{"id":"a9afa72d-da80-414b-86ca-f641e5354cc9","shortId":"aeJngr","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/25` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. The broader platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced uniformly at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address 0x1A2B…85F3 with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what `/api/v1/item/25` specifically returns. The endpoint's purpose must be inferred entirely from its title and the platform's general catalog context.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","micropayment"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","Base USDC API","pay-per-call API","premium API access"],"warnings":["The specific functionality of /api/v1/item/25 is completely undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec or request/response schema is available; callers cannot know what to send or expect back.","The endpoint path '/api/v1/item/25' does not match any of the named APIs listed on the homepage catalog."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/25","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/25","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 via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/item/25' actually does beyond the generic label 'Premium API Access'. The docs pages are empty wallet-connect 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'/request':13,28 '0.02':12,27,101,133 '000':122 '0x1a2b':148 '0x8335':127 '20':121 '2913':128 '300':152 '6':137 '85f3':149 'Base USDC API' 'accept':112 'access':7,22,69,163 'addit':189 'address':147 'advertis':84,162 'ai':89 'analyt':88 'api':6,21,50,68,156,175 'base':9,24,58,123,130 'beyond':77 'broader':82 'call':4,19 'catalog':223 'categori':85 'challeng':106 'confirm':107 'connect':184 'content':190 'context':224 'data':87 'decim':138 'descript':201 'doc':174 'document':76,169 'endpoint':32,64,109,208 'entir':214 'equal':132 'exact':72,144 'extrem':171 'financ':92 'function':73 'gate':165 'general':222 'generic':79 'given':134 'includ':86 'infer':213 'infrastructur':95 'key':157 'label':66 'learn':91 'limit':160 'live':111 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':90 'made':141 'micropay':168 'micropayment' 'must':211 'network':59 'no-api-key' 'offer':42 'openapi':194 'page':179 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':117,139 'per':3,18,48,102 'platform':40,83,220 'post':113 'post-endpoint' 'premium':5,20,67 'premium API access' 'price':98,176 'prompt':186 'protocol':55 'pure':166 'purpos':210 'rate':159 'readm':178 'render':181 'request':49,103,114 'request/response':197 'requir':116 'return':206 'schema':198 'scheme':145 'second':153 'settl':51 'spars':172 'spec':195 'specif':63,205 'suit':44 'timeout':154 'titl':80,217 'uniform':99 'unit':124 'usdc':15,30,61,126,135 'usdc-base' 'use':60 'util':96 'via':10,25,52,142 'wallet':185 'web3':93 'x402':11,26,54,105 'x402 micropayment API' 'x402-payment'","prices":[{"id":"916a046c-34a7-431c-8647-2f7d1a7eb2a8","listingId":"a9afa72d-da80-414b-86ca-f641e5354cc9","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:20.089Z"}],"sources":[{"listingId":"a9afa72d-da80-414b-86ca-f641e5354cc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:20.089Z","lastSeenAt":"2026-04-22T19:30:50.840Z"}],"details":{"listingId":"a9afa72d-da80-414b-86ca-f641e5354cc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/25 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/item/25"},{"claim":"The endpoint is described as 'Premium API Access' in the x402 challenge description field.","source_url":"https://lowpaymentfee.com/api/v1/item/25"},{"claim":"Documentation, API, pricing, and README pages all show only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium data or utility endpoint with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into an agent workflow without managing API keys","Testing x402 protocol micropayment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","Agents that need keyless, pay-per-request access to utility endpoints","Projects already operating on the Base L2 with USDC"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring a specific, well-documented API contract — the endpoint's exact output is unknown"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.216Z"},"updatedAt":"2026-04-22T19:30:50.840Z"}}