{"id":"5990dc00-e8d9-4ae7-9507-da31570689ad","shortId":"ypaPaG","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 lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It 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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/17` is labeled \"Premium API Access\" in the x402 challenge but does not appear in the site's public API listing, which enumerates endpoints like metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more. It is unclear what data or functionality this particular payments endpoint returns — the description is generic and no schema or example response is documented. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x8335…) on Base, and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\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 usage examples available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/payments/17 is not listed among the site's publicly advertised APIs — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","The platform's advertised endpoints (analytics, AI, finance, utils) may or may not be fully functional — only this one endpoint was probed."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/17","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/payments/17","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 no documentation, no request/response schema, no examples, and the specific functionality of /api/v1/payments/17 is undescribed. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/payments/17':99 '/docs':199 '/pricing':200 '/readme':203 '0.02':12,28,75,188 '000':184 '0x8335':175 '20':183 '6':192 'Base network API' 'USDC micropayment API' 'accept':168 'access':7,23,40,104 'ai':62 'analysi':127 'analyt':61 'api':6,22,39,87,103,118 'appear':112 'avail':228 'base':9,25,83,177,185 'base-network' 'call':4,20 'categori':58 'challeng':108,165 'charg':179 'classif':130 'commit':94 'confirm':166 'connect':209 'content':215 'contract':174 'crawl':231 'crypto-paid API' 'data':60,143 'decim':193 'descript':152 'document':162,194 'embed':131 'endpoint':34,51,71,98,122,149 'enumer':121 'exampl':159,227 'exchang':134 'extrem':196 'feed':133 'financ':65 'function':145 'generic':154 'geocod':136 'given':189 'http-post' 'i.e':187 'includ':59 'infrastructur':68 'key':88 'label':101 'learn':64 'like':123 'limit':91 'list':119 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':63 'mani':50 'maximum':181 'metric':124 'network':84 'no-api-key' 'offer':52 'one':48 'openapi':219 'page':204 'particular':147 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':78 'payment':44,148 'per':3,13,19,29,76 'platform':55 'post':169 'premium':5,21,38,102 'premium API access' 'price':73,132 'prompt':211 'protocol':45 'provid':37 'public':117 'rate':90,135 'render':206 'report':125 'request':14,30,77,170 'request/response':222 'requir':95 'respons':160 'return':150 'schema':157,223 'sentiment':126 'settl':171 'site':115 'span':57 'spars':197 'spec':220 'specif':97 'summar':129 'text':128 'unclear':141 'unit':186 'usag':226 'usdc':16,32,80,173,190 'usdc-settlement' 'util':69 'via':10,26,41 'wallet':210 'web3':66 'x402':11,27,43,107,164 'x402 API' 'x402-payment'","prices":[{"id":"01715c23-21d3-4580-ab00-5fe3d8ea31d6","listingId":"5990dc00-e8d9-4ae7-9507-da31570689ad","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/payments/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.280Z"}],"sources":[{"listingId":"5990dc00-e8d9-4ae7-9507-da31570689ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.280Z","lastSeenAt":"2026-04-23T16:07:16.043Z"}],"details":{"listingId":"5990dc00-e8d9-4ae7-9507-da31570689ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/17 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/17"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units, USDC 6 decimals) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/17"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/17"},{"claim":"Platform advertises no API keys, no rate limits, instant access, $0.02/request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making one-off API calls settled instantly in USDC on Base","Agent-driven workflows that need permissionless, pay-as-you-go API access"],"bestFor":["Developers who want keyless, pay-per-request API access","AI agents with USDC wallets on Base looking for frictionless endpoint consumption","Prototyping integrations without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.194Z"},"updatedAt":"2026-04-23T16:07:16.043Z"}}