{"id":"04ea9647-a336-4f90-994a-d2ca62aad044","shortId":"RE7KYE","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/resource/6`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing. However, this listing covers only `/api/resource/6`, whose specific functionality is not documented beyond the generic \"Premium API Access\" label.\n\nThe endpoint is live and returned a valid x402 challenge (HTTP 402) when probed via POST. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/resource/6 is undocumented; 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema found anywhere on the site.","All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no technical content.","The broader site lists many endpoint paths (e.g. /api/v1/analytics/metrics, /api/v2/ai/sentiment) but this listing's path /api/resource/6 does not match any of them — its purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/resource/6","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/resource/6","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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind '/api/resource/6' is completely undocumented — only a generic 'Premium API Access' label is provided. The site's docs/pricing/README pages are all blank beyond a wallet-connect 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'/request':13,28,162 '0.02':12,27,86,161 '000':81 '0x8335':71 '20':80 '2913':72 '402':194 '6':91 'Base network API' 'USDC micropayment API' 'accept':62 'access':7,22,42,60,181 'across':119 'advertis':117 'ai':129 'amount':78 'analysi':133 'analyt':123 'api':6,21,40,59,94,180,208 'attach':105 'avail':237 'base':9,24,50,74,82 'beyond':176 'broader':114 'call':4,19 'caller':103 'categori':121 'challeng':192 'classif':136 'collect':34 'commit':100 'connect':217 'contract':70 'convers':153 'cover':167 'crawl':240 'crypto-paid endpoint' 'data':122,126 'decim':92 'detail':224 'doc':207 'document':175,199 'embed':137 'endpoint':41,54,118,157,184 'equal':85 'estim':147 'exampl':236 'exchang':142 'export':127 'extrem':204 'feed':141 'financ':138 'four':120 'function':172 'gas':146 'generat':154 'generic':178 'geocod':151 'header':109 'host':32 'howev':164 'http':193 'infrastructur':149 'insight':128 'key':95 'label':57,182 'learn':131 'limit':97 'list':156,166 'live':186 'lowpaymentfee' 'lowpaymentfee.com':31,115 'machin':130 'materi':241 'maximum':77 'metric':124 'network':51 'no-api-key' 'openapi':228 'page':212 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,108 'per':3,18,38,87 'platform':116 'post':63,198 'post-endpoint' 'premium':5,20,58,179 'premium API access' 'price':140,163,209 'probe':196 'prompt':219 'protocol':47 'quot':145 'rate':96,143 'readm':211 'render':214 'report':125 'request':39,64,88,112 'request/response':231 'requir':102 'return':188 'schema':232 'sentiment':132 'settl':67 'share':158 'simpli':104 'site':202 'spec':229 'specif':53,171 'summar':135 'technic':223 'text':134 'thin':205 'token':144 'unit':83 'upfront':99 'usag':235 'usdc':15,30,69,89 'usdc-base' 'use':90 'util':150 'valid':152,190 'via':10,25,43,197 'wallet':218 'web3':139 'whose':170 'x402':11,26,45,107,191 'x402 API' 'x402-payment'","prices":[{"id":"e268126e-80e2-4976-ba08-03e4007188ae","listingId":"04ea9647-a336-4f90-994a-d2ca62aad044","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/resource/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:21.666Z"}],"sources":[{"listingId":"04ea9647-a336-4f90-994a-d2ca62aad044","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:21.666Z","lastSeenAt":"2026-04-22T13:30:19.226Z"}],"details":{"listingId":"04ea9647-a336-4f90-994a-d2ca62aad044","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/6 \\\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":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/resource/6"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/6"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-as-you-go API access on Base","Low-volume callers who prefer per-request billing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:47:49.702Z"},"updatedAt":"2026-04-22T13:30:19.226Z"}}