{"id":"83fedf95-56bf-4cce-abe2-75c454040cb0","shortId":"A5qhwP","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 offers a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/37` is labeled \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\n\nThe broader platform lists 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\nDocumentation 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 schema, no request/response examples, and no description of what `/api/resource/37` specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this particular resource provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific resource /api/resource/37 has no description beyond 'Premium API Access' — its actual functionality is unknown","Cannot verify what data or service any of the listed endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/resource/37","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/37","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/resource/37 actually returns. The listing is effectively a 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'/request':18,36 '0.02':17,35,68,149 '000':74 '20':73 '402':198 '402 payment api' '6':80 'access':63 'across':108 'advertis':89 'ai':12,30,118 'ai-inference' 'analysi':122 'analyt':11,29,112 'analytics' 'api':5,23,45,62,83,158 'base':8,26,52,75 'base network api' 'broader':104 'call':4,22 'caller':90 'categori':110 'challeng':199 'classif':125 'classification' 'collect':40 'connect':167 'convers':142 'cost':65 'cover':10,28 'data':111,115,207 'decim':81 'descript':185 'detail':174 'doc':157 'document':152,202 'embed':126 'embeddings' 'enabl':44 'endpoint':46,56,107,145,192 'estim':136 'exampl':182 'exchang':131 'export':116 'extrem':154 'feed':130 'financ':13,31,127 'finance-data' 'four':109 'function':209 'gas':135 'generat':143 'geocod':140 'geocoding' 'header':102 'infrastructur':138 'insight':117 'key':84 'label':60 'learn':120 'limit':87 'list':106 'live':194 'low payment fee' 'lowpaymentfee.com':37 'machin':119 'maxamountrequir':71 'metric':113 'micropayment api' 'network':53 'no-api-key' 'offer':38 'openapi':178 'page':162 'particular':211 'pay':2,20,91 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':101 'per':3,21,69,92,150 'platform':105 'premium':61 'price':129,147,159 'prompt':169 'protocol':97 'provid':213 'quot':134 'rate':86,132 'readm':161 'render':164 'report':114 'request':70,93,151 'request/response':181 'resourc':212 'return':190,195 'schema':179 'sentiment':121 'sentiment-analysis' 'settl':47 'specif':55,189 'suit':6,24 'summar':124 'technic':173 'text':123 'text-summarization' 'thin':155 'token':133 'unclear':205 'unit':76 'usdc':9,27,49,78 'usdc api' 'usdc-base-network' 'util':15,33,139 'utility-apis' 'valid':141,197 'via':94 'wallet':168 'web3':128 'without':201 'x':100 'x-payment':99 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"629e13ff-0482-4ca6-8926-f6f78f10b2f1","listingId":"83fedf95-56bf-4cce-abe2-75c454040cb0","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:10.731Z"}],"sources":[{"listingId":"83fedf95-56bf-4cce-abe2-75c454040cb0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:10.731Z","lastSeenAt":"2026-04-23T00:31:01.511Z"}],"details":{"listingId":"83fedf95-56bf-4cce-abe2-75c454040cb0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/37 \\\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 a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/resource/37"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/resource/37"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running analytics queries and data exports with per-request USDC micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents and bots that can settle payments in USDC on Base via x402","Projects needing quick access to multiple API categories without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:36:22.915Z"},"updatedAt":"2026-04-23T00:31:01.511Z"}}