{"id":"844d8f8a-17d3-4d58-9ee3-4d41eb2572be","shortId":"gzTwrm","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/accounts/109` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The payment scheme is \"exact\" on the Base network with a 300-second timeout. The response MIME type is application/json.\n\nHowever, the specific functionality of the `/api/v1/accounts/109` path is unclear. It does not appear in the site's listed API catalog, which covers analytics, AI, finance, and utility endpoints. The description simply says \"Premium API Access\" without detailing what account data or resource is returned. Documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no substantive content. Without schema details or example responses, the exact input/output contract for this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/accounts/109 is not listed in the site's public API catalog — its purpose is unknown.","All documentation pages (docs, pricing, README) render only 'Connect wallet' with no substantive content.","No OpenAPI schema, input parameters, or response examples are available.","The exact data returned by this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/109","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/accounts/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/accounts/109 is undocumented. No OpenAPI schema, no example requests/responses, and all doc pages render only a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,75,119 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '20':113 '300':141 '6':124 'Base network API' 'USDC micropayment API' 'accept':104 'access':7,22,38,185 'account':189 'address':128 'ai':61,174 'analyt':60,173 'api':6,21,37,87,169,184 'appear':163 'application/json':149 'base':9,24,83,115,137 'call':4,19 'catalog':170 'categori':69 'challeng':98 'commit':94 'confirm':99 'connect':204 'content':210 'contract':220 'cover':172 'crypto-paid API' 'data':59,190 'decim':125 'descript':180 'detail':187,213 'doc':197 'document':195 'endpoint':32,52,71,101,178,223 'exact':134,218 'exampl':215 'financ':64,175 'function':153 'howev':150 'infrastructur':67 'input/output':219 'json-response' 'key':88 'learn':63 'limit':91 'list':168 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':62 'mani':51 'mime':146 'network':84,138 'no-api-key' 'no-rate-limit' 'offer':53 'one':49 'page':196 'path':46,157 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,109,131 'per':3,18,76 'platform':56 'post':105 'premium':5,20,36,183 'premium API access' 'price':73,198 'prompt':206 'protocol':43 'provid':35 'rate':90 'readm':199 'remain':224 'render':201 'request':77,106 'requir':95,108 'resourc':192 'respons':145,216 'return':194 'say':182 'schema':212 'scheme':132 'second':142 'settl':78 'simpli':181 'sinc':121 'site':166 'span':58 'specif':45,152 'substant':209 'timeout':143 'type':147 'unclear':159 'unit':116 'unknown':225 'usd':120 'usdc':15,30,80,118,122 'usdc-base-network' 'use':123 'util':68,177 'via':10,25,39 'wallet':127,205 'web3':65 'without':186,211 'x402':11,26,41,97 'x402 API' 'x402-payment'","prices":[{"id":"a3aff7e9-095a-45b5-833d-a138a04bb9ec","listingId":"844d8f8a-17d3-4d58-9ee3-4d41eb2572be","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/accounts/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:43.165Z"}],"sources":[{"listingId":"844d8f8a-17d3-4d58-9ee3-4d41eb2572be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:43.165Z","lastSeenAt":"2026-04-22T17:01:13.139Z"}],"details":{"listingId":"844d8f8a-17d3-4d58-9ee3-4d41eb2572be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/109 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/109"},{"claim":"All endpoints 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":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/109"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying per-request in USDC"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:35.361Z"},"updatedAt":"2026-04-22T17:01:13.139Z"}}