{"id":"a421af7c-cf55-4a0b-9605-6d5ab21fd8de","shortId":"v8JHuN","kind":"x402","title":"x402-gated premium API access on Base, pay-per-request with USDC.","tagline":"x402-gated premium API access on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The specific resource at `/api/v1/generate/resource/33` accepts POST requests and charges up to 20,000 units of USDC (on Base network) per call — note that the raw `maxAmountRequired` of 20000 in USDC's 6-decimal representation equals $0.02, consistent with the site's advertised flat pricing of $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-payable APIs 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 listed at $0.02/request with no API keys, no rate limits, and no commitments required — payment is handled entirely via the x402 protocol using USDC on the Base L2 network.\n\nHowever, the specific functionality of `/api/v1/generate/resource/33` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint is confirmed live (returns a valid x402 402 challenge), but what it actually generates or returns after payment is unknown from available materials.","tags":[],"capabilities":["x402-paywall","usdc-payment","base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/generate/resource/33 is entirely undocumented — what it generates or returns after payment is unknown.","All documentation pages (docs, api, pricing, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, no input/output schema, and no example requests or responses are available.","The broader platform lists many endpoints but none have detailed documentation visible without a connected wallet."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/33","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/33","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 with a valid x402 402 challenge and consistent pricing ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the actual functionality of resource/33 is completely undocumented. This is effectively a stub 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'/request':142 '0.02':77,87,141 '000':54 '20':53 '20000':69 '402':220 '6':73 'Base network API' 'USDC API' 'accept':46 'access':6,20,36,184 'actual':225 'advertis':83,94 'ai':110 'analysi':114 'analyt':104 'api':5,19,35,101,145,183,198 'avail':234 'base':8,22,59,166 'base-network' 'behind':37 'beyond':178 'broader':91 'call':62 'challeng':221 'charg':50 'classif':117 'commit':152 'confirm':214 'connect':204 'consist':78 'content':210 'convers':134 'data':103,107 'decim':74 'doc':195 'document':177 'embed':118 'endpoint':30,137,212 'entir':157 'equal':76 'estim':128 'exampl':192 'exchang':123 'export':108 'feed':122 'financ':119 'flat':84 'function':172 'gas':127 'gate':3,17 'generat':135,226 'generic':180 'geocod':132 'handl':156 'howev':169 'infrastructur':130 'insight':109 'key':146 'l2':167 'label':181 'learn':112 'limit':149 'list':139 'live':215 'lowpaymentfee' 'lowpaymentfee.com':32,92 'machin':111 'materi':235 'maxamountrequir':67 'metric':105 'micropayment API' 'network':60,168 'no-api-key' 'note':63 'openapi':188 'page':199 'pay':10,24 'pay-per-call API' 'pay-per-request':9,23 'payabl':100 'payment':154,230 'paywal':40 'per':11,25,61,88 'platform':93 'post':47 'post-endpoint' 'premium':4,18,34,182 'premium API access' 'price':85,121,196 'prompt':206 'protocol':161 'provid':33 'quot':126 'rate':124,148 'raw':66 'render':201 'report':106 'represent':75 'request':12,26,48,89 'request/response':191 'requir':153 'resourc':43 'return':216,228 'schema':189 'sentiment':113 'site':81 'span':102 'specif':42,171 'suit':96 'summar':116 'text':115 'token':125 'unit':55 'unknown':232 'usdc':14,28,57,71,163 'usdc-payment' 'use':162 'util':131 'valid':133,218 'via':158 'wallet':205 'web3':120 'x402':2,16,39,99,160,219 'x402 API' 'x402-gated':1,15 'x402-payable':98 'x402-paywall'","prices":[{"id":"c8e32be5-9ccb-4fb8-b559-8ded1b4311c6","listingId":"a421af7c-cf55-4a0b-9605-6d5ab21fd8de","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:07.520Z"}],"sources":[{"listingId":"a421af7c-cf55-4a0b-9605-6d5ab21fd8de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:07.520Z","lastSeenAt":"2026-04-24T15:01:52.261Z"}],"details":{"listingId":"a421af7c-cf55-4a0b-9605-6d5ab21fd8de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/33 \\\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 USDC units on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/33"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/33"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with a low-cost paywall endpoint","Accessing utility/generation services via crypto micropayments on Base"],"bestFor":["Agents or developers wanting keyless, pay-as-you-go API access via x402","Testing x402 protocol integrations at low cost ($0.02/call)","Scenarios where no signup or rate-limit constraints are desired"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented input/output schemas","High-volume production workloads where undocumented behavior is a risk"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.547Z"},"updatedAt":"2026-04-24T15:01:52.261Z"}}