{"id":"e53a07ee-3e52-4dbc-ad3b-a991543d0ad2","shortId":"BXxdnE","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 `/api/v1/item/18` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The listed price is $0.02 per request (20,000 base units of USDC with 6 decimals), with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/item/18` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. The site lists 16 distinct API paths across four categories (analytics/metrics, AI inference, finance/crypto data, and utility services), all priced identically at $0.02 per call. However, `/api/v1/item/18` does not correspond to any of the named endpoints on the landing page, so its precise behavior is unclear. It accepts HTTP POST requests and returns `application/json`.\n\nThe x402 challenge is live and well-formed: it specifies the \"exact\" payment scheme, USDC asset contract `0x8335...2913` on Base, with a max timeout of 300 seconds. Documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. Prospective callers should be aware that without further documentation, the request body format and response schema for this specific item endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["lowpaymentfee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The endpoint '/api/v1/item/18' is not listed among the 16 named APIs on the landing page — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No request body schema or response schema is available; callers must guess the expected input format.","The generic title 'Premium API Access' provides no indication of what data or service is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/18","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/18","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 pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is undocumented. No request/response schema, no examples, and all doc pages are empty beyond a wallet-connect prompt. The endpoint path '/api/v1/item/18' doesn't match any named API on the landing page, making its purpose 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'/request':13,28 '0.02':12,27,82,148 '000':86 '0x8335':198 '16':129 '20':85 '2913':199 '300':207 '6':92 'accept':173 'access':7,22,114 'across':133 'addit':233 'ai':54,137 'analyt':53 'analytics/metrics':136 'api':6,21,50,96,113,131,219 'application/json':179 'asset':196 'awar':239 'base':9,24,76,87,201 'base network api' 'base-network' 'behavior':169 'beyond':122,210 'bodi':246 'call':4,19,150 'caller':236 'categori':135 'challeng':182 'commit':104 'connect':228 'content':234 'contract':197 'correspond':155 'data':52,140 'decim':93 'distinct':130 'doc':218 'document':121,209,243 'empti':216 'endpoint':32,63,108,161,255 'essenti':215 'exact':117,192 'financ':57 'finance/crypto':139 'form':188 'format':247 'four':134 'function':118 'gate':65 'generic':124 'howev':151 'http':174 'http-post' 'ident':146 'infer':138 'infrastructur':60 'item':254 'json-api' 'key':97 'label':111 'land':164,212 'learn':56 'limit':100 'list':79,128 'live':184 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':55 'max':204 'micropayment api' 'minimum':103 'name':160 'network':77 'no-api-key' 'offer':42 'page':165,213,223 'part':36 'path':132 'pay':2,17,47 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':46 'payment':69,193 'per':3,18,48,83,149 'platform':40 'post':175 'precis':168 'premium':5,20,112 'premium api access' 'price':80,145,220 'prompt':230 'prospect':235 'protocol':70 'rate':99 'readm':222 'render':225 'request':49,84,176,245 'requir':105 'respons':249 'return':178 'schema':250 'scheme':194 'second':208 'servic':143 'settl':71 'site':127 'span':51 'specif':107,253 'specifi':190 'suit':44 'timeout':205 'titl':125 'unclear':171 'unit':88 'unknown':257 'usdc':15,30,73,90,195 'usdc api' 'usdc-settlement' 'util':61,142 'via':10,25,66 'wallet':229 'web3':58 'well':187 'well-form':186 'without':241 'x402':11,26,68,181 'x402 api' 'x402-payment'","prices":[{"id":"0f219f0f-3e66-428b-8485-104d5c710ad3","listingId":"e53a07ee-3e52-4dbc-ad3b-a991543d0ad2","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:23.962Z"}],"sources":[{"listingId":"e53a07ee-3e52-4dbc-ad3b-a991543d0ad2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:23.962Z","lastSeenAt":"2026-04-23T15:00:44.916Z"}],"details":{"listingId":"e53a07ee-3e52-4dbc-ad3b-a991543d0ad2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/18 \\\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":"The site lists 16 API endpoints across four categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/item/18"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/18"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","Agents that can settle USDC micropayments on Base","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.908Z"},"updatedAt":"2026-04-23T15:00:44.916Z"}}