{"id":"da06122f-f2e3-4bdd-8841-ce1a878b0674","shortId":"NJPRgc","kind":"x402","title":"x402-gated premium API endpoint on Base network, paid per-request in USDC.","tagline":"x402-gated premium API endpoint on Base network, paid per-request in USDC.","description":"This endpoint at `/api/v1/item/29` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is handled via the x402 protocol on the Base network using USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe x402 challenge indicates a maximum amount of 20,000 units (in USDC's 6-decimal representation, this equals $0.02 per request), consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access. However, the specific functionality behind `/api/v1/item/29` is not documented on the site's landing page — it does not appear in any of the listed API categories (data, AI, finance, infrastructure). The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nWithout documentation for this specific endpoint, it is unclear what input it expects or what data it returns. The endpoint is live and responds with a valid 402 challenge, but the lack of any schema, examples, or description beyond the generic \"Premium API Access\" label makes it difficult to assess its actual utility.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-request-pricing","json-response","post-method"],"categories":["api","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-request API","USDC API","Base network API","premium API access"],"warnings":["The specific endpoint /api/v1/item/29 is not listed among the site's documented APIs — its purpose is unknown.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no content.","No input or output schema is available; callers cannot know what to send or what to expect back.","The 'Premium API Access' label is generic and does not describe actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/29","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but there is zero documentation on what /api/v1/item/29 actually does. It does not appear in the site's listed APIs. No input/output schema, no examples, and all doc pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':125 '0.02':112,124 '000':102 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':92 '20':101 '402':215 '6':107 'Base network API' 'USDC API' 'accept':72 'access':70,140,231 'across':126 'actual':239 'advertis':120,131 'ai':168 'ai/ml':57 'amount':99 'analyt':56 'api':5,20,53,69,133,165,230 'appear':159 'assess':237 'asset':91 'base':8,23,87 'base-network' 'behind':145 'beyond':226 'categori':166 'challeng':95,216 'collect':44 'connect':181 'consist':115 'content':187 'data':55,167,203 'decim':108 'descript':225 'difficult':235 'doc':172 'document':149,189 'endpoint':6,21,32,65,128,193,207 'equal':111 'exampl':223 'expect':200 'financ':169 'finance/web3':59 'flat':121 'function':144 'gate':3,18 'generic':228 'handl':80 'howev':141 'indic':96 'infer':58 'infrastructur':61,170 'input':198 'instant':139 'json':76 'json-response' 'key':134 'label':67,232 'lack':219 'land':154 'limit':137 'list':164 'live':209 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'make':233 'maximum':98 'network':9,24,88 'offer':42 'page':155,176 'paid':10,25 'part':36 'pay':50 'pay-per-request':49 'pay-per-request API' 'payment':78 'per':12,27,51,113 'per-request':11,26 'per-request-pricing' 'platform':40,130 'post':73 'post-method' 'premium':4,19,68,229 'premium API access' 'price':122,173 'prompt':183 'protocol':48,84 'rate':136 'readm':175 'represent':109 'request':13,28,52,74,114 'respond':211 'respons':77 'return':75,178,205 'schema':222 'site':118,152 'span':54 'specif':64,143,192 'substant':186 'unclear':196 'unit':103 'usdc':15,30,90,105 'usdc-payment' 'use':89 'util':62,240 'valid':214 'via':81 'wallet':182 'without':188 'x402':2,17,47,83,94 'x402 API' 'x402-gated':1,16 'x402-payment' 'x402-protocol':46","prices":[{"id":"cdfaae7d-def9-47b9-aa90-7a53e2ce57d8","listingId":"da06122f-f2e3-4bdd-8841-ce1a878b0674","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:57.899Z"}],"sources":[{"listingId":"da06122f-f2e3-4bdd-8841-ce1a878b0674","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:57.899Z","lastSeenAt":"2026-04-23T03:47:42.380Z"}],"details":{"listingId":"da06122f-f2e3-4bdd-8841-ce1a878b0674","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/29 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 maxAmountRequired of 20000 USDC units on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/29"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/29"},{"claim":"The site lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure — but /api/v1/item/29 is not among them","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without API keys or subscriptions","Integrating x402-compatible agents with pay-as-you-go endpoints","Accessing premium data or services via crypto micropayments"],"bestFor":["Developers or agents already using x402 protocol on Base","Users who want no-signup, pay-per-call API access","Crypto-native applications needing USDC-denominated API billing"],"notFor":["Users who need detailed API documentation before purchasing","Applications requiring guaranteed SLAs or support contracts","Anyone needing to know exactly what this endpoint does before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:33:57.138Z"},"updatedAt":"2026-04-23T03:47:42.380Z"}}