{"id":"c56a6ab7-fe49-4e4a-ba78-d4b83276c2b6","shortId":"mXCK88","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It accepts POST requests and requires payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — access is granted purely through per-call micropayments.\n\nThe specific endpoint `/api/v1/transfers/69` is listed under \"Premium API Access\" but its exact functionality is not documented beyond that label. The broader lowpaymentfee.com platform offers 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 priced at $0.02 per request.\n\nThe endpoint is live and responds with a valid x402 challenge (version 1, scheme \"exact\"). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. The response MIME type is application/json. Documentation beyond the landing page is sparse — the /docs, /api, /pricing, and /README pages all only show a \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","per-call-micropayment","usdc-base-network","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 api","pay-per-call api","micropayment api","base network api","usdc api access","lowpaymentfee","premium api"],"warnings":["No documentation available for /api/v1/transfers/69 — purpose and response format unknown","All doc pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no content","The specific function of 'transfers/69' is not explained anywhere in available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/69","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/transfers/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live with a valid x402 challenge, but there is no documentation on what the /transfers/69 endpoint actually returns, no request/response schema, and the docs pages are all empty wallet-connect prompts. The purpose of this specific endpoint is 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'/api/v1/transfers/69':98 '/docs':205 '/pricing':207 '/readme':209 '/request':16,34 '0.02':15,33,71,160 '000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':183 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '1':175 '20':58 '300':189 '6':76 'accept':51 'access':7,25,44,86,104 'addit':220 'address':182 'ai':131 'analysi':135 'analyt':125 'api':6,24,43,79,103,121 'application/json':196 'base':9,27,60,67 'base network api' 'beyond':112,198 'broader':116 'call':4,22,93 'categori':122 'challeng':173 'classif':138 'connect':215 'convers':155 'data':124,128 'decim':77 'detail':222 'document':111,197 'embed':139 'endpoint':38,97,164 'equal':70 'estim':149 'exact':107,177 'exchang':144 'export':129 'feed':143 'financ':140 'function':108 'gas':148 'generat':156 'geocod':153 'grant':88 'includ':123 'infrastructur':151 'insight':130 'json-response' 'key':80 'label':114 'land':200 'learn':133 'limit':83 'list':100 'live':166 'lowpaymentfee' 'lowpaymentfee.com':40,117 'machin':132 'maximum':186 'metric':126 'micropay':94 'micropayment api' 'mime':193 'multipl':120 'network':10,28,68 'no-api-key' 'no-rate-limit' 'offer':119 'page':201,210 'pay':2,20 'pay-per-cal':1,19 'pay-per-call api' 'payment':48,56,178 'per':3,21,72,92,161 'per-cal':91 'per-call-micropayment' 'platform':118 'post':52 'premium':5,23,42,102 'premium api' 'price':142,158 'prompt':217 'protocol':13,31,49 'provid':41 'pure':89 'quot':147 'rate':82,145 'report':127 'request':53,73,162 'requir':55,85 'respond':168 'respons':192 'scheme':176 'second':190 'sent':180 'sentiment':134 'show':213 'spars':203 'specif':96 'summar':137 'technic':221 'text':136 'timeout':187 'token':146 'type':194 'unit':61 'usdc':18,36,63,74 'usdc api access' 'usdc-base-network' 'use':75 'util':152 'valid':154,171 'version':174 'via':11,29,45 'wallet':216 'web3':141 'x402':12,30,47,172 'x402 api' 'x402-payment'","prices":[{"id":"81cc4b19-87db-4366-8859-93cb93b03f87","listingId":"c56a6ab7-fe49-4e4a-ba78-d4b83276c2b6","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/transfers/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:02.068Z"}],"sources":[{"listingId":"c56a6ab7-fe49-4e4a-ba78-d4b83276c2b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:02.068Z","lastSeenAt":"2026-04-22T04:02:12.925Z"}],"details":{"listingId":"c56a6ab7-fe49-4e4a-ba78-d4b83276c2b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/69 \\\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 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/69"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/69"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents on Base network","Integrating pay-as-you-go API access into Web3 workflows"],"bestFor":["Agents needing keyless, per-call API access","Developers who prefer crypto micropayments over subscriptions","Web3-native applications requiring on-demand data"],"notFor":["Users who need detailed documentation before integrating","High-volume use cases where per-call pricing is inefficient","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.39Z"},"updatedAt":"2026-04-22T04:02:12.925Z"}}