{"id":"b55f7627-ad0a-4730-ad36-e355ee001783","shortId":"fxXuVE","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/products/5` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform organizes its endpoints into 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 listed endpoints share the same $0.02 per-request pricing.\n\nThe `/api/v1/products/5` endpoint itself is confirmed live via a 402 challenge. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual request/response schemas for this specific endpoint are unknown. There is no OpenAPI spec, no example payloads, and no detailed documentation available from the crawl. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, pricing, API, README) return only 'Connect wallet' with no useful content","The specific purpose of /api/v1/products/5 is not documented; 'Premium API Access' is generic","No agents.txt present; no robots.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/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/products/5","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty beyond the landing page. The purpose of `/api/v1/products/5` specifically is unclear — it could be any of the advertised services or a generic product endpoint. This is effectively a stub 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'/request':17,34 '0.02':16,33,87,164 '000':81 '20':80 '402':178 '402 payment api' '6':91 'accept':225 'access':45,72,106 'actual':198 'advertis':97 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,41,71,99 'application/json':230 'attach':109 'avail':219 'base':7,24,61,82 'base network api' 'behind':51 'beyond':182 'broader':118 'call':94 'caller':107 'categori':125 'challeng':179 'classif':140 'confirm':174 'connect':194 'convers':156 'crawl':222 'data':9,26,126,130 'decim':92 'detail':217 'doc/pricing/api':190 'document':181,218 'embed':141 'empti':188 'endpoint':14,31,50,65,122,160,171,204,224 'essenti':187 'estim':151 'exampl':213 'exchang':146 'export':131 'feed':145 'financ':11,28,142 'four':124 'gas':150 'gate':3,20,44 'generat':157 'geocod':154 'given':88 'header':113 'howev':180 'i.e':86 'infrastructure/utilities':153 'insight':132 'instant':105 'json-api' 'key':100 'land':184 'learn':135 'limit':103 'list':68,159 'live':175 'low payment fee' 'lowpaymentfee.com':35 'machin':134 'marketplac':42 'metric':128 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':210 'organ':120 'page':185,191 'pay-per-request api' 'payload':214 'payment':76,112 'per':53,93,166 'per-request':52,165 'per-request-micropayment' 'platform':5,22,96,119 'post':226 'post-method' 'premium':70 'price':144,168 'protocol':40 'quot':149 'rate':102,147 'report':129 'request':54,116,167,227 'request/response':199 'requir':74 'return':229 'schema':200 'sentiment':136 'settl':56 'share':161 'show':193 'simpli':108 'spec':211 'specif':64,203 'summar':139 'text':138 'token':148 'unit':83 'unknown':206 'usdc':58,85,89 'usdc api access' 'usdc-base' 'util':13,30 'valid':155 'varieti':48 'via':176 'wallet':195 'web3':143 'x402':2,19,39,111 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"572e12c2-69ca-4334-a5e0-ab4ab4309941","listingId":"b55f7627-ad0a-4730-ad36-e355ee001783","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/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":"2026-04-18T18:35:33.714Z"}],"sources":[{"listingId":"b55f7627-ad0a-4730-ad36-e355ee001783","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:33.714Z","lastSeenAt":"2026-04-22T15:00:38.521Z"}],"details":{"listingId":"b55f7627-ad0a-4730-ad36-e355ee001783","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/5 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/5"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/5"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and 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":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to data, AI, finance, or utility services with per-call billing","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 micropayment-gated APIs","AI agents needing keyless, pay-per-use endpoint access","Low-volume consumers who want no subscription commitment"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.374Z"},"updatedAt":"2026-04-22T15:00:38.521Z"}}