{"id":"340e58ab-8d13-4df4-8125-53e20603cb3b","shortId":"tDWQAH","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific resource at `/api/v1/generate/resource/73` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. It is one of many endpoints on the platform, all priced uniformly at $0.02 per request.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals equals $0.02 USD per call. The endpoint accepts HTTP POST requests and returns `application/json`. No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation. However, documentation is extremely thin: the docs, pricing, and API 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 usage examples available. The exact behavior of `resource/73` specifically is unknown — it may correspond to one of the listed utility or generation endpoints, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API","402 payment endpoint"],"warnings":["The exact functionality of /api/v1/generate/resource/73 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema is published.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.","The platform lists many endpoints but none have detailed documentation; treat all advertised capabilities as unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific function of resource/73 is undocumented. The docs/pricing/API pages are all blank beyond a wallet-connect 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'/request':17,34 '0.02':16,33,100,133 '000':125 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':124 '402 payment endpoint' '6':130 'Base network API' 'USDC micropayment API' 'accept':139 'access':76 'advertis':120,171 'ai/ml':59 'analysi':175 'analyt':58 'api':5,22,55,75,147,198 'application/json':145 'attach':156 'avail':225,252 'base':8,25,112,126 'base-network' 'behavior':228 'beyond':84 'broader':169 'call':12,29,136 'caller':154 'cannot':248 'challeng':119 'classif':178 'collect':46 'confirm':250 'connect':204 'contract':116 'convers':186 'correspond':236 'crypto-paid API' 'data':57,62 'decim':131 'detail':211 'doc':195 'document':83,190,220 'embed':179 'endpoint':6,23,36,92,138,172,245 'equal':132 'exact':79,227 'exampl':224 'exchang':182 'extrem':192 'feed':181 'finance/web3':61 'function':80 'gate':3,20 'generat':188,244 'geocod':184 'handl':105 'header':161 'howev':189 'http':140 'http-post' 'infer':60 'infrastructur':64 'json-response' 'key':148 'label':86 'limit':151 'list':72,241 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':91 'materi':253 'maxamountrequir':122 'may':235 'network':113 'offer':44 'one':89,238 'openapi':215 'page':199 'part':38 'pay':10,27,52 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':51 'payment':103,160,166 'per':11,28,53,101,135 'platform':42,95,170 'post':141 'premium':4,21,74 'price':97,180,196 'prompt':206 'proof':167 'protocol':50,109 'rate':150,183 'render':201 'request':54,102,142 'request/response':218 'requir':153 'resourc':68 'resource/73':230 'return':144 'schema':219 'sentiment':174 'simpli':155 'span':56 'spec':216 'specif':67,231 'summar':177 'technic':210 'text':176 'thin':193 'uniform':98 'unit':127 'unknown':233 'usag':223 'usd':134 'usdc':14,31,115 'usdc-settlement' 'use':114 'util':65,242 'valid':164,185 'via':106 'wallet':205 'x':159 'x-payment':158 'x402':2,19,49,108,165 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"1fcbb278-d93c-42f7-8843-f42e85a204a1","listingId":"340e58ab-8d13-4df4-8125-53e20603cb3b","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:06.724Z"}],"sources":[{"listingId":"340e58ab-8d13-4df4-8125-53e20603cb3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:06.724Z","lastSeenAt":"2026-04-22T21:30:34.560Z"}],"details":{"listingId":"340e58ab-8d13-4df4-8125-53e20603cb3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/73 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/73"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/73"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and 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 premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need instant, keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call crypto payments add overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.971Z"},"updatedAt":"2026-04-22T21:30:34.560Z"}}