{"id":"bc7f3159-bef6-4ad2-a182-73e4dea95a8e","shortId":"3XJrWu","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/accounts/50` appears to be one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint is live and returns a valid x402 challenge on POST requests. Payment is settled in USDC (contract 0x8335…2913) on the Base network using the \"exact\" scheme. The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys are needed; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The timeout window is 300 seconds (5 minutes).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. The specific functionality of the `/api/v1/accounts/50` path is not documented anywhere in the crawled material; the description simply says \"Premium API Access\" without detailing what data or service is returned. Other endpoints on the same domain cover metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, but this particular accounts endpoint is not listed among them.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API access","Base network API","lowpaymentfee","accounts API"],"warnings":["The specific purpose of /api/v1/accounts/50 is not documented anywhere — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /README, /api) return only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","This endpoint is not listed among the provider's advertised API catalog on the homepage, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/50","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/accounts/50","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 challenge with clear pricing, but the specific functionality of /api/v1/accounts/50 is completely undocumented. No request/response schema, no examples, and all documentation pages render only a wallet-connect prompt. The listing is effectively a 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'/api/v1/accounts/50':47,181 '/docs':159 '/pricing':161 '/readme':163 '/request':13,28 '0.02':12,27,78,126 '000':116 '0x8335':100 '20':115 '2913':101 '300':150 '5':152 '6':121 'Base network API' 'USDC API access' 'access':7,22,38,197 'account':231 'accounts API' 'ai':67 'among':236 'amount':112 'analysi':216 'analyt':66 'anywher':186 'api':6,21,37,128,196 'appear':48 'attach':134 'base':9,24,104,117 'broad':62 'call':4,19 'caller':132 'catalog':63 'challeng':90 'classif':219 'connect':169 'content':175 'contract':99 'cover':212 'crawl':189 'data':65,201 'decim':122 'descript':192 'detail':199 'document':154,185 'domain':211 'embed':220 'endpoint':32,54,82,207,232 'equal':125 'exact':108 'exchang':223 'extrem':156 'feed':222 'financ':70 'function':178 'geocod':225 'header':139 'host':60 'infrastructur':73 'json-response' 'key':129 'learn':69 'list':235 'live':84 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53 'materi':190 'max':111 'metric':213 'minut':153 'need':131 'network':105 'no-api-key' 'offer':55 'one':51 'page':164 'particular':230 'path':46,182 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,94,138,144 'per':3,18,79 'post':92 'premium':5,20,36,195 'premium API' 'price':76,221 'prompt':171 'proof':145 'protocol':43 'provid':35,58 'rate':224 'render':166 'report':214 'request':80,93 'requir':113 'return':86,205 'say':194 'scheme':109 'second':151 'sentiment':215 'servic':203 'settl':96 'simpli':133,193 'span':64 'spars':157 'specif':45,177 'summar':218 'text':217 'timeout':147 'unit':118 'usdc':15,30,98,124 'usdc-base' 'use':106 'util':74 'valid':88,142 'via':10,25,39 'wallet':170 'web3':71 'window':148 'without':198 'x':137 'x-payment':136 'x402':11,26,41,89,143 'x402 endpoint' 'x402-payment'","prices":[{"id":"8a9d3e1b-72f9-4165-960d-a2d42a4535ad","listingId":"bc7f3159-bef6-4ad2-a182-73e4dea95a8e","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/accounts/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:46.830Z"}],"sources":[{"listingId":"bc7f3159-bef6-4ad2-a182-73e4dea95a8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:46.830Z","lastSeenAt":"2026-04-22T18:31:06.610Z"}],"details":{"listingId":"bc7f3159-bef6-4ad2-a182-73e4dea95a8e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/50 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/50"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/50"},{"claim":"The provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic account data retrieval (inferred from path)"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.014Z"},"updatedAt":"2026-04-22T18:31:06.610Z"}}