{"id":"9eb4d38a-ad24-4390-85af-2e9424cb822c","shortId":"bRHU8Q","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/44` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all appear to require wallet connection and contain no visible content. Without documentation or schemas for request/response payloads, it is unclear what parameters this specific endpoint expects or what data it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are empty or wallet-gated","No request or response schema provided for /api/v1/payments/44; unclear what data this endpoint returns","The endpoint name 'Premium API Access' is generic and does not describe its function","Cannot verify what services are actually delivered behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/44","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/44","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no clarity on what this specific endpoint actually does beyond the generic label \"Premium API Access.\" The docs pages are all gated behind wallet connection with no visible 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'/api/v1/payments/44':94 '/docs':188 '/pricing':190 '/readme':192 '/request':13,28 '0.02':12,27,62,121,175 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '6':125 'Base network API' 'USDC micropayment API' 'accept':139 'access':100 'account':74 'across':45 'advertis':148 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,72,99 'appear':195 'application/json':144 'attach':82 'base':8,23,69,111,118 'base-network' 'beyond':180 'broader':146 'call':4,19 'caller':80 'challeng':105 'classif':155 'connect':199 'contain':201 'content':204 'convers':167 'crypto-paid API' 'data':46,169,223 'decim':126 'document':179,206 'embed':156 'enabl':36 'endpoint':44,55,92,138,149,219 'equal':120 'estim':164 'exact':131 'exchang':159 'expect':220 'extrem':185 'feed':158 'finance/web3':50 'gas':163 'generat':170 'geocod':165 'given':122 'header':86 'howev':178 'infer':49 'infrastructur':52 'json-api' 'key':73 'land':182 'limit':77 'list':96 'lowpaymentfee' 'lowpaymentfee.com':31 'network':9,24,70 'no-api-key' 'no-rate-limit' 'offer':40 'page':183,193 'paramet':216 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payload':211 'payment':85,128 'per':3,18,59 'platform':6,21,38,147 'point':177 'post':140 'premium':98 'premium API access' 'price':157,176 'quot':162 'rate':76,160 'request':60,89,106,141 'request/response':210 'requir':79,197 'return':102,143,225 'schema':208 'scheme':129 'second':135 'sentiment':151 'settl':64 'simpli':81 'spars':186 'specif':91,218 'summar':154 'text':153 'timeout':136 'token':161 'unclear':214 'unit':112 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'visibl':203 'wallet':198 'without':205 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ae2978c7-18ce-402b-bd6f-c79920b8f12b","listingId":"9eb4d38a-ad24-4390-85af-2e9424cb822c","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:42.877Z"}],"sources":[{"listingId":"9eb4d38a-ad24-4390-85af-2e9424cb822c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:42.877Z","lastSeenAt":"2026-04-24T03:03:26.734Z"}],"details":{"listingId":"9eb4d38a-ad24-4390-85af-2e9424cb822c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/44 \\\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":"All endpoints priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/44"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless pay-as-you-go API access"],"bestFor":["Developers wanting zero-signup API access with crypto payments","AI agents that need to autonomously purchase API calls via x402","Users who prefer pay-per-use over subscription billing"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.309Z"},"updatedAt":"2026-04-24T03:03:26.734Z"}}