{"id":"a0003814-4311-4eab-91e9-3e66ff95303d","shortId":"TCwWKY","kind":"x402","title":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It accepts POST requests and requires a per-call payment of 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equates to $0.02 per request. The endpoint is live and returns a standard 402 challenge when called without payment.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access.\n\nThis specific endpoint (/api/v1/payments/217) is labeled \"Premium API Access\" but its exact functionality beyond the generic label is not documented. No OpenAPI schema, detailed input/output documentation, or usage examples are available from the crawled pages. The docs, API, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical content.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-base-network","no-api-key","post-method"],"categories":["payments","api-gateway"],"synonyms":["pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available for this specific endpoint's functionality","All docs/pricing/README pages resolve to minimal 'Connect wallet' content with no technical details","The exact purpose of /api/v1/payments/217 is unclear — 'Premium API Access' is a generic label","Cannot verify what data or service is returned after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/217","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/217","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation on what the endpoint actually does, no input/output schema, and no examples. The 'Premium API Access' label is generic and uninformative. Docs pages are empty beyond a wallet connect 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'/request':15,32 '0.02':14,31,77,141 '000':61 '20':60 '402':88 '6':68 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,24,42,153,162 'addit':206 'advertis':98 'ai':110 'analysi':114 'analyt':104 'api':6,23,41,100,146,161,191 'avail':184 'base':9,26,62,72 'beyond':167 'broader':95 'call':4,21,57,91 'categori':101 'challeng':89 'classif':117 'coin':67 'connect':201 'content':208 'convers':134 'crawl':187 'crypto-paid API' 'data':103,107 'decim':69 'detail':177 'doc':190 'document':173,179 'embed':118 'endpoint':36,81,137,156 'equat':75 'estim':128 'exact':165 'exampl':182 'exchang':123 'export':108 'feed':122 'financ':119 'function':166 'gas':127 'generat':135 'generic':169 'geocod':132 'includ':102 'infrastructur':130 'input/output':178 'insight':109 'instant':152 'key':147 'label':159,170 'learn':112 'limit':150 'list':139 'live':83 'lowpaymentfee' 'lowpaymentfee.com':38,96 'machin':111 'metric':105 'minim':200 'multipl':99 'network':73 'no-api-key' 'openapi':175 'page':188,195 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':46,58,93 'per':3,20,56,78,142 'per-cal':55 'per-call-billing' 'platform':97 'post':50 'post-method' 'premium':5,22,40,160 'price':121,192 'prompt':203 'protocol':12,29,47 'provid':39 'quot':126 'rate':124,149 'readm':194 'report':106 'request':51,79,143 'requir':53 'resolv':197 'return':85 'schema':176 'sentiment':113 'specif':155 'standard':87 'summar':116 'technic':207 'text':115 'token':125 'unit':63 'usag':181 'usd':66 'usdc':17,34,65 'usdc-base-network' 'util':131 'valid':133 'via':10,27,43 'wallet':202 'web3':120 'without':92 'x402':11,28,45 'x402 endpoint' 'x402-payment'","prices":[{"id":"0fd47692-9667-427c-8c0b-4ae378891b7f","listingId":"a0003814-4311-4eab-91e9-3e66ff95303d","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/217","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.681Z"}],"sources":[{"listingId":"a0003814-4311-4eab-91e9-3e66ff95303d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/217","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.681Z","lastSeenAt":"2026-04-23T16:07:16.518Z"}],"details":{"listingId":"a0003814-4311-4eab-91e9-3e66ff95303d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/217 \\\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 requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/217"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/217"}],"useCases":["Programmatic access to premium API services without traditional API key registration","Agent-driven workflows that need instant, keyless API access with crypto micropayments","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with USDC on Base that need on-demand API calls","Projects exploring x402 protocol for micropayment-gated services"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based pricing models","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.742Z"},"updatedAt":"2026-04-23T16:07:16.518Z"}}