{"id":"15a29132-a92c-49b3-8aa5-09b9a46455cf","shortId":"7smkqA","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/58` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/products/58` does not clearly map to any of the named endpoints on the landing page, and no documentation, request/response schemas, or examples are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular endpoint returns, callers should treat it as an opaque premium access endpoint until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/products/58 does not match any named endpoint on the landing page; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what to expect back.","No OpenAPI spec, no examples, and no error handling documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/58","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/products/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no indication of what /api/v1/products/58 actually returns. The docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402 payment required' 'accept':46 'access':62,92,213 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,182 'attach':95 'avail':179 'base':8,23,51,73 'base network api' 'broader':104 'call':4,19,80 'caller':93,205 'categori':110 'challeng':67 'classif':125 'clear':159 'connect':191 'content':197 'convers':142 'data':111,115 'doc':181 'document':173,217 'embed':126 'endpoint':55,107,145,155,166,203,214 'estim':136 'exampl':177 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'howev':152 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'know':199 'land':169 'learn':120 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'map':160 'metric':113 'micropayment api' 'name':165 'network':9,24,52 'no-api-key' 'offer':106 'opaqu':211 'page':170,186 'particular':202 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,212 'price':129,147,183 'prompt':193 'protocol':44 'publish':219 'quot':134 'rate':88,132 'readm':185 'report':114 'request':37,68,102,151 'request/response':174 'return':64,188,204 'schema':175 'sentiment':121 'simpli':94 'specif':54,154 'substant':196 'summar':124 'text':123 'token':133 'treat':207 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':192 'web3':128 'without':198 'x402':11,26,43,66,97 'x402 api' 'x402-payment'","prices":[{"id":"399f3c53-e97b-4381-8f0c-c48a40c242a0","listingId":"15a29132-a92c-49b3-8aa5-09b9a46455cf","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/products/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:51.244Z"}],"sources":[{"listingId":"15a29132-a92c-49b3-8aa5-09b9a46455cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:51.244Z","lastSeenAt":"2026-04-22T12:03:14.414Z"}],"details":{"listingId":"15a29132-a92c-49b3-8aa5-09b9a46455cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/58 \\\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 endpoint returns an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/58"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/58"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"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, pay-as-you-go API access on Base","Exploring x402 protocol integration for automated crypto-settled API consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-call API access","Low-volume callers who want no subscription or API key overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before calling","High-volume production workloads where $0.02/request adds up without bulk discounts","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.752Z"},"updatedAt":"2026-04-22T12:03:14.414Z"}}