{"id":"0e148e67-e92a-4981-a93a-3ddd55c4a083","shortId":"W5c2zn","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/item/13` 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 protocol, settling payments in USDC on the Base network. The specific resource at `/api/v1/item/13` is labeled \"Premium API Access\" but its exact functionality is not documented — it does not correspond to any of the named endpoints listed on the site's landing page (analytics, AI, finance, or utility categories).\n\nPricing is $0.02 per request (the x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC, which at 6 decimals equals $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header with each request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what `/api/v1/item/13` actually returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge on POST), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","premium-api-access"],"categories":["api-marketplace","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API","Base network API","micropayment API"],"warnings":["The endpoint /api/v1/item/13 does not appear in the site's listed API catalog — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) are empty, rendering only 'Connect wallet'.","No request or response schema is available; callers cannot know what payload to send or what to expect back.","The generic name 'Premium API Access' provides no indication of what data or service is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/13","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific resource '/api/v1/item/13' is not documented anywhere on the site. No OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet'. The purpose of this particular endpoint is unknown beyond the generic label 'Premium API 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'/api/v1/item/13':36,84,214 '/docs':184 '/pricing':185 '/readme':188 '0.02':12,28,122,143 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':176 '20':132 '402':223 '6':140 'Base network API' 'USDC API' 'access':7,23,89,155 'actual':215 'address':171 'advertis':128,146 'ai':56,115 'analyt':55,114 'api':6,22,52,88,148 'attach':158 'base':9,25,78,134,178 'base-network' 'call':4,20 'caller':156 'categori':119 'challeng':127,228 'confirm':220 'connect':194 'content':200 'contract':175 'correspond':100 'data':54 'decim':141 'descript':211 'document':96,179,233 'endpoint':34,65,106,218 'equal':142 'exact':92 'expect':245 'extrem':181 'financ':59,116 'function':93 'gate':67 'header':162 'infrastructur':62 'instant':154 'key':149 'label':86 'land':112 'learn':58 'limit':152 'list':107 'live':221 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':57 'maxamountrequir':130 'micropayment API' 'name':105 'network':79 'no-api-key' 'offer':44 'openapi':204 'page':113,189 'part':38 'pay':2,18,49 'pay per call API' 'pay-per-cal':1,17 'pay-per-request':48 'payload':238 'payment':73,161,167 'per':3,13,19,29,50,123 'platform':42,145 'post':230 'premium':5,21,87 'premium-api-access' 'price':120 'prompt':196 'protocol':71 'rate':151 'render':191 'request':14,30,51,124,165 'request/response':207 'resourc':82 'respons':243 'return':216,222 'schema':208 'send':240 'sent':169 'settl':72 'simpli':157 'site':110 'span':53 'spars':182 'spec':205 'specif':81 'suit':46 'unclear':236 'unit':135 'usdc':16,32,75,137,174 'usdc-settlement' 'use':173 'util':63,118 'valid':226 'via':10,26,68 'wallet':195 'web3':60 'without':232 'x402':11,27,70,126,160,227 'x402 API' 'x402-payment'","prices":[{"id":"77531f3a-81e9-4000-8060-37ab49407e2b","listingId":"0e148e67-e92a-4981-a93a-3ddd55c4a083","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:09.815Z"}],"sources":[{"listingId":"0e148e67-e92a-4981-a93a-3ddd55c4a083","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:09.815Z","lastSeenAt":"2026-04-23T10:30:29.503Z"}],"details":{"listingId":"0e148e67-e92a-4981-a93a-3ddd55c4a083","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/13 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/13"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/13"},{"claim":"The site lists APIs at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to undocumented premium content"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Exploring micropayment-gated API ecosystems"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Applications requiring known, well-documented request/response schemas","High-volume use cases where per-call pricing may add up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.795Z"},"updatedAt":"2026-04-23T10:30:29.503Z"}}