{"id":"101e236a-5f23-491d-b0ff-28728a5d86d8","shortId":"b5AvBU","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/endpoint-11` 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 on the platform use the x402 payment protocol, settling in USDC on the Base network. The probed endpoint returns a live 402 challenge confirming it accepts x402 payments.\n\nThe specific endpoint `/api/endpoint-11` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The endpoint accepts POST requests and has a 300-second payment timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation pages (`/docs`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas, parameter descriptions, and usage examples are unavailable. The exact capability behind this particular endpoint path remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","no-api-key"],"categories":["general","api-gateway"],"synonyms":["premium API","x402 endpoint","USDC API","Base network API","pay-per-call API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/endpoint-11 is unknown — 'Premium API Access' is a generic label with no further documentation.","All documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; integration requires trial-and-error or contacting the provider.","This endpoint path does not match any of the documented API paths listed on the homepage (e.g., /api/v1/*, /api/v2/*), raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-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/endpoint-11","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/request USDC on Base). However, the actual functionality behind '/api/endpoint-11' is completely undocumented — the title is just 'Premium API Access' with no schema, parameters, or response examples. All doc pages returned only 'Connect wallet' with no 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'/docs':185 '/pricing':186 '/readme':187 '/request':142 '0.02':12,28,132,141 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':157 '20':122 '300':166 '402':87 '6':128 'Base network API' 'USDC API' 'accept':91,160 'access':102,181 'address':148 'advertis':172 'ai':56 'amount':120 'analyt':55 'api':6,22,52,101,174 'base':9,25,79,124,151 'behind':213 'beyond':110 'call':4,20 'capabl':212 'challeng':88,116 'collect':46 'confirm':89 'connect':192 'consist':135 'content':198 'contract':155 'data':54 'decim':129 'descript':204 'detail':200 'document':109,183 'endpoint':7,23,34,65,83,96,159,216 'equal':131 'exact':105,211 'exampl':207 'financ':59 'function':106 'generic':112 'howev':182 'http-post' 'indic':117 'infrastructur':62 'instant':180 'key':175 'label':99 'learn':58 'limit':178 'live':86 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':57 'made':146 'maximum':119 'micropayment API' 'network':80 'no-api-key' 'offer':44 'page':184 'paramet':203 'part':38 'particular':215 'path':217 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':72,93,144,168 'per':3,13,19,29,50,133 'platform':42,68,138,171 'post':161 'premium':5,21,100 'premium API' 'price':143 'probe':82 'prompt':194 'protocol':73 'rate':177 'remain':218 'request':14,30,51,134,162 'request/response':201 'return':84,189 'schema':202 'second':167 'settl':74 'span':53 'specif':95 'substant':197 'timeout':169 'titl':113 'unavail':209 'unclear':219 'uniform':140 'unit':125 'usag':206 'usdc':16,32,76,127,154 'usdc-base' 'use':69,152 'util':63 'via':10,26 'wallet':193 'web3':60 'x402':11,27,71,92,115 'x402 endpoint' 'x402-payment'","prices":[{"id":"deed7c9f-4ebb-4e5a-bf3a-b494e70469be","listingId":"101e236a-5f23-491d-b0ff-28728a5d86d8","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-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":"2026-04-18T18:36:08.843Z"}],"sources":[{"listingId":"101e236a-5f23-491d-b0ff-28728a5d86d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:08.843Z","lastSeenAt":"2026-04-22T13:30:29.874Z"}],"details":{"listingId":"101e236a-5f23-491d-b0ff-28728a5d86d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-11 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/endpoint-11"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/endpoint-11"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Making programmatic calls settled in USDC on Base via x402 protocol","Agent-driven API consumption with per-call crypto micropayments"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.705Z"},"updatedAt":"2026-04-22T13:30:29.874Z"}}