{"id":"28f7ee8f-b501-4fb8-8d47-97486771a0b0","shortId":"h8gN9q","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints accessible via micropayments on the Base network using USDC. The specific endpoint `/api/endpoint-29` is listed as \"Premium API Access\" and accepts POST requests with payment settled in USDC on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request.\n\nThe provider's landing page advertises a broader suite of endpoints organized into 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 (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint `/api/endpoint-29` does not correspond to any of the named endpoints on the landing page, and no documentation, input/output schema, or usage examples are available for it. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does beyond the generic label \"Premium API Access,\" its practical utility is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","micropayment API","x402 endpoint","USDC API","Base network API","pay-per-call","premium API access"],"warnings":["Endpoint /api/endpoint-29 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.","No input schema, output schema, or usage examples are available.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.","The provider site lists many endpoints but provides no technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-29","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-29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the endpoint path does not match any named service on the provider's site. The docs/pricing/README pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'/request':18,36 '0.02':17,35,97,153 '000':91 '20':90 'Base network API' 'USDC API' 'accept':67 'access':47,65,229 'actual':221 'advertis':105 'ai':12,30,122 'analysi':126 'analyt':11,29,116 'api':5,23,45,64,158,200,228 'avail':195 'base':8,26,52,76,92 'beyond':223 'broader':107 'call':4,22 'categori':114 'challeng':79 'classif':129 'collect':40 'commit':166 'confirm':80 'connect':209 'content':215 'convers':145 'correspond':175 'cover':10,28 'data':115,119 'doc':199 'document':188 'embed':130 'enabl':44 'endpoint':46,58,82,110,149,171,181,220 'estim':140 'exampl':193 'exchang':135 'export':120 'feed':134 'financ':13,31,131 'four':113 'gas':139 'generat':146 'generic':225 'geocod':143 'host':38 'howev':168 'http-post' 'i.e':96 'infrastructur':142 'input/output':189 'insight':121 'json-response' 'key':159 'know':217 'label':226 'land':103,184 'learn':124 'limit':162 'list':61,148 'live':84 'low payment fee' 'lowpaymentfee.com':37 'machin':123 'maximum':88 'metric':117 'micropay':49 'micropayment API' 'minimum':165 'name':180 'network':53 'organ':111 'page':104,185,204 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request' 'payment':71 'per':3,21,98,154 'post':68 'practic':231 'premium':63,227 'premium API access' 'price':133,151,201 'prompt':211 'provid':101 'quot':138 'rate':136,161 'readm':203 'report':118 'request':69,99,155 'requir':86,167 'return':206 'schema':190 'sentiment':125 'settl':72 'specif':57,170 'substant':214 'suit':6,24,108 'summar':128 'text':127 'token':137 'unclear':234 'unit':93 'usag':192 'usdc':9,27,55,74,95 'usdc-base' 'use':54 'util':15,33,232 'valid':144 'via':48 'wallet':210 'web3':132 'without':216 'x402':43,78 'x402 endpoint' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a4cc3cbd-f770-4648-b6e5-c9baa8f7126c","listingId":"28f7ee8f-b501-4fb8-8d47-97486771a0b0","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-29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:24.354Z"}],"sources":[{"listingId":"28f7ee8f-b501-4fb8-8d47-97486771a0b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:24.354Z","lastSeenAt":"2026-04-22T12:03:17.243Z"}],"details":{"listingId":"28f7ee8f-b501-4fb8-8d47-97486771a0b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-29"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-29"},{"claim":"All listed endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider advertises endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an unspecified premium API service via x402 micropayment","Agent-driven workflows that need low-cost per-call API access without API keys","Exploring x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-call API access on Base","Low-cost micropayment API consumption"],"notFor":["Users who need documented input/output schemas before integrating","Production workloads requiring SLA guarantees or detailed documentation","Anyone needing to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.001Z"},"updatedAt":"2026-04-22T12:03:17.243Z"}}