{"id":"02628a47-74d6-425d-b7e4-69f08614d359","shortId":"Bsq3GF","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-30` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, 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-30` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that generic title. It does not correspond to any of the named endpoints listed on the site's landing page (which use paths like `/api/v1/...` and `/api/v2/...`). The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation beyond the landing page is essentially empty — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns. The platform's overall value proposition is clear (cheap, keyless, per-call APIs on Base), but the specifics of endpoint-30 remain opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","keyless API","crypto-paid endpoint"],"warnings":["Endpoint functionality is unknown — 'Premium API Access' is not described anywhere in the crawled content","No OpenAPI schema or request/response documentation available","The path /api/endpoint-30 does not match any of the named endpoints on the landing page","All documentation pages (/docs, /pricing, /README, /api) render only 'Connect wallet' with no content"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-30","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-30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality ('Premium API Access') is completely undefined. The docs pages are empty. This is effectively a stub 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'/api':194 '/api/endpoint-30':38,100 '/api/v1':138 '/api/v2':140 '/docs':193 '/pricing':195 '/readme':197 '/request':17,34 '0.02':16,33,84,167 '000':156 '0913':162 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':178 '0x8335':161 '20':155 '300':181 '6':171 'Base network API' 'USDC micropayment API' 'accept':149 'access':96,105 'address':177 'advertis':81 'ai/ml':58 'analyt':57 'api':6,23,54,89,104,240 'base':9,26,77,157,164,242 'base-network' 'beyond':113,185 'call':4,21,239 'challeng':143 'cheap':235 'clear':234 'collect':48 'confirm':144 'connect':203 'content':209 'correspond':120 'crypto-paid endpoint' 'data':56,61 'decim':172 'descript':220 'document':112,184 'empti':191 'endpoint':7,24,36,66,99,126,225,247 'equal':166 'essenti':190 'exact':108 'exampl':217 'finance/web3':60 'flat':83 'function':109 'generic':115 'given':168 'http-post' 'infer':59 'infrastructur':63 'instant':95 'key':90 'keyless':236 'keyless API' 'label':102 'land':132,187 'like':137 'limit':93 'list':127 'live':147 'lowpaymentfee' 'lowpaymentfee.com':43 'name':125 'network':78 'no-api-key' 'offer':46 'opaqu':250 'openapi':213 'overal':230 'page':133,188,198 'part':40 'particular':224 'path':136 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':50 'payment':70,173 'per':3,20,52,85,238 'per-cal':237 'platform':44,80,228 'post':150 'premium':5,22,103 'prompt':205 'proposit':232 'protocol':71 'rate':92 'remain':249 'render':200 'request':53,86,151 'request/response':216 'requir':152 'return':226 'schema':214 'second':182 'sent':175 'settl':12,29,72 'site':130 'span':55 'specif':98,245 'substant':208 'timeout':183 'titl':116 'unit':158 'usdc':14,31,74,160,169 'usdc-settlement' 'use':67,135 'util':64 'valu':231 'via':10,27 'wallet':204 'x402':11,28,69,142 'x402 API' 'x402-payment'","prices":[{"id":"12c48cd1-59fd-4299-82c4-6e2d40a83cd4","listingId":"02628a47-74d6-425d-b7e4-69f08614d359","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-30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:23.478Z"}],"sources":[{"listingId":"02628a47-74d6-425d-b7e4-69f08614d359","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:23.478Z","lastSeenAt":"2026-04-23T02:00:23.181Z"}],"details":{"listingId":"02628a47-74d6-425d-b7e4-69f08614d359","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms the endpoint is live, accepts POST, and requires up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-30"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-30"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/endpoint-30"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated API calls settled on Base L2 in USDC","Programmatic access to premium services with per-request billing"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where per-call pricing is economical"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:48:43.105Z"},"updatedAt":"2026-04-23T02:00:23.181Z"}}