{"id":"151c75ae-00d1-4861-8f0c-61da42f1d319","shortId":"Q8AA2H","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/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 lowpaymentfee.com platform, which hosts a variety of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/106` is labeled \"Premium API Access\" but the crawled documentation does not clarify what this particular endpoint returns or what input it expects beyond a POST request with a JSON body. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation on the site 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 spec, no request/response schema, and no examples available. As a result, the actual functionality behind this endpoint is unclear and must be tested empirically.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api","payments"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of /api/v1/payments/106 ('Premium API Access') is not explained anywhere in the crawled material","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/106","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what this specific endpoint actually does. The site's docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/payments/106':103 '/docs':186 '/pricing':188 '/readme':190 '/request':13,28 '0.02':12,27,81,160 '000':156 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '0x8335':145 '20':155 '2913':146 '300':175 '6':164 'Base network API' 'USDC API access' 'accept':142 'access':7,22,38,108 'actual':219 'address':171 'ai':65 'analyt':64 'api':6,21,37,60,93,107 'avail':214 'base':9,24,89,148,157 'behind':221 'beyond':126 'bodi':133 'call':4,19 'categori':61 'challeng':136 'clarifi':115 'commit':98 'confirm':137 'connect':196 'content':202 'contract':144 'crawl':111 'data':63 'decim':165 'document':112,178 'empir':230 'endpoint':32,49,74,102,119,139,223 'exampl':213 'expect':125 'extrem':183 'financ':68 'function':220 'given':161 'host':56 'i.e':159 'includ':62 'infrastructur':71 'input':123 'json':132 'json-response' 'key':94 'label':105 'learn':67 'limit':96 'live':141 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':66 'mani':48 'maximum':152 'micropayment API' 'must':227 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':206 'page':191 'particular':118 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':84 'payment':42,153,167 'per':3,18,82 'platform':54,77 'post':128 'post-method' 'premium':5,20,36,106 'premium API' 'price':79 'prompt':198 'protocol':43 'provid':35 'rate':95 'render':193 'request':83,129 'request/response':209 'requir':99,150 'result':217 'return':120 'schema':210 'second':176 'settl':169 'site':181 'spars':184 'spec':207 'specif':101 'test':229 'timeout':177 'unclear':225 'unit':158 'usdc':15,30,86,143,162 'usdc-base' 'util':72 'varieti':58 'via':10,25,39 'wallet':197 'web3':69 'x402':11,26,41,135 'x402 endpoint' 'x402-payment'","prices":[{"id":"d3e7a75a-fb75-4d30-bc20-0901448cf8a2","listingId":"151c75ae-00d1-4861-8f0c-61da42f1d319","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:26.361Z"}],"sources":[{"listingId":"151c75ae-00d1-4861-8f0c-61da42f1d319","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:26.361Z","lastSeenAt":"2026-04-22T10:01:56.181Z"}],"details":{"listingId":"151c75ae-00d1-4861-8f0c-61da42f1d319","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/106 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/106"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/106"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","AI agents needing keyless, on-demand API access","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.892Z"},"updatedAt":"2026-04-22T10:01:56.181Z"}}