{"id":"2adb2ffc-81b2-4259-a7fc-b63d18c61e5c","shortId":"3b3Q47","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/84` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 Base.\n\nHowever, the specific functionality behind `/api/v1/products/84` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. The endpoint is live and responds with a well-formed x402 challenge, but what data or service it actually returns upon successful payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/products/84 ('Premium API Access') is undocumented — it is unclear what data or service is returned upon successful payment.","No OpenAPI schema, request body schema, or response examples are available.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no usable content.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have publicly visible documentation to verify actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/84","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/products/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. Docs pages render only 'Connect wallet' with no content. This is effectively a stub 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'/call':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,166 'actual':218 'addit':197 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,165 'attach':91 'avail':227 'base':8,23,51,73,157 'behind':162 'beyond':170 'broader':104 'call':80 'caller':89 'categori':109 'challeng':67,211 'classif':125 'connect':192 'content':198 'convers':142 'crypto-paid endpoint' 'data':111,115,214 'doc':183 'document':169 'embed':126 'endpoint':55,145,200 'estim':136 'exampl':180 'exchang':131 'export':116 'feed':130 'financ':127 'form':209 'function':161 'gas':135 'generat':143 'geocod':140 'header':96 'howev':158 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'json-response' 'key':83 'learn':120 'limit':86 'list':58 'live':202 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'materi':228 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':176 'page':187 'pay':2,17,35 'pay-per-call API' 'pay-per-request':1,16,34 'payment':48,95,101,222 'per':3,18,36,79,150 'platform':6,21,39,105 'premium':60,164 'premium API access' 'price':129,147,184 'prompt':194 'proof':102 'protocol':44 'quot':134 'rate':85,132 'readm':186 'render':189 'report':114 'request':4,19,37,68,151 'request/response':179 'requir':88 'respond':204 'return':64,219 'schema':177 'sentiment':121 'servic':216 'settl':153 'simpli':90 'specif':54,160 'success':221 'summar':124 'text':123 'titl':172 'token':133 'unit':74 'unknown':224 'upon':220 'usdc':15,30,47,76,155 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':193 'web3':128 'well':208 'well-form':207 'x':94 'x-payment':93 'x402':11,26,43,100,210 'x402 API' 'x402-payment'","prices":[{"id":"a2af75e2-62a3-4157-9ea2-cddaca4f12c2","listingId":"2adb2ffc-81b2-4259-a7fc-b63d18c61e5c","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/products/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:12.517Z"}],"sources":[{"listingId":"2adb2ffc-81b2-4259-a7fc-b63d18c61e5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:12.517Z","lastSeenAt":"2026-04-22T05:30:31.339Z"}],"details":{"listingId":"2adb2ffc-81b2-4259-a7fc-b63d18c61e5c","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/84 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 challenge. Attach a valid X-PAYMENT header to complete.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/84"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/84"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to an x402-gated resource"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-cost micropayment experimentation ($0.02/call)"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:16:15.679Z"},"updatedAt":"2026-04-22T05:30:31.339Z"}}