{"id":"2082845b-81ad-4bfc-b083-881e1e8f4935","shortId":"4WBhxV","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 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/95` is listed as \"Premium API Access\" and returns an x402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers 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.\n\nThis particular endpoint (`/api/v1/products/95`) is labeled \"Premium API Access\" but the crawled material does not clarify what specific data or functionality it returns beyond that label. The endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.","The endpoint name 'Premium API Access' is generic; it is unclear what data or service this endpoint provides.","No OpenAPI spec or request/response schema is published.","No example requests or responses are available to verify functionality beyond the 402 challenge."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/95","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/95","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 documentation on what this endpoint actually returns, no request/response schema, no OpenAPI spec, and the crawled docs/pricing/README pages are all blank beyond a 'Connect wallet' prompt. The specific functionality behind 'Premium API Access' at /api/v1/products/95 is entirely 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'/request':13,28 '0.02':12,27,80,156 '000':74 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':204 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':199 '20':73 '300':207 'Base network API' 'USDC API' 'accept':46,187 'access':62,94,167 'across':115 'address':203 'advertis':85 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,87,166 'application/json':192 'attach':97 'base':8,23,51,75,201 'beyond':182 'broader':110 'call':4,19,82 'caller':95 'categori':117 'challeng':67 'clarifi':174 'classif':132 'contract':198 'convers':149 'crawl':170 'data':118,122,177 'embed':133 'endpoint':55,114,152,161,186 'estim':143 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':179 'gas':142 'generat':150 'geocod':147 'header':102 'i.e':79 'infrastructur':145 'insight':124 'instant':93 'json-response' 'key':88 'label':164,184 'learn':127 'limit':91 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31,111 'machin':126 'materi':171 'metric':120 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':113 'particular':160 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,101,107,193,209 'per':3,18,36,81,157 'platform':6,21,39,84,112 'post':188 'post-method' 'premium':60,165 'premium API access' 'price':136,154 'proof':108 'protocol':44 'quot':141 'rate':90,139 'report':121 'request':37,158,189 'requir':68 'return':64,181,191 'second':208 'sentiment':128 'settl':195 'simpli':96 'specif':54,176 'summar':131 'text':130 'timeout':210 'token':140 'unit':76 'usdc':15,30,47,78,197 'usdc-base' 'use':41 'util':146 'valid':105,148 'via':10,25 'web3':135 'x':100 'x-payment':99 'x402':11,26,43,66,106 'x402 API' 'x402-payment'","prices":[{"id":"e0165cbb-d83a-453b-93e7-eb979b249e64","listingId":"2082845b-81ad-4bfc-b083-881e1e8f4935","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:31.902Z"}],"sources":[{"listingId":"2082845b-81ad-4bfc-b083-881e1e8f4935","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:31.902Z","lastSeenAt":"2026-04-23T18:03:20.528Z"}],"details":{"listingId":"2082845b-81ad-4bfc-b083-881e1e8f4935","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/95 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/95"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/95"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.375Z"},"updatedAt":"2026-04-23T18:03:20.528Z"}}