{"id":"42af97ee-5a30-44bb-b355-55506660e964","shortId":"E2jKKT","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/endpoint-7` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The platform advertises a flat $0.02 per request with no API keys, no rate limits, and instant access.\n\nThe specific endpoint `/api/endpoint-7` 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 (which use `/api/v1/` and `/api/v2/` path prefixes). The x402 challenge confirms it is live and accepts POST requests, paying out to a Base-network address in USDC. The `maxAmountRequired` of 20000 base units (USDC has 6 decimals) translates to $0.02, consistent with the site-wide pricing.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. Prospective callers should be aware that the actual behavior of `/api/endpoint-7` is unknown beyond the x402 payment metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","http-post"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/endpoint-7 is undocumented and does not match any named endpoint on the site","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no useful content","No OpenAPI schema or request/response examples are available","No robots.txt or agents.txt present"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-7","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/endpoint-7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint path does not match any of the named APIs on the landing page, making its purpose entirely 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'/api/v1':133 '/api/v2':135 '/request':17,34 '0.02':16,33,85,171 '20000':162 '6':167 'Base network API' 'USDC micropayment endpoint' 'accept':146 'access':97,106 'actual':225 'address':156 'advertis':82 'ai':58 'analyt':57 'api':6,23,54,90,105,185 'awar':222 'base':9,26,78,154,163 'base-network':153 'behavior':226 'beyond':231 'call':4,21 'caller':219 'challeng':140 'collect':48 'confirm':141 'connect':194 'consist':172 'content':200 'correspond':117 'data':56 'decim':168 'descript':211 'doc':184 'document':113,179 'endpoint':7,24,36,67,100,123,216 'exact':109 'exampl':208 'extrem':181 'financ':61 'flat':84 'function':110 'http-post' 'infrastructur':64 'instant':96 'key':91 'label':103 'land':129 'learn':60 'limit':94 'list':124 'live':144 'lowpaymentfee' 'lowpaymentfee.com':43 'machin':59 'maxamountrequir':160 'metadata':235 'name':122 'network':79,155 'offer':46 'openapi':204 'page':130,189 'part':40 'particular':215 'path':136 'pay':2,19,51,149 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':71,234 'per':3,20,52,86 'platform':44,81 'post':147 'prefix':137 'premium':5,22,104 'premium API access' 'price':178,186 'prompt':196 'prospect':218 'protocol':72 'rate':93 'readm':188 'render':191 'request':53,87,148 'request/response':207 'return':217 'schema':205 'settl':12,29,73 'site':127,176 'site-wid':175 'span':55 'spars':182 'specif':99 'translat':169 'unit':164 'unknown':230 'usdc':14,31,75,158,165 'usdc-settlement' 'use':68,132 'util':65 'via':10,27 'wallet':195 'web3':62 'wide':177 'x402':11,28,70,139,233 'x402 API' 'x402-payment'","prices":[{"id":"8a95a342-dc3a-4432-be72-930fb1642d3d","listingId":"42af97ee-5a30-44bb-b355-55506660e964","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/endpoint-7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:19.855Z"}],"sources":[{"listingId":"42af97ee-5a30-44bb-b355-55506660e964","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:19.855Z","lastSeenAt":"2026-04-23T02:00:22.961Z"}],"details":{"listingId":"42af97ee-5a30-44bb-b355-55506660e964","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-7 \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-7"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-7"},{"claim":"The site lists endpoints under /api/v1/ and /api/v2/ paths for analytics, AI, finance, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC on Base for per-call API access","Low-commitment, no-signup API consumption"],"notFor":["Users who need documented request/response schemas before calling","High-volume use cases where per-call pricing may add up without bulk discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:03:16.423Z"},"updatedAt":"2026-04-23T02:00:22.961Z"}}