{"id":"d5d96100-2b51-4fea-83fb-0f06e395869b","shortId":"VkcUhQ","kind":"x402","title":"Pay-per-call API suite on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/endpoint-89` is listed as \"Premium API Access\" and accepts USDC payments on Base. Based on the x402 challenge, the maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's advertised flat pricing.\n\nThe broader 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality of `/api/endpoint-89` is not documented — it does not correspond to any of the named endpoints on the landing page. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The endpoint is confirmed live (402 challenge returned), but what it actually does beyond \"Premium API Access\" is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","no-api-key"],"categories":["api-marketplace","misc"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific endpoint /api/endpoint-89 is not listed among the named endpoints on the landing page — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI schema, request format, or response format is available.","No information about rate limits, uptime guarantees, or error handling is provided."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-89","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/endpoint-89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific function of /api/endpoint-89 is completely undocumented. The docs and other pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/request':19,38 '0.02':18,37,96,153 '000':87 '20':86 '402':227 '6':92 'Base network API' 'USDC API' 'accept':71 'access':50,69,238 'across':112 'actual':233 'advertis':104,110 'ai':12,31,122 'amount':83 'analysi':126 'analyt':11,30,116 'api':5,24,48,68,158,193,237 'avail':221 'base':8,27,58,75,76,88 'beyond':235 'broader':108 'call':4,23 'categori':114 'challeng':80,228 'classif':129 'collect':42 'commit':166 'confirm':225 'connect':202 'consist':99 'content':208 'convers':146 'correspond':180 'data':115,119 'decim':93 'detail':219 'doc':192 'document':176,220 'embed':130 'endpoint':16,35,49,62,111,149,186,223 'equal':95 'estim':140 'exampl':216 'exchang':135 'export':120 'feed':134 'financ':13,32,131 'flat':105 'four':113 'function':171 'gas':139 'generat':147 'geocod':144 'howev':168 'http-post' 'infrastructur':142 'insight':121 'key':159 'land':189 'learn':124 'limit':162 'list':65,151 'live':226 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'maximum':82 'metric':117 'micropayment API' 'minimum':165 'name':185 'network':59 'no-api-key' 'offer':40 'openapi':212 'page':190,197 'pay':2,21,45 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':44 'payment':54,73 'per':3,22,46,97,154 'platform':109 'premium':67,236 'price':106,133,194 'prompt':204 'protocol':55 'quot':138 'rate':136,161 'readm':196 'report':118 'request':47,98,155 'request/response':215 'requir':84,167 'return':199,229 'schema':213 'sentiment':125 'site':102 'specif':61,170 'substant':207 'suit':6,25 'summar':128 'text':127 'token':137 'unit':89 'unknown':240 'usdc':72,91 'usdc-base' 'util':15,34,143 'valid':145 'via':9,28,51 'wallet':203 'web3':132 'x402':10,29,53,79 'x402 API' 'x402-payment'","prices":[{"id":"0078cd7f-08c6-47fa-8fa2-028a90ad6e3f","listingId":"d5d96100-2b51-4fea-83fb-0f06e395869b","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/endpoint-89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:08.949Z"}],"sources":[{"listingId":"d5d96100-2b51-4fea-83fb-0f06e395869b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:08.949Z","lastSeenAt":"2026-04-22T13:30:22.095Z"}],"details":{"listingId":"d5d96100-2b51-4fea-83fb-0f06e395869b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-89 \\\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":"The site advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-89"}],"useCases":["Programmatic access to undocumented premium API functionality via x402 micropayments","Agent-driven API consumption without API key management","Pay-as-you-go API access settled in USDC on Base"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Users comfortable with crypto-native micropayment workflows"],"notFor":["Anyone needing documented, well-specified API contracts before integrating","Users who require fiat payment options or traditional API key authentication","Production systems that need SLA guarantees or detailed error handling docs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:18:31.593Z"},"updatedAt":"2026-04-22T13:30:22.095Z"}}