{"id":"b05ef26a-154c-4f6c-9af6-c3a3d63f2f19","shortId":"FsVU4f","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 an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are paid per request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/charges/73` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises a broad catalog of endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Payment is handled via the x402 protocol's \"exact\" scheme, settling on the Base L2 network. The 402 challenge specifies a 300-second timeout and accepts POST requests.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what any endpoint actually returns. The endpoint at `/api/v1/charges/73` has a generic name and no indication of what data or functionality it provides beyond the label \"Premium API Access.\"","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint name 'Premium API Access' is generic; actual functionality is unknown","No examples of successful responses available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/73","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/charges/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint name 'Premium API Access' is entirely generic with no indication of what it actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/charges/73':81,217 '/docs':179 '/pricing':181 '/readme':183 '/request':13,28 '0.02':12,27,107,143 '000':96 '0x8335':101 '20':95 '2913':102 '300':167 '402':90,163 '402 payment API' '6':112 'Base network API' 'USDC micropayment API' 'accept':171 'access':86,237 'across':45 'actual':212 'advertis':116 'ai/ml':48 'analysi':124 'analyt':47 'api':5,20,37,68,85,236 'base':8,23,64,97,104,159 'beyond':232 'broad':118 'call':4,19,109 'catalog':119 'challeng':91,164 'classif':127 'commit':75 'connect':189 'content':195 'convers':135 'crypto-paid API' 'data':46,137,227 'decim':113 'document':174,204 'embed':128 'enabl':36 'endpoint':44,55,79,121,211,215 'equal':106 'exact':154 'exampl':207 'exchang':131 'export':138 'extrem':176 'feed':130 'finance/web3':50 'function':229 'generic':220 'geocod':133 'handl':148 'includ':122 'indic':224 'infer':49 'json-response' 'key':69 'l2':160 'label':83,234 'limit':72 'lowpaymentfee' 'lowpaymentfee.com':31 'name':221 'network':9,24,65,161 'no-api-key' 'offer':40 'openapi':199 'page':184 'paid':57 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':146 'per':3,18,58,108 'platform':6,21,38,115 'point':145 'post':172 'post-method' 'premium':84,235 'price':129,144 'prompt':191 'protocol':152 'provid':231 'rate':71,132 'render':186 'request':59,92,173 'request/response':202 'requir':76 'return':88,213 'schema':203 'scheme':155 'second':168 'sentiment':123 'servic':53 'settl':156 'spars':177 'spec':200 'specif':78 'specifi':165 'summar':126 'text':125 'timeout':169 'unit':98 'usdc':15,30,61,100,110 'usdc-base-network' 'use':60,111 'util':52 'valid':134 'varieti':42 'via':10,25,149 'wallet':190 'x402':11,26,35,151 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"49621173-5d1c-4ff1-be8c-d60bdc246cb7","listingId":"b05ef26a-154c-4f6c-9af6-c3a3d63f2f19","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/charges/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:28.411Z"}],"sources":[{"listingId":"b05ef26a-154c-4f6c-9af6-c3a3d63f2f19","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:28.411Z","lastSeenAt":"2026-04-24T12:03:23.278Z"}],"details":{"listingId":"b05ef26a-154c-4f6c-9af6-c3a3d63f2f19","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/73 \\\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 up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/73"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/73"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.427Z"},"updatedAt":"2026-04-24T12:03:23.278Z"}}