{"id":"62d8ce52-b91f-4ca9-925e-f17397528906","shortId":"vn98Tt","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 at /api/v1/payments/316 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or subscriptions are required — each request is paid individually via the X-PAYMENT header.\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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint /api/v1/payments/316 does not clearly map to any of the listed API categories. Its description is simply \"Premium API Access,\" and no documentation, request/response schema, or usage examples are available. The docs, pricing, and other pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid endpoint until further documentation is provided.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The endpoint path /api/v1/payments/316 does not correspond to any of the advertised API categories on the homepage; its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is provided.","No examples of successful responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/316","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/payments/316","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the purpose of this specific endpoint (/api/v1/payments/316) is entirely unclear. The docs and other site pages are empty beyond a wallet-connect 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'/request':13,28,151 '0.02':12,27,74,150 '000':68 '20':67 '402 payment protocol' '6':78 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,176 'actual':211 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,83,107,168,175 'avail':186 'base':8,23,51,69 'broader':103 'call':4,19,81 'caller':213 'categori':108,169 'charg':64 'classif':124 'clear':161 'connect':199 'content':205 'convers':141 'data':110,114 'decim':79 'descript':171 'doc':188 'document':179,224 'embed':125 'endpoint':55,144,157,210,221 'estim':135 'exampl':184 'exchang':130 'export':115 'feed':129 'financ':126 'gas':134 'generat':142 'geocod':139 'given':75 'header':101 'howev':154 'i.e':73 'includ':109 'individu':95 'infrastructur':137 'insight':116 'json-response' 'key':84 'know':207 'label':59 'learn':119 'limit':86 'list':146,167 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'map':162 'metric':112 'multipl':106 'network':9,24,52 'no-api-key' 'opaqu':219 'page':192 'paid':94,220 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,100 'per':3,18,36,80 'platform':6,21,39,104 'point':153 'premium':60,174 'price':128,152,189 'prompt':201 'protocol':44 'provid':226 'quot':133 'rate':85,131 'report':113 'request':37,92 'request/response':180 'requir':90 'return':196,212 'schema':181 'sentiment':120 'simpli':173 'site':195 'specif':54,156 'subscript':88 'substant':204 'summar':123 'text':122 'token':132 'treat':215 'unit':70 'usag':183 'usdc':15,30,47,72,76 'usdc-base-network' 'use':41 'util':138 'valid':140 'via':10,25,96 'wallet':200 'web3':127 'without':206 'x':99 'x-payment':98 'x402':11,26,43 'x402 API' 'x402-payment'","prices":[{"id":"48d04e26-4df3-4aa4-8643-ffe28d6a623b","listingId":"62d8ce52-b91f-4ca9-925e-f17397528906","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/payments/316","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:21.089Z"}],"sources":[{"listingId":"62d8ce52-b91f-4ca9-925e-f17397528906","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/316","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:21.089Z","lastSeenAt":"2026-04-24T00:32:11.578Z"}],"details":{"listingId":"62d8ce52-b91f-4ca9-925e-f17397528906","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/316 \\\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 endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/payments/316"},{"claim":"All listed endpoints are 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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/316"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Micropayment-based API consumption on Base L2"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Use cases requiring known, well-documented response schemas","Free or high-volume bulk API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.398Z"},"updatedAt":"2026-04-24T00:32:11.578Z"}}