{"id":"f7cf6f2e-fc30-4040-bd14-3fe3c3abf78c","shortId":"Pwfvwt","kind":"x402","title":"Pay-per-request premium API access on Base network via x402 protocol using USDC.","tagline":"Pay-per-request premium API access on Base network via x402 protocol using USDC.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource behind an x402 paywall. The specific endpoint `/api/v1/generate/resource/12` accepts POST requests and requires payment of up to 20,000 units of USDC (0x8335... on Base network) per call. The site advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe broader lowpaymentfee.com platform hosts multiple API categories including 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 use the x402 payment protocol on the Base network with USDC.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. The specific functionality of `/api/v1/generate/resource/12` is unclear beyond its title \"Premium API Access\" and the fact that it returns `application/json`. Without documentation or example payloads, the actual input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","post-endpoint","json-response","no-api-key"],"categories":["infrastructure","general"],"synonyms":["premium API","x402 API","USDC API","pay-per-call API","Base network API","lowpaymentfee","micropayment API","crypto-paid API"],"warnings":["Documentation pages (docs, API, pricing, README) contain no substantive content — only a 'Connect wallet' prompt","The specific purpose and input/output schema of /api/v1/generate/resource/12 are completely undocumented","The maxAmountRequired of 20000 USDC units needs clarification on decimal precision (likely 0.02 USDC given 6 decimals, but unconfirmed)","The platform appears to be a generic x402 demo or template site — actual backend functionality is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/12","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. The specific functionality, input schema, and response format of /api/v1/generate/resource/12 are unknown. No OpenAPI spec, no examples, and no meaningful docs are 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'0.02':74 '000':59 '0x8335':63 '20':58 'Base network API' 'USDC API' 'accept':49 'access':7,22,39,90,180 'across':77 'actual':194 'advertis':71 'ai':107 'analysi':111 'analyt':101 'api':6,21,38,83,97,152,179 'application/json':187 'base':9,24,65,142 'behind':41 'beyond':175 'broader':92 'call':68 'cannot':200 'categori':98 'classif':114 'connect':161 'content':167 'convers':131 'crypto-paid API' 'data':100,104 'determin':202 'doc':151 'document':146,189 'embed':115 'endpoint':32,47,80,134 'estim':125 'exampl':191 'exchang':120 'export':105 'extrem':148 'fact':183 'feed':119 'financ':116 'flat':73 'format':199 'function':170 'gas':124 'generat':132 'geocod':129 'host':95 'includ':99 'infrastructur':127 'input':195 'insight':106 'instant':89 'json-response' 'key':84 'learn':109 'limit':87 'lowpaymentfee' 'lowpaymentfee.com':34,93 'machin':108 'metric':102 'micropayment API' 'multipl':96 'network':10,25,66,143 'no-api-key' 'page':156 'paramet':196 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payload':192 'payment':54,138 'paywal':44 'per':3,18,67,75 'platform':94 'post':50 'post-endpoint' 'premium':5,20,37,178 'premium API' 'price':118,153 'prompt':163 'protocol':13,28,139 'provid':35 'quot':123 'rate':86,121 'readm':155 'render':158 'report':103 'request':4,19,51,76 'requir':53 'resourc':40 'respons':198 'return':186 'sentiment':110 'site':70 'spars':149 'specif':46,169 'substant':166 'summar':113 'text':112 'titl':177 'token':122 'unclear':174 'unit':60 'usdc':15,30,62,145 'usdc-base-network' 'use':14,29,135 'util':128 'valid':130 'via':11,26 'wallet':162 'web3':117 'without':188 'x402':12,27,43,137 'x402 API' 'x402-payment'","prices":[{"id":"3f0d0844-a4a3-4905-9a12-2f167839254b","listingId":"f7cf6f2e-fc30-4040-bd14-3fe3c3abf78c","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:01.499Z"}],"sources":[{"listingId":"f7cf6f2e-fc30-4040-bd14-3fe3c3abf78c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:01.499Z","lastSeenAt":"2026-04-22T15:00:21.825Z"}],"details":{"listingId":"f7cf6f2e-fc30-4040-bd14-3fe3c3abf78c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/12\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid payment proof to access the resource.","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 x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/12"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform hosts endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and the USDC asset is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/12"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium resource endpoint with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-use API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-request pricing may be costly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.843Z"},"updatedAt":"2026-04-22T15:00:21.825Z"}}