{"id":"14307a68-6028-458f-a7e2-7d0dd15aef1b","shortId":"V6snMt","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no upfront commitments required.\n\nThe specific endpoint at `/api/v1/generate/resource/47` is listed under \"Premium API Access.\" Its x402 challenge advertises a max cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. Payment is made via the x402 exact scheme, settling to the provider's wallet on Base.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input parameters, and response schemas for any of these endpoints remain undocumented and unverifiable from the crawl material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","No input or output schema provided; request body and response structure are unknown","The endpoint name 'Premium API Access' and path '/api/v1/generate/resource/47' give no indication of what the endpoint actually does","Cannot verify what data or service is returned for payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/47","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/generate/resource/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request parameters or response format, and all doc/pricing/README pages are empty stubs showing only 'Connect wallet'. The actual functionality behind 'Premium API Access' at resource/47 is completely 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'/request':16,32,176 '0.02':15,31,114,175 '000':104 '0x8335':109 '20':103 '6':119 'Base network API' 'USDC micropayment API' 'accept':123 'access':94 'actual':197 'addit':149 'advertis':98,148 'ai':9,25 'ai/ml':51 'analysi':153 'analyt':8,24,50 'api':4,20,39,74,93 'application/json':128 'base':7,23,70,105,111,144 'behavior':198 'broad':44 'broader':146 'challeng':97 'classif':156 'collect':45 'commit':82 'connect':188 'content':194 'convers':168 'cost':101 'crawl':215 'crypto-paid API' 'data':49,54 'decim':120 'doc':182 'document':180 'embed':157 'enabl':38 'endpoint':13,29,47,60,86,122,150,208 'equal':113 'estim':165 'exact':135 'exchang':160 'feed':159 'financ':10,26 'finance/web3':53 'gas':164 'gate':3,19 'general':56 'generat':170 'geocod':166 'howev':179 'includ':151 'infer':52 'input':199 'json-response' 'key':75 'limit':78 'list':90 'lowpaymentfee' 'lowpaymentfee.com':33 'made':131 'materi':216 'max':100 'network':71 'no-api-key' 'offer':42 'page':181 'paramet':200 'pay':63 'pay-per-call API' 'pay-per-request':62 'payment':129 'per':64,115 'platform':40,147 'point':178 'post':124 'post-method' 'premium':92 'premium API access' 'price':158,177,183 'prompt':190 'provid':140 'quot':163 'rate':77,161 'readm':184 'remain':209 'request':65,116,125 'requir':83 'respons':202 'return':127,185 'schema':203 'scheme':136 'sentiment':152 'servic':58 'settl':137 'span':48 'specif':85 'substant':193 'suit':5,21 'summar':155 'text':154 'token':162 'undocu':210 'unit':106 'unverifi':212 'upfront':81 'usdc':67,108,117 'usdc-base' 'use':66,118 'util':12,28,57 'valid':167 'via':132 'wallet':142,189 'x402':2,18,37,96,134 'x402 API' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"febb290b-93ed-42b9-bc61-20a7c56f7427","listingId":"14307a68-6028-458f-a7e2-7d0dd15aef1b","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/generate/resource/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:48.962Z"}],"sources":[{"listingId":"14307a68-6028-458f-a7e2-7d0dd15aef1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:48.962Z","lastSeenAt":"2026-04-22T10:31:12.880Z"}],"details":{"listingId":"14307a68-6028-458f-a7e2-7d0dd15aef1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/47"},{"claim":"All endpoints are priced 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 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/generate/resource/47"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Exploring x402 payment protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-request API access on Base","Low-cost prototyping of crypto-settled API consumption"],"notFor":["Production workloads requiring well-documented input/output schemas","Users who need fiat-only payment options","High-throughput batch processing where per-request crypto settlement adds overhead"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.668Z"},"updatedAt":"2026-04-22T10:31:12.880Z"}}