{"id":"5f573f45-1625-48e7-bdf8-84bd1443dfd4","shortId":"q9gxzv","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/generate/resource/114` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge shows a maxAmountRequired of 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 (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 behind `/api/v1/generate/resource/114` is not documented — the description is simply \"Premium API Access\" with no input/output schema, no examples, and no further documentation. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually generates or returns, agents should treat this as an opaque paid endpoint with uncertain utility.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","micropayment API","Base USDC API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/114 is completely undocumented","No input or output schema provided; callers cannot know what to send or expect back","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/114","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/generate/resource/114","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 of what this specific endpoint does, no input/output schema, no examples, and all doc pages are empty. The listing is effectively a 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'/request':16,32 '0.02':15,31,88,144 '000':79 '20':78 '6':84 'Base USDC API' 'accept':66 'access':44,64,174 'across':104 'actual':208 'advertis':96,102 'agent':212 'ai':9,25,114 'analysi':118 'analyt':8,24,108 'api':4,20,42,63,149,173,187 'base':7,23,52,70,80 'behind':163 'broader':100 'call':41 'categori':106 'challeng':73 'classif':121 'collect':36 'commit':157 'connect':196 'consist':91 'content':202 'convers':137 'crypto-paid API' 'data':107,111 'decim':85 'descript':169 'doc':186 'document':167,184 'embed':122 'endpoint':13,29,43,56,103,140,207,220 'equal':87 'estim':132 'exampl':180 'exchang':127 'export':112 'feed':126 'financ':10,26,123 'flat':97 'four':105 'function':162 'gas':131 'generat':138,209 'geocod':135 'howev':159 'infrastructur':134 'input/output':177 'insight':113 'json-response' 'key':150 'know':204 'learn':116 'limit':153 'list':60,142 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':115 'maxamountrequir':76 'metric':109 'micropayment API' 'minimum':156 'network':53 'offer':34 'opaqu':218 'page':191 'paid':219 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payment':48,68 'per':40,89,145 'platform':101 'post-method' 'premium':62,172 'premium API access' 'price':98,125,188 'prompt':198 'protocol':49 'quot':130 'rate':128,152 'readm':190 'report':110 'request':90,146 'requir':158 'return':193,211 'schema':178 'sentiment':117 'show':74 'simpli':171 'site':94 'specif':55,161 'substant':201 'suit':5,21 'summar':120 'text':119 'token':129 'treat':214 'uncertain':222 'unit':81 'usdc':67,83 'usdc-base' 'util':12,28,223 'valid':136 'via':45 'wallet':197 'web3':124 'without':203 'x402':2,18,47,72 'x402 API' 'x402-payable':1,17 'x402-payment'","prices":[{"id":"8ba1b1cd-52a3-4dd3-a4bc-d241563e0619","listingId":"5f573f45-1625-48e7-bdf8-84bd1443dfd4","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/generate/resource/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:14.652Z"}],"sources":[{"listingId":"5f573f45-1625-48e7-bdf8-84bd1443dfd4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:14.652Z","lastSeenAt":"2026-04-22T12:03:16.650Z"}],"details":{"listingId":"5f573f45-1625-48e7-bdf8-84bd1443dfd4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/114 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/114"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/114"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, 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 paid API endpoint without API key registration","Agent-driven pay-per-call workflows using x402 on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-use API access on Base","Low-cost per-request micropayment testing"],"notFor":["Users who need documented input/output schemas before calling","Production workloads requiring SLA guarantees or detailed documentation","Free-tier or subscription-based API consumers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.494Z"},"updatedAt":"2026-04-22T12:03:16.650Z"}}