{"id":"0b2d9d55-0e12-4009-bb41-15b7d9ab6d28","shortId":"kda8pL","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/generate/resource/41` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 are listed at the same $0.02/request price point and settle in USDC on Base.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no actual technical documentation, request/response schemas, or usage examples. The specific functionality behind `/api/v1/generate/resource/41` (\"Premium API Access\") is not described anywhere in the crawled material, making it unclear what this particular endpoint actually returns. Callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/41 ('Premium API Access') is not described anywhere","No request or response schema is provided; callers must experiment to discover input/output formats","The platform lists many endpoint categories (AI, finance, analytics, utils) but provides zero technical detail on any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/41","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/41","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific resource (resource/41) is completely undescribed. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/generate/resource/41':58,202 '/docs':175 '/pricing':176 '/readme':179 '/request':16,32,161 '0.02':15,31,88,160 '000':79 '20':78 '6':84 'Base network API' 'USDC API' 'accept':66 'access':44,64,205 'actual':190,221 'advertis':98,116 'ai':9,25,128 'analysi':132 'analyt':8,24,122 'anywher':209 'api':4,20,42,63,92,204 'attach':101 'awar':226 'base':7,23,52,70,80,169 'base-network' 'behind':201 'broader':114 'call':41 'caller':99,223 'categori':118 'challeng':73 'classif':135 'collect':36 'connect':185 'contact':236 'convers':152 'crawl':212 'data':121,125 'decim':85 'describ':208 'document':170,192,229 'embed':136 'endpoint':13,29,43,56,120,220 'equal':87 'estim':146 'exampl':197 'exchang':141 'experiment':234 'export':126 'extrem':172 'feed':140 'financ':10,26,137 'four':117 'function':200 'gas':145 'generat':153 'geocod':150 'header':106 'http-post' 'indic':74 'infrastructur':148 'input/output':230 'insight':127 'integr':232 'key':93 'learn':130 'limit':96 'list':60,156 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':129 'make':214 'materi':213 'maxamountrequir':76 'metric':123 'micropayment API' 'network':53 'no-api-key' 'offer':34 'page':180 'particular':219 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payment':48,68,105,111 'per':40,89 'platform':115 'point':163 'premium':62,203 'premium API access' 'price':139,162 'prompt':187 'proof':112 'protocol':49 'provid':238 'quot':144 'rate':95,142 'render':182 'report':124 'request':90 'request/response':193 'requir':233 'return':222 'schema':194,231 'sentiment':131 'settl':165 'simpli':100 'spars':173 'specif':55,199 'suit':5,21 'summar':134 'technic':191 'text':133 'token':143 'unclear':216 'unit':81 'usag':196 'usdc':67,83,167 'usdc-settlement' 'util':12,28,149 'valid':109,151 'via':45 'wallet':186 'web3':138 'without':228 'x':104 'x-payment':103 'x402':2,18,47,72,110 'x402 API' 'x402-payable':1,17 'x402-payment'","prices":[{"id":"55381487-c480-40c4-915d-a1f7ff6a951a","listingId":"0b2d9d55-0e12-4009-bb41-15b7d9ab6d28","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:39.686Z"}],"sources":[{"listingId":"0b2d9d55-0e12-4009-bb41-15b7d9ab6d28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:39.686Z","lastSeenAt":"2026-04-22T13:30:31.654Z"}],"details":{"listingId":"0b2d9d55-0e12-4009-bb41-15b7d9ab6d28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/41 \\\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 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/41"},{"claim":"All endpoints are listed 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 advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call endpoint without API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC micropayments on Base","Use cases requiring keyless, per-request billing"],"notFor":["Users who need well-documented request/response schemas before integrating","High-volume workloads where $0.02/request adds up without volume discounts","Anyone needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.142Z"},"updatedAt":"2026-04-22T13:30:31.654Z"}}