{"id":"3c145a1e-fecf-4b71-9fca-4d09b1964c53","shortId":"hvzQFu","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/330` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). 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 listed at $0.02 per request. However, the specific endpoint probed here (`/api/v1/payments/330`) is only described as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/payments/330` endpoint actually does. The platform's concept is clear — low-fee, keyless, per-call APIs settled in USDC on Base — but the lack of documentation for this specific endpoint makes it difficult to know what you're paying for.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["payments","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payment","402 payment required"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/payments/330","The label 'Premium API Access' is generic and does not describe what data or functionality is provided","Cannot verify what the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/330","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/330","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The endpoint's purpose beyond 'Premium API Access' is 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'/api/v1/payments/330':57,173 '/docs':197 '/payments/330':228 '/pricing':199 '/readme':201 '/request':13,28 '0.02':12,27,89,164 '000':78 '0x8335':83 '20':77 '2913':84 '402 payment required' '6':94 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,180 'actual':230 'advertis':121 'ai':133 'analysi':137 'analyt':127 'api':5,20,38,61,97,123,179,245 'attach':106 'base':8,23,51,79,86,250 'base-network' 'broader':119 'call':4,19,91,244 'caller':104 'categori':124 'challeng':69 'classif':140 'clear':237 'concept':235 'confirm':70 'connect':207 'content':213 'convers':157 'crypto API payment' 'data':126,130,187 'decim':95 'describ':176 'descript':224 'difficult':262 'document':184,192,255 'embed':141 'endpoint':55,160,170,229,259 'equal':88 'estim':151 'exampl':221 'exchang':146 'export':131 'extrem':194 'fee':240 'feed':145 'financ':142 'function':189 'gas':150 'generat':158 'geocod':155 'header':111 'howev':167 'includ':125 'infrastructur':153 'insight':132 'key':98 'keyless':241 'know':264 'label':59 'lack':253 'learn':135 'limit':101 'list':162 'live':73 'low':239 'low-fe':238 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':134 'make':260 'metric':128 'multipl':122 'network':9,24,52 'no-api-key' 'openapi':217 'page':202 'pay':2,17,35,268 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,110,116 'per':3,18,36,90,165,243 'per-cal':242 'platform':6,21,39,120,233 'post':65 'post-endpoint' 'premium':60,178 'price':144 'probe':171 'prompt':209 'proof':117 'protocol':44 'quot':149 'rate':100,147 're':267 'render':204 'report':129 'request':37,66,74,166 'request/response':220 'requir':103 'return':191 'schema':218 'sentiment':136 'settl':246 'simpli':105 'spars':195 'specif':54,169,258 'substant':212 'summar':139 'text':138 'token':148 'unit':80 'usdc':15,30,47,82,92,248 'usdc-settlement' 'use':41,93 'util':154 'valid':114,156 'via':10,25 'wallet':208 'web3':143 'x':109 'x-payment':108 'x402':11,26,43,68,115 'x402 API' 'x402-payment'","prices":[{"id":"e161a16c-482e-40c3-aeaf-70e880725ffb","listingId":"3c145a1e-fecf-4b71-9fca-4d09b1964c53","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/330","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:30.763Z"}],"sources":[{"listingId":"3c145a1e-fecf-4b71-9fca-4d09b1964c53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/330","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:30.763Z","lastSeenAt":"2026-04-23T21:32:17.307Z"}],"details":{"listingId":"3c145a1e-fecf-4b71-9fca-4d09b1964c53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/330 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/330"},{"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"}],"useCases":["Programmatic access to premium API functionality paid per-call in USDC on Base","Agent-driven workflows that need keyless, instant API access without subscriptions","Demonstrating x402 payment protocol integration for pay-per-use services"],"bestFor":["Developers wanting to test x402 protocol integrations","Agents that can settle USDC payments on Base L2","Users who prefer pay-per-call pricing with no commitments or API keys"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.9Z"},"updatedAt":"2026-04-23T21:32:17.307Z"}}