{"id":"1c27732f-bd09-4824-b0d2-5e1f446b5a06","shortId":"ZHNdvX","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 platform that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/accounts/163` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint being listed here (`/api/v1/accounts/163`) does not clearly map to any of the documented API categories. Its purpose is ambiguous — the description is simply \"Premium API Access\" with no further documentation, input schema, or response examples available. The docs, pricing, and other subpages returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular endpoint returns, agents should treat it as an opaque, undocumented resource.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-micropayment","json-response","post-method"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","Base USDC API","pay-per-request API","402 payment endpoint"],"warnings":["The endpoint '/api/v1/accounts/163' has no documentation explaining what it does or what data it returns.","All documentation subpages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, input schema, or response examples are available for this endpoint.","This endpoint does not correspond to any of the named APIs listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/163","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/accounts/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but the specific resource '/api/v1/accounts/163' has no documentation, no input/output schema, and no examples. The broader site lists many endpoints but docs pages are empty. The purpose of this particular endpoint is 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'/request':17,34 '0.02':16,33,91,143 '000':85 '20':84 '402 payment endpoint' '6':95 'Base USDC API' 'accept':73 'access':71,187 'advertis':100 'agent':221 'ai':10,27,112 'ambigu':180 'analysi':116 'analyt':106 'api':4,21,41,70,104,148,175,186 'avail':197 'base':7,24,59,86 'behind':49 'broader':98 'categori':102,176 'challeng':80 'classif':119 'clear':168 'commit':156 'connect':207 'content':213 'convers':136 'data':9,26,105,109 'decim':96 'descript':182 'doc':199 'document':174,191 'embed':120 'endpoint':14,31,48,63,139,161,219 'estim':130 'exampl':196 'exchang':125 'export':110 'feed':124 'financ':11,28,121 'four':101 'gas':129 'gate':3,20,44 'generat':137 'geocod':134 'given':92 'howev':158 'i.e':90 'infrastructur':132 'input':192 'insight':111 'json-response' 'key':149 'know':215 'learn':114 'limit':152 'list':67,141,163 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':113 'map':169 'metric':107 'micropay':53 'minimum':155 'network':60 'offer':8,25 'opaqu':227 'particular':218 'pay-per-request API' 'payment':79 'per':51,144 'per-request':50 'per-request-micropayment' 'platform':5,22,42,99 'post':74 'post-method' 'premium':69,185 'price':123,200 'prompt':209 'protocol':40 'purpos':178 'quot':128 'rate':126,151 'report':108 'request':52,75,145 'requir':81,157 'resourc':229 'respons':195 'return':204,220 'schema':193 'sentiment':115 'settl':54 'simpli':184 'specif':62,160 'subpag':203 'substant':212 'summar':118 'text':117 'token':127 'treat':223 'undocu':228 'unit':87 'usdc':56,89,93 'usdc-base-network' 'util':13,30,133 'valid':135 'varieti':46 'wallet':208 'web3':122 'without':214 'x402':2,19,39,78 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1cc2a878-5438-497b-8409-79dddf090768","listingId":"1c27732f-bd09-4824-b0d2-5e1f446b5a06","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/accounts/163","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:23.498Z"}],"sources":[{"listingId":"1c27732f-bd09-4824-b0d2-5e1f446b5a06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/163","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:23.498Z","lastSeenAt":"2026-04-22T12:03:26.807Z"}],"details":{"listingId":"1c27732f-bd09-4824-b0d2-5e1f446b5a06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/163 \\\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":"The x402 challenge requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/accounts/163"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making micropayment-gated requests settled on Base via USDC","Programmatic access to an undocumented 'Premium API Access' resource"],"bestFor":["Agents that can settle x402 USDC payments on Base","Developers exploring x402 protocol integrations","Low-cost per-request API consumption without signup"],"notFor":["Users needing well-documented API contracts with clear input/output schemas","Production systems requiring SLA guarantees or detailed error handling documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.384Z"},"updatedAt":"2026-04-22T12:03:26.807Z"}}