{"id":"c858f29e-70a2-4b9a-8f14-78369a83f3f3","shortId":"cg6ZXb","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 utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/invoices/5` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoint categories including 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 per call price point. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show a \"Connect wallet\" prompt), so the actual behavior and response schemas of these endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","invoice-api"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","invoice endpoint"],"warnings":["No API documentation available — all doc pages render only a 'Connect wallet' prompt with no actual content.","The specific purpose and response format of /api/v1/invoices/5 is unknown; 'Premium API Access' is a generic label.","No OpenAPI spec, no output schema, and no example responses are provided anywhere.","The platform lists many endpoint categories (AI, finance, utilities) but none have documented schemas or verifiable functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/5","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/5","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, but there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of the /api/v1/invoices/5 endpoint specifically is unclear. All documentation pages return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,64,123,173 '000':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '20':111 '300':131 'Base network API' 'USDC micropayment API' 'accept':136 'access':102 'account':76 'actual':198 'addit':146 'advertis':107,145 'ai/ml':49 'analysi':151 'analyt':48 'api':5,20,37,74,101 'application/json':141 'asset':117 'attach':84 'base':8,23,71,113,120 'base-network' 'behavior':199 'beyond':180 'broad':42 'broader':143 'call':4,19,175 'caller':82 'categori':148 'challeng':106 'classif':154 'connect':193 'convers':166 'crypto-paid API' 'data':47,52 'doc/pricing/api':188 'document':179 'embed':155 'empti':186 'enabl':36 'endpoint':45,57,94,135,147,205 'equal':122 'essenti':185 'estim':163 'exact':128 'exchang':158 'feed':157 'finance/web3':51 'gas':162 'generat':168 'geocod':164 'header':88 'howev':178 'includ':149 'infer':50 'invoice endpoint' 'invoice-api' 'json-api' 'key':75 'land':182 'limit':79 'list':98 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':109 'network':9,24,72 'no-api-key' 'offer':40 'page':183,189 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':87,125 'per':3,18,61,174 'platform':6,21,38,144 'point':177 'post':137 'premium':100 'price':156,176 'prompt':195 'quot':161 'rate':78,159 'request':62,91,138 'requir':81 'respons':201 'return':140 'schema':202 'scheme':126 'second':132 'sentiment':150 'servic':55 'set':43 'settl':66 'show':191 'simpli':83 'span':46 'specif':93 'summar':153 'text':152 'timeout':133 'token':160 'unit':114 'unknown':207 'usdc':15,30,68,116 'usdc-settlement' 'util':54 'valid':165 'via':10,25 'wallet':194 'x402':11,26,35,86,105 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a18b744a-8194-489b-b94e-cc82161ffc34","listingId":"c858f29e-70a2-4b9a-8f14-78369a83f3f3","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:37.934Z"}],"sources":[{"listingId":"c858f29e-70a2-4b9a-8f14-78369a83f3f3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:37.934Z","lastSeenAt":"2026-04-24T23:02:32.914Z"}],"details":{"listingId":"c858f29e-70a2-4b9a-8f14-78369a83f3f3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/5 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/invoices/5"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages all render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls settled instantly in USDC on Base","Programmatic invoice retrieval via pay-per-request model"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","Agents and bots that can attach x402 payment headers automatically","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or response schema guarantees before paying","High-volume consumers who need bulk pricing or subscription discounts","Developers not set up for crypto payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.385Z"},"updatedAt":"2026-04-24T23:02:32.914Z"}}