{"id":"1223af23-cb0b-4035-bc38-077818d5e118","shortId":"PazrDw","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 resource `/api/v1/item/11` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds. The endpoint returns application/json responses.\n\nHowever, the specific functionality of `/api/v1/item/11` is not documented — it does not appear in the site's listed API catalog, which covers analytics, AI, finance, and utility endpoints. There is no OpenAPI spec, no request/response schema documentation, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint's actual behavior and expected input/output remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"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 endpoint /api/v1/item/11 does not appear in the provider's own listed API catalog — its specific functionality is unknown.","No OpenAPI spec or request/response schema is available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The actual data or service returned after payment is completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, the specific resource /api/v1/item/11 is undocumented — it doesn't appear in the site's own catalog, there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The actual functionality is 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'/request':13,28 '0.02':12,27,76,128 '0x1a2b':118 '0x8335':112 '20000':123 '2913':113 '300':137 '6':131 '85f3':119 'Base network API' 'USDC micropayment API' 'accept':103 'access':7,22,38 'actual':202 'address':117 'ai':63,167 'analyt':62,166 'api':6,21,37,88,162,186 'appear':156 'application/json':142 'base':9,24,84,115,124 'base-network' 'behavior':203 'call':4,19 'catalog':163 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':192 'content':198 'contract':111 'correspond':126 'cover':165 'crypto-paid API' 'data':61 'decim':132 'doc':183 'document':152,180 'endpoint':32,52,72,100,140,171,200 'expect':205 'financ':66,168 'function':147 'howev':144 'includ':60 'infrastructur':69 'input/output':206 'json-response' 'key':89 'learn':65 'limit':91 'list':161 'live':102 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'mani':51 'maxamountrequir':121 'network':85 'no-api-key' 'offer':53 'one':49 'openapi':175 'page':187 'paid':79 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,108,134 'per':3,18,77 'platform':56 'post':104 'post-method' 'premium':5,20,36 'premium API access' 'price':74,184 'prompt':194 'protocol':43 'provid':35 'rate':90 'remain':207 'render':189 'request':78,105 'request/response':178 'requir':94 'resourc':46 'respons':143 'return':141 'schema':179 'second':138 'settl':107 'site':159 'span':58 'spec':176 'specif':45,146 'timeout':135 'unit':125 'unknown':208 'usdc':15,30,81,110,129 'usdc-settlement' 'use':130 'util':70,170 'via':10,25,39 'wallet':193 'web3':67 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"b73905af-806c-4e96-94d0-2b90b43de5bf","listingId":"1223af23-cb0b-4035-bc38-077818d5e118","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:04.257Z"}],"sources":[{"listingId":"1223af23-cb0b-4035-bc38-077818d5e118","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:04.257Z","lastSeenAt":"2026-04-23T02:00:22.102Z"}],"details":{"listingId":"1223af23-cb0b-4035-bc38-077818d5e118","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/11 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/item/11","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns 402 with maxAmountRequired 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/11"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/11"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","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":"2026-02-27T19:19:06.666Z"},"updatedAt":"2026-04-23T02:00:22.102Z"}}