{"id":"d9fc2d08-dbb5-46c7-bdb8-6933a66bb5a8","shortId":"uDPxtS","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network 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 charges 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/66) is labeled \"Premium API Access\" but its exact functionality beyond the generic label is not documented. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","Exact functionality of /api/v1/payments/66 is unknown; 'Premium API Access' is not descriptive","No OpenAPI schema or response examples available","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/66","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/66","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 request/response 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':16,34 '0.02':15,33,73,137 '000':57 '20':56 '402':84 '6':64 'Base network API' 'USDC micropayment endpoint' 'accept':51 'access':7,25,44,149,158 'addit':199 'advertis':94 'ai':106 'analysi':110 'analyt':100 'api':6,24,43,96,142,157,185 'base':9,27,58,68 'beyond':163 'broader':91 'call':4,22,87 'categori':97 'challeng':85 'charg':55 'classif':113 'coin':63 'connect':194 'content':200 'convers':130 'crawl':182 'crypto-paid API' 'data':99,103 'decim':65 'detail':176 'doc':184 'document':169,177 'embed':114 'endpoint':38,77,133,152 'equat':71 'estim':124 'exact':161 'exampl':174 'exchang':119 'export':104 'feed':118 'financ':115 'found':179 'function':162 'gas':123 'generat':131 'generic':165 'geocod':128 'includ':98 'infrastructur':126 'insight':105 'instant':148 'key':143 'label':155,166 'learn':108 'limit':146 'list':135 'live':79 'lowpaymentfee' 'lowpaymentfee.com':40,92 'machin':107 'metric':101 'multipl':95 'network':10,28,69 'no-api-key' 'openapi':171 'page':189 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':48,89 'per':3,21,74,138 'platform':93 'post':52 'post-method' 'premium':5,23,42,156 'price':117,186 'prompt':196 'protocol':13,31,49 'provid':41 'quot':122 'rate':120,145 'readm':188 'render':191 'report':102 'request':53,75,139 'request/response':173 'return':81 'schema':172 'sentiment':109 'specif':151 'standard':83 'summar':112 'text':111 'token':121 'unit':59 'usd':62 'usdc':18,36,61 'usdc-base-network' 'util':127 'valid':129 'via':11,29,45 'wallet':195 'web3':116 'without':88 'x402':12,30,47 'x402 API' 'x402-payment'","prices":[{"id":"4f6c7cb8-22e6-4885-9f8a-61db4ae335af","listingId":"d9fc2d08-dbb5-46c7-bdb8-6933a66bb5a8","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:54.439Z"}],"sources":[{"listingId":"d9fc2d08-dbb5-46c7-bdb8-6933a66bb5a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:54.439Z","lastSeenAt":"2026-04-23T09:31:18.231Z"}],"details":{"listingId":"d9fc2d08-dbb5-46c7-bdb8-6933a66bb5a8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/66 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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/66"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/66"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints via x402 protocol"],"bestFor":["Developers wanting keyless pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs","Anyone without USDC on Base network","High-volume use cases where per-call pricing may be costly at scale"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.676Z"},"updatedAt":"2026-04-23T09:31:18.231Z"}}