{"id":"302daade-066d-4965-84d0-996df06947d7","shortId":"ENqMdg","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network using USDC.","tagline":"Pay-per-request premium API access via x402 on Base network using USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/generate/resource/10` is listed as \"Premium API Access\" and accepts POST requests. Payment is made in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 units (likely $0.02 USDC given the 6-decimal token standard and the site's advertised $0.02/request pricing). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/generate/resource/10`) does not clearly map to any of the documented categories, and its exact functionality is not described in the available documentation.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint actually returns. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it impossible to determine the endpoint's actual purpose or output format.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api"],"synonyms":["x402 API","pay-per-request API","USDC API","Base network API","lowpaymentfee","micropayment API","crypto-paid API"],"warnings":["Endpoint functionality is completely undocumented — the actual purpose and output of /api/v1/generate/resource/10 is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No OpenAPI schema or request/response examples available","No input schema documented — unclear what POST body is expected","The endpoint path does not match any of the advertised API categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed (402 captured), confirming the endpoint exists and accepts USDC on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint is undocumented. The endpoint path '/api/v1/generate/resource/10' does not clearly correspond to any of the listed API categories on the 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'/request':95 '0.02':81,94,165 '000':78 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':71 '20':77 '6':85 'Base network API' 'USDC API' 'accept':62 'access':7,21,40,60 'across':125 'actual':235,264 'advertis':93,123 'ai':135 'amount':75 'analysi':139 'analyt':129 'api':6,20,38,59,98,203 'asset':70 'attach':107 'avail':195 'base':11,25,48 'base-network' 'broader':120 'caller':105 'categori':127,185 'challeng':239 'classif':142 'clear':178 'collect':32 'confirm':246 'connect':212 'content':218 'convers':158 'crypto-paid API' 'data':128,132 'decim':86 'describ':192 'descript':229 'determin':260 'doc':202 'document':184,196,197,255 'embed':143 'endpoint':39,52,124,161,171,234,248,262 'estim':153 'exact':188 'exampl':226 'exchang':148 'export':133 'extrem':199 'feed':147 'financ':144 'form':245 'format':268 'function':189 'gas':152 'generat':159 'geocod':156 'given':83 'header':112 'host':30 'howev':168 'http-post' 'imposs':258 'infrastructur':155 'insight':134 'key':99 'lack':253 'learn':137 'like':80 'limit':102 'list':56,173 'live':241 'lowpaymentfee' 'lowpaymentfee.com':29,121 'machin':136 'made':67 'make':256 'map':179 'maximum':74 'metric':130 'micropayment API' 'network':12,26,49 'no-api-key' 'openapi':222 'oper':250 'output':267 'page':207 'particular':233 'pay':2,16,35 'pay-per-request':1,15,34 'pay-per-request API' 'payment':44,65,111,117 'per':3,17,36,166 'platform':122 'post':63 'premium':5,19,58 'price':96,146,163,204 'prompt':214 'proof':118 'protocol':45 'purpos':265 'quot':151 'rate':101,149 'readm':206 'render':209 'report':131 'request':4,18,37,64,167 'request/response':225 'requir':104 'return':236 'schema':223 'sentiment':138 'sever':126 'simpli':106 'site':91 'spars':200 'specif':51,170 'standard':88 'substant':217 'summar':141 'text':140 'token':87,150 'unit':79 'usdc':14,28,69,82 'usdc-payment' 'use':13,27 'valid':115,157 'via':8,22,41 'wallet':213 'web3':145 'well':244 'well-form':243 'x':110 'x-payment':109 'x402':9,23,43,116,238 'x402 API' 'x402-payment'","prices":[{"id":"9c68f443-573b-4dfd-939d-d6dc9fc5de48","listingId":"302daade-066d-4965-84d0-996df06947d7","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:59.709Z"}],"sources":[{"listingId":"302daade-066d-4965-84d0-996df06947d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:59.709Z","lastSeenAt":"2026-04-23T04:00:38.638Z"}],"details":{"listingId":"302daade-066d-4965-84d0-996df06947d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/10 \\\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 x402Version 1, accepting USDC on Base network with maxAmountRequired of 20000","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/10"},{"claim":"All endpoints are priced at $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 advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agent systems that need keyless, pay-per-call API access","Low-volume consumers who prefer micropayments over subscriptions"],"notFor":["Users needing well-documented API contracts with clear input/output schemas","High-volume production workloads where $0.02/request adds up quickly","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.929Z"},"updatedAt":"2026-04-23T04:00:38.638Z"}}