"id":"4d59c665-1035-4411-bb81-62021de431cc","shortId":"cB5f5B","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","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, payable in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/invoices/28` 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. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests 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 the invoices endpoint actually returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them, including this one. Without documentation it is unclear what \"Premium API Access\" at the invoices/28 path actually provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["api-platform","finance","llm","geo","data"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","Purpose of /api/v1/invoices/28 ('Premium API Access') is unclear and undocumented","No request or response examples available anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/28","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/invoices/28","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 challenge, and the landing page confirms pricing and lists many endpoints. However, there is zero documentation for request parameters, response schemas, or what this specific invoices/28 endpoint actually does. No OpenAPI spec, no examples, and all doc pages are empty beyond a wallet connect 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'/call':19,38 '0.02':18,37,99,142 '000':131 '0x8335':136 '20':130 '2913':137 'Base network API' 'USDC API' 'accept':162 'access':119,242 'across':58 'actual':207,247 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,118,152,174,241 'application/json':167 'base':8,27,107,132,139 'broad':50 'catalog':51 'categori':60 'challeng':125 'classif':75 'connect':183 'content':189 'convers':92 'crypto API access' 'data':11,30,61,65 'detail':220 'doc':173 'document':168,198,235 'embed':76 'enabl':44 'endpoint':16,35,57,95,111,161,206,216,253 'equal':141 'estim':86 'exact':149 'exampl':201 'exchang':81 'export':66 'extrem':170 'feed':80 'financ':13,32,77 'format':226 'four':59 'gas':85 'generat':93 'geocod':90 'includ':231 'infrastructur':88 'insight':67 'invoic':205 'invoices/28':245 'json-response' 'key':153 'land':212 'learn':70 'limit':157 'list':115,214,252 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':145 'mani':215 'maxamountrequir':128 'metric':63 'micropayment API' 'network':108 'no-api-key' 'offer':48 'one':233 'openapi':193 'page':178,213 'paramet':223 'path':246 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payabl':102 'payment':143 'per':3,22,55,100 'platform':6,25,46 'post':163 'post-method' 'premium':117,240 'price':79,97,175 'prompt':185 'provid':218,248 'quot':84 'rate':82,156 'readm':177 'render':180 'report':64 'request':4,23,56,101,164,222 'request/response':196 'requir':159 'respons':225 'return':121,166,208 'schema':197 'scheme':150 'sentiment':71 'site':210 'spars':171 'spec':194 'specif':110 'subscript':154 'summar':74 'text':73 'token':83 'unclear':238 'unit':133 'usdc':104,135 'usdc-base' 'util':15,34,89 'valid':91,123 'versus':249 'via':9,28,146 'wallet':184 'web3':78 'without':234 'x402':10,29,43,124,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3dc311b5-cf24-4b0d-8847-4499256a3a42","listingId":"4d59c665-1035-4411-bb81-62021de431cc","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/invoices/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:20.736Z"}],"sources":[{"listingId":"4d59c665-1035-4411-bb81-62021de431cc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:20.736Z","lastSeenAt":"2026-04-23T21:31:33.859Z"}],"details":{"listingId":"4d59c665-1035-4411-bb81-62021de431cc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/28 \\\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 instant access on 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/invoices/28"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-request data, AI, finance, or utility APIs without signup or API keys","Making micropayments in USDC on Base for individual API calls","Integrating x402-compatible agents with a multi-category API catalog"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that support x402 payment protocol on Base","Users who prefer crypto-native micropayments over subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.929Z"},"updatedAt":"2026-04-23T21:31:33.859Z"}}