{"id":"2c48f547-bbdf-4077-90b5-f611374a2ab3","shortId":"2FjCme","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com is part of a broader suite of x402-protocol APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource `/api/v1/generate/resource/21` is listed under \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network at $0.02 per call (20,000 base units with USDC's 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe provider's landing page advertises roughly 16 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 priced uniformly at $0.02 per request. The x402 challenge was successfully captured with version 1, confirming the endpoint is live.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind \"Premium API Access\" at resource/21 is not described beyond its title, making it unclear what data or service this specific endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt","No OpenAPI or schema definition found for this endpoint","The exact purpose and expected input/output of /api/v1/generate/resource/21 ('Premium API Access') is not documented anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/21","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific functionality of resource/21 is entirely undescribed. This is effectively a stub 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'/api/v1/generate/resource/21':65 '/docs':189 '/pricing':190 '/readme':193 '0.02':10,28,85,167 '000':89 '1':178 '16':124 '20':88 '6':95 'Base network API' 'USDC micropayment API' 'accept':73 'access':6,24,71,227 'across':126 'advertis':122 'ai':136 'ai/ml':55 'analysi':140 'analyt':54,130 'api':5,16,23,34,51,70,98,226 'attach':109 'avail':220 'base':8,26,82,90 'base-network' 'behind':224 'beyond':233 'broader':45 'call':87 'caller':107 'captur':175 'categori':128 'challeng':172 'classif':143 'commit':104 'confirm':179 'connect':199 'convers':159 'crypto-paid API' 'data':53,58,129,133,240 'decim':96 'describ':232 'detail':206 'document':184,215 'embed':144 'endpoint':38,125,162,181,245 'estim':154 'exact':222 'exampl':218 'exchang':149 'export':134 'extrem':186 'feed':148 'financ':145 'finance/web3':57 'four':127 'function':223 'gas':153 'gate':3,21 'generat':160 'geocod':157 'header':113 'infer':56 'infrastructur':60,156 'insight':135 'json-response' 'key':17,35,99 'land':120 'learn':138 'limit':101 'list':67 'live':183 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':137 'make':236 'metric':131 'network':83 'no-api-key' 'openapi':210 'page':121,194 'part':42 'pay':9,27 'pay-per-call API' 'pay-per-request' 'payload':219 'payment':77,112 'per':11,29,86,168 'post':74 'post-endpoint' 'premium':4,22,69,225 'premium API access' 'price':147,164 'prompt':201 'protocol':50 'provid':118 'quot':152 'rate':100,150 'render':196 'report':132 'request':12,30,75,116,169 'request/response':213 'requir':18,36,106 'resourc':64 'resource/21':229 'return':246 'rough':123 'schema':214 'sentiment':139 'servic':242 'settl':76 'simpli':108 'span':52 'spars':187 'spec':211 'specif':63,244 'success':174 'suit':46 'summar':142 'technic':205 'text':141 'titl':235 'token':151 'unclear':238 'uniform':165 'unit':91 'upfront':103 'usdc':14,32,79,93 'usdc-settlement' 'util':61 'valid':158 'version':177 'wallet':200 'web3':146 'x402':2,20,49,111,171 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':48","prices":[{"id":"af9946f9-001b-4444-bf0a-5e38b566c48c","listingId":"2c48f547-bbdf-4077-90b5-f611374a2ab3","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:28.185Z"}],"sources":[{"listingId":"2c48f547-bbdf-4077-90b5-f611374a2ab3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:28.185Z","lastSeenAt":"2026-04-24T10:32:11.013Z"}],"details":{"listingId":"2c48f547-bbdf-4077-90b5-f611374a2ab3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/21 \\\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 a valid x402 challenge with version 1, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/21"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals on Base)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/21"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/21"},{"claim":"The provider lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request infrastructure into agent workflows"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Prototyping workflows that need low-friction paid endpoints"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.832Z"},"updatedAt":"2026-04-24T10:32:11.013Z"}}