{"id":"6977ec46-3fb6-461f-9a76-649e5202bddf","shortId":"u8ubZm","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":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settling in USDC. The specific endpoint `/api/v1/item/36` is listed as \"Premium API Access\" and returns a standard x402 402 challenge when called without payment. The challenge specifies an exact-scheme payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). 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 utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the specific endpoint `/api/v1/item/36` does not clearly map to any of these named endpoints — it uses a generic item-ID path and the description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\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 spec, no request/response schema, and no examples of what this endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/item/36","The endpoint path '/api/v1/item/36' does not correspond to any of the named endpoints listed on the homepage — its actual functionality is unknown","Response content and structure are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/36","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/item/36","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 pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what /api/v1/item/36 actually returns. The generic 'Premium API Access' label and item-ID path provide no functional 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'/api/v1/item/36':59,182 '/docs':225 '/pricing':227 '/readme':229 '/request':17,34 '0.02':16,33,100,175 '000':89 '0x8335':94 '20':88 '2913':95 '402':71,264 '6':105 'Base network API' 'USDC micropayment API' 'access':65,208 'across':135 'actual':257 'advertis':133 'ai':145 'analysi':149 'analyt':139 'api':5,22,47,64,108,207 'attach':117 'base':8,25,51,90,97 'base-network' 'broader':130 'call':12,29,74 'caller':115 'captur':266 'categori':137 'challeng':72,78,265 'classif':152 'clear':185 'collect':38 'confirm':262 'connect':235 'content':241 'convers':169 'crypto-paid endpoint' 'data':138,142,215 'decim':106 'descript':203 'document':212,220,269 'embed':153 'endpoint':6,23,48,58,134,181,192,256,260 'equal':99 'estim':163 'exact':82 'exact-schem':81 'exampl':252 'exchang':158 'expect':281 'export':143 'extrem':222 'feed':157 'financ':154 'function':217 'gas':162 'gate':3,20 'generat':170 'generic':196 'geocod':167 'header':122 'host':36 'howev':178 'id':199 'infrastructur':165 'insight':144 'item':198 'item-id':197 'key':109 'learn':147 'limit':112 'list':61 'live':263 'lowpaymentfee' 'lowpaymentfee.com':35,131 'machin':146 'map':186 'metric':140 'name':191 'network':52 'no-api-key' 'openapi':245 'page':230 'path':200 'pay':10,27,44 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':43 'payload':274 'payment':76,84,121,127 'per':11,28,45,101,176 'platform':132 'premium':4,21,63,206 'premium API access' 'price':156,173 'prompt':237 'proof':128 'protocol':42 'quot':161 'rate':111,159 'render':232 'report':141 'request':46,102,177 'request/response':248 'requir':114 'respons':279 'return':67,219,258 'schema':249 'scheme':83 'send':276 'sentiment':148 'settl':53 'sever':136 'simpli':116,205 'spars':223 'spec':246 'specif':57,180 'specifi':79 'standard':69 'substant':240 'summar':151 'text':150 'token':160 'unclear':272 'unit':91 'usdc':14,31,55,93,103 'usdc-settlement' 'use':104,194 'util':166 'valid':125,168 'wallet':236 'web3':155 'without':75,268 'x':120 'x-payment':119 'x402':2,19,41,70,126 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"a6e78e08-4f6d-45fc-864b-a22ff48b5a2c","listingId":"6977ec46-3fb6-461f-9a76-649e5202bddf","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/item/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:28.889Z"}],"sources":[{"listingId":"6977ec46-3fb6-461f-9a76-649e5202bddf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:28.889Z","lastSeenAt":"2026-04-23T00:31:09.959Z"}],"details":{"listingId":"6977ec46-3fb6-461f-9a76-649e5202bddf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/36 \\\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 x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/36"},{"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 lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"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 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-request access","Use cases requiring no-signup, no-API-key access"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Applications requiring known, well-documented response schemas","High-volume use cases where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.565Z"},"updatedAt":"2026-04-23T00:31:09.959Z"}}