{"id":"9af4f1e2-4054-4fdf-b3e6-91a76c9a0cc7","shortId":"bA9EBv","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-enabled API resources offered by the platform. The specific resource `/api/v1/generate/resource/19` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site-wide flat pricing of $0.02/call.\n\nThe broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call endpoints spanning 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 with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind `/api/v1/generate/resource/19` is not documented beyond the generic label \"Premium API Access.\" The crawled docs, pricing, and README pages returned only a \"Connect wallet\" prompt with no additional technical documentation, request/response schemas, or usage examples. Without knowing what this particular resource generates or returns, agents should treat this as an opaque endpoint until further documentation is available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["infrastructure","utility"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-request API","USDC micropayment API","Base network API","402 payment endpoint"],"warnings":["No documentation available for /api/v1/generate/resource/19 — the actual functionality is unknown","All docs/pricing/README pages return only 'Connect wallet' with no technical content","No request body schema or response schema provided","The label 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/19","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/19","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 of what this specific resource does, no request/response schema, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/call':99 '/request':13,28 '0.02':12,27,86,98,153 '000':77 '20':76 '402 payment endpoint' '6':82 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,183 'addit':199 'advertis':72,104 'agent':216 'ai':122 'analysi':126 'analyt':116 'api':6,21,42,55,158,182 'avail':228 'base':9,24,67,78 'base-network' 'behind':172 'beyond':177 'broader':101 'call':4,19,112 'catalog':107 'challeng':71 'classif':129 'commit':166 'connect':194 'consist':89 'convers':146 'crawl':185 'data':115,119 'decim':83 'doc':186 'document':176,201,226 'embed':130 'enabl':41 'endpoint':32,113,149,223 'equal':85 'estim':140 'exampl':206 'exchang':135 'export':120 'feed':134 'financ':131 'flat':95 'function':171 'gas':139 'generat':147,213 'generic':179 'geocod':144 'howev':168 'infrastructur':142 'insight':121 'key':159 'know':208 'label':53,180 'learn':124 'limit':162 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,102 'machin':123 'mani':38 'maxamountrequir':74 'metric':117 'minimum':165 'network':68 'no-api-key' 'offer':44 'one':36 'opaqu':222 'page':190 'particular':211 'pay':2,17,110 'pay-per-cal':1,16,109 'pay-per-call' 'pay-per-request API' 'payment':62 'per':3,18,87,111,154 'platform':47,103 'post':59 'post-endpoint' 'premium':5,20,54,181 'price':96,133,151,187 'prompt':196 'quot':138 'rate':136,161 'readm':189 'report':118 'request':60,88,155 'request/response':202 'requir':167 'resourc':43,50,212 'return':191,215 'schema':203 'sentiment':125 'settl':61 'site':93 'site-wid':92 'span':114 'specif':49,170 'summar':128 'technic':200 'text':127 'token':137 'treat':218 'unit':79 'usag':205 'usdc':15,30,64,81 'usdc-settlement' 'util':143 'valid':145 'via':10,25 'wallet':195 'web3':132 'wide':94,106 'without':207 'x402':11,26,40,70 'x402 premium API' 'x402-enabled':39 'x402-payment'","prices":[{"id":"0765fe51-0cd7-4c42-8363-cd2d6e0ee7c3","listingId":"9af4f1e2-4054-4fdf-b3e6-91a76c9a0cc7","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:45.219Z"}],"sources":[{"listingId":"9af4f1e2-4054-4fdf-b3e6-91a76c9a0cc7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:45.219Z","lastSeenAt":"2026-04-28T16:08:49.036Z"}],"details":{"listingId":"9af4f1e2-4054-4fdf-b3e6-91a76c9a0cc7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/19 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/19"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium generation resource via micropayment","Agent-driven workflows that need keyless, pay-as-you-go API calls","Testing x402 payment flows on Base with low-cost endpoints"],"bestFor":["Agents needing keyless API access with crypto micropayments","Developers experimenting with x402 protocol integrations","Low-cost per-call usage without subscriptions or rate limits"],"notFor":["Users who need detailed documentation or known response schemas before calling","High-volume batch processing where $0.02/call adds up significantly","Anyone requiring fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.083Z"},"updatedAt":"2026-04-28T16:08:49.036Z"}}