{"id":"8824a906-4cef-4caf-bed2-fb57164b57fe","shortId":"uV7tEW","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com is an x402-protocol gated API resource (resource ID 57) described simply as \"Premium API Access.\" It accepts POST requests and requires payment via the x402 exact scheme on the Base network, settling in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required per call is 20,000 units of USDC (in 6-decimal representation, this equals $0.02 per request), with a timeout of 300 seconds.\n\nThe provider site lowpaymentfee.com hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, 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 per request with no API keys, no rate limits, and no commitments. However, this specific endpoint (/api/v1/generate/resource/57) is not explicitly listed on the homepage catalog, so its exact functionality is unclear — it may be a generic or dynamically generated resource.\n\nDocumentation is extremely thin: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is impossible to determine what data or service this resource actually provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint"],"categories":["api","crypto"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The specific resource /api/v1/generate/resource/57 is not listed in the provider's public API catalog; its purpose is unknown","No OpenAPI spec, no request schema, no response schema, and no usage examples exist","Provider site appears to be a generic x402 API marketplace with many endpoints but no substantive docs for any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/57","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what this resource does, no request/response schema, no examples, and the specific resource ID 57 is not listed on the provider's homepage catalog. This is effectively a stub 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'/api/v1/generate/resource/57':162 '/docs':191 '/pricing':193 '/readme':195 '0.02':89,145 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':70 '20':78 '300':96 '402':229 '402 payment api' '57':43 '6':84 'accept':51 'access':49 'actual':246 'ai':115 'amount':73 'analysi':119 'analyt':114 'api':5,19,39,48,111,150 'avail':220 'base':8,22,64 'base network api' 'base-network' 'broad':104 'call':12,26,76 'catalog':105,170 'challeng':231 'classif':121 'commit':157 'confirm':224 'connect':201 'content':207 'contract':69 'convers':138 'data':113,241 'decim':85 'describ':44 'determin':239 'document':186,234 'dynam':183 'embed':122 'endpoint':6,20,30,141,161,222 'equal':88 'estim':132 'exact':60,173 'exampl':219 'exchang':127 'explicit':165 'extrem':188 'feed':126 'financ':123 'function':174 'gas':131 'gate':3,17,38 'generat':139,184 'generic':181 'geocod':136 'homepag':169 'host':102 'howev':158 'id':42 'imposs':237 'infrastructur':134 'key':151 'learn':117 'limit':154 'list':143,166 'live':225 'lowpaymentfee' 'lowpaymentfee.com':32,101 'machin':116 'maximum':72 'may':178 'micropayment api' 'network':65 'openapi':211 'page':196 'pay':10,24,108 'pay per call api' 'pay-per-cal':9,23 'pay-per-request':107 'payment':56 'per':11,25,75,90,109,146 'post':52 'post-endpoint' 'premium':4,18,47 'price':125 'prompt':203 'proper':228 'protocol':37 'provid':99,247 'quot':130 'rate':128,153 'render':198 'represent':86 'request':53,91,110,147 'request/response':214 'requir':55,74 'resourc':40,41,185,245 'return':226 'schema':215 'scheme':61 'second':97 'sentiment':118 'servic':243 'settl':66 'simpli':45 'site':100 'span':112 'spec':212 'specif':160 'summar':120 'thin':189 'timeout':94 'token':129 'unclear':176 'unit':80 'usag':218 'usdc':14,28,68,82 'usdc api' 'usdc-settlement' 'util':135 'valid':137 'via':57 'wallet':202 'web3':124 'without':233 'x402':2,16,36,59,230 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':35","prices":[{"id":"e596e249-5ccc-4b26-991b-c957367ea082","listingId":"8824a906-4cef-4caf-bed2-fb57164b57fe","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:09.943Z"}],"sources":[{"listingId":"8824a906-4cef-4caf-bed2-fb57164b57fe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:09.943Z","lastSeenAt":"2026-04-23T02:30:34.980Z"}],"details":{"listingId":"8824a906-4cef-4caf-bed2-fb57164b57fe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/57 \\\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 scheme 'exact' on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/57"},{"claim":"maxAmountRequired is 20000 (USDC 6-decimal = $0.02) with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/57"},{"claim":"Provider lists APIs at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource via x402 micropayments","Agent-driven pay-per-call workflows without API key management","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need documented, well-specified API contracts before integrating","High-volume production workloads requiring SLA guarantees","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.479Z"},"updatedAt":"2026-04-23T02:30:34.980Z"}}