{"id":"9449482a-50d8-4f9d-abf5-812f45856401","shortId":"TJN59R","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/accounts/168` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments. The `maxAmountRequired` is 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe exact purpose of the `/api/v1/accounts/168` resource is not documented beyond the generic label \"Premium API Access.\" The broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response format of this specific endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","accounts endpoint"],"warnings":["The specific functionality of /api/v1/accounts/168 is not documented — 'Premium API Access' is a generic label","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no substantive content","No OpenAPI spec, request schema, or response schema available","No examples of expected input or output for this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/168","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/168","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 no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/accounts/168 is undocumented. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'0.02':10,28,82,120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':114 '20000':109 '2913':115 '300':134 '6':124 'Base network API' 'USDC API access' 'accept':101 'access':6,24,44,177 'accounts endpoint' 'actual':228 'address':130 'advertis':181 'ai':69 'analysi':190 'analyt':68 'api':5,16,23,34,43,138,176 'attach':149 'base':8,26,90,110,117 'behavior':229 'beyond':171 'broader':179 'caller':147 'categori':65 'challeng':94 'classif':193 'commit':144 'confirm':95 'connect':219 'content':225 'convers':205 'crawl':210 'data':67,186 'decim':125 'doc':213 'document':170,211 'embed':194 'endpoint':38,58,78,97,182,236 'equal':119 'estim':202 'exact':103,162 'exact-schem':102 'exchang':197 'export':187 'feed':196 'financ':72 'format':232 'gas':201 'gate':3,21 'generat':207 'generic':173 'geocod':203 'given':121 'header':154 'howev':208 'includ':66 'infrastructur':75 'insight':188 'json-response' 'key':17,35,139 'label':174 'learn':71 'limit':141 'live':99 'low payment fee' 'lowpaymentfee.com':40 'machin':70 'mani':57 'maxamountrequir':107 'metric':184 'micropayment API' 'network':91 'no-api-key' 'offer':59 'one':55 'page':212 'pay':9,27 'pay-per-call API' 'payment':48,105,126,153,159 'per':11,29,83 'per-request-billing' 'platform':62,180 'premium':4,22,42,175 'price':80,195,214 'prompt':221 'proof':160 'protocol':49 'provid':41 'purpos':163 'quot':200 'rate':140,198 'readm':215 'remain':237 'report':185 'request':12,30,84 'requir':18,36,146 'resourc':52,167 'respons':231 'return':216 'scheme':104 'second':135 'sent':128 'sentiment':189 'settl':85 'simpli':148 'span':64 'specif':51,235 'substant':224 'summar':192 'text':191 'timeout':136 'token':199 'unclear':238 'unit':111 'upfront':143 'usdc':14,32,87,113,122 'usdc-base' 'util':76 'valid':157,204 'via':45 'wallet':220 'web3':73 'x':152 'x-payment':151 'x402':2,20,47,93,158 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"6c1a1270-89ce-4285-8e01-5faf0249b2d3","listingId":"9449482a-50d8-4f9d-abf5-812f45856401","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:24.108Z"}],"sources":[{"listingId":"9449482a-50d8-4f9d-abf5-812f45856401","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:24.108Z","lastSeenAt":"2026-04-22T12:03:26.808Z"}],"details":{"listingId":"9449482a-50d8-4f9d-abf5-812f45856401","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/168 \\\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":"Endpoint returns 402 with x402 challenge, maxAmountRequired=20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/168"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/168"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless pay-per-use API access on Base","Low-volume callers who want no subscription or commitment"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call crypto settlement adds latency","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:33.36Z"},"updatedAt":"2026-04-22T12:03:26.808Z"}}