{"id":"d99c0c8c-7053-4ef3-9248-f3383ce86089","shortId":"K62DJY","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/8` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — callers simply attach an x402 payment header with each request.\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 the same $0.02/request price point.\n\nDocumentation is extremely sparse. 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 description of what `/api/v1/generate/resource/8` specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what input the POST body should contain or what output to expect.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"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'","No OpenAPI or request/response schema provided; input format and output structure are unknown","The specific purpose of /api/v1/generate/resource/8 ('Premium API Access') is not described anywhere","Many advertised endpoints (AI, finance, analytics) have no verifiable documentation or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/8","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/8","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 with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific resource endpoint does. The listing is effectively a 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'/api/v1/generate/resource/8':58,196 '/docs':166 '/pricing':168 '/readme':170 '/request':16,32,158 '0.02':15,31,88,157 '000':79 '20':78 '402':206 '6':84 'Base USDC API' 'accept':66 'access':44,64 'across':114 'advertis':112 'ai':9,25,124 'analysi':128 'analyt':8,24,118 'api':4,20,42,63,92 'attach':101 'base':7,23,52,70,80 'bodi':218 'broader':110 'call':41 'caller':99 'categori':116 'challeng':73,207 'classif':131 'collect':36 'connect':176 'contain':220 'content':182 'convers':148 'crypto-paid API' 'data':117,121 'decim':85 'descript':193 'document':161,210 'embed':132 'endpoint':13,29,43,56,113,151,200 'equal':87 'estim':142 'exampl':190 'exchang':137 'expect':225 'export':122 'extrem':163 'feed':136 'financ':10,26,133 'four':115 'gas':141 'generat':149 'geocod':146 'header':105 'indic':74 'infrastructur':144 'input':215 'insight':123 'json-response' 'key':93 'learn':126 'limit':96 'list':60,153 'live':202 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':125 'maxamountrequir':76 'metric':119 'micropayment API' 'network':53 'no-api-key' 'offer':34 'openapi':186 'output':223 'page':171 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payment':48,68,104 'per':40,89 'platform':111 'point':160 'post':217 'post-endpoint' 'premium':62 'premium API access' 'price':135,159 'prompt':178 'protocol':49 'quot':140 'rate':95,138 'report':120 'request':90,108 'request/response':189 'requir':98 'return':173,198,203 'schema':187 'sentiment':127 'simpli':100 'spars':164 'specif':55,197 'substant':181 'suit':5,21 'summar':130 'text':129 'token':139 'unclear':213 'unit':81 'usdc':67,83 'usdc-base' 'util':12,28,145 'valid':147,205 'via':45 'wallet':177 'web3':134 'without':209 'x402':2,18,47,72,103 'x402 API' 'x402-payable':1,17 'x402-payment'","prices":[{"id":"e8c38000-8643-45c7-bce5-f9fb8eb401f0","listingId":"d99c0c8c-7053-4ef3-9248-f3383ce86089","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:48.121Z"}],"sources":[{"listingId":"d99c0c8c-7053-4ef3-9248-f3383ce86089","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:48.121Z","lastSeenAt":"2026-04-22T13:30:32.032Z"}],"details":{"listingId":"d99c0c8c-7053-4ef3-9248-f3383ce86089","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/8 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/8"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Exploring x402 payment protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can autonomously pay for API calls via crypto","Use cases needing keyless, pay-as-you-go API access on Base"],"notFor":["Production workloads requiring well-documented, schema-defined APIs","Users who need fiat payment options or cannot transact on Base network","Anyone needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.688Z"},"updatedAt":"2026-04-22T13:30:32.032Z"}}