{"id":"a84c718a-a154-4ea4-9f57-639649443d32","shortId":"vDrRyg","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 provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/benefits/20` is listed under the provider's catalog but its exact functionality is not documented beyond the label \"Premium API Access.\" The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe provider's landing page lists a broad suite of sibling endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no further technical detail. Without an OpenAPI spec, request/response schemas, or usage examples, the actual behavior and output of this specific endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","premium-api"],"categories":["general","infrastructure"],"synonyms":["premium API","low fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — actual request format and response structure are unknown","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no technical content","The exact purpose and output of /api/v1/benefits/20 ('Premium API Access') is not described anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/20","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/benefits/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific functionality of '/api/v1/benefits/20' is entirely undocumented. This is effectively a stub 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'/docs':204 '/pricing':205 '/readme':206 '0.02':12,28,75,141,198 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':165 '20':135 '6':146 'Base network API' 'USDC API access' 'accept':127 'access':7,23,40,119 'actual':228 'address':157 'ai':62 'analysi':181 'analyt':61 'api':6,22,39,87,118 'base':9,25,83,137,164 'behavior':229 'beyond':114 'broad':173 'call':4,20,149 'catalog':106 'categori':58 'chain':155 'challeng':122 'charg':131 'classif':183 'commit':94 'confirm':123 'connect':210 'contract':162 'convers':191 'data':60 'decim':147 'detail':217 'document':113,202 'embed':184 'endpoint':34,51,71,98,177,235 'exact':109 'exampl':226 'exchang':187 'feed':186 'financ':65 'function':110 'generat':193 'geocod':189 'howev':201 'includ':59 'infrastructur':68 'key':88 'label':116 'land':169 'learn':64 'limit':91 'list':101,171 'live':126 'low fee API' 'lowpaymentfee.com':36 'machin':63 'mani':50 'maximum':133 'metric':178 'micropayment API' 'network':84 'no-api-key' 'offer':52 'on-chain':153 'one':48 'openapi':220 'output':231 'page':170,203 'paid':78 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':44,150 'per':3,13,19,29,76,148 'point':200 'post':128 'post-endpoint' 'premium':5,21,38,117 'premium API' 'premium-api' 'price':73,185,199 'prompt':212 'protocol':45 'provid':37,55,104,167 'rate':90,188 'remain':236 'report':179 'request':14,30,77,129 'request/response':222 'requir':95 'return':207 'schema':223 'sentiment':180 'settl':152 'sibl':176 'sinc':143 'span':57 'spec':221 'specif':97,234 'suit':174 'summar':182 'technic':216 'unclear':237 'unit':138 'usag':225 'usd':142 'usdc':16,32,80,140,144,161 'usdc-base' 'use':145,159 'util':69 'valid':190 'via':10,26,41 'wallet':211 'web3':66 'without':218 'x402':11,27,43,121 'x402 API' 'x402-payment'","prices":[{"id":"144602fa-6e1d-4d5f-a3a2-d69808a67f10","listingId":"a84c718a-a154-4ea4-9f57-639649443d32","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/benefits/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:40.779Z"}],"sources":[{"listingId":"a84c718a-a154-4ea4-9f57-639649443d32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:40.779Z","lastSeenAt":"2026-04-22T05:31:54.074Z"}],"details":{"listingId":"a84c718a-a154-4ea4-9f57-639649443d32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/20 \\\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 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/benefits/20"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/20"},{"claim":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand premium data or services without pre-registration or API keys","Programmatic access to a pay-per-call endpoint settled in USDC on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents with Base USDC wallets needing frictionless API access","Low-volume, no-commitment API consumption at $0.02/call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.25Z"},"updatedAt":"2026-04-22T05:31:54.074Z"}}