{"id":"a7bf0a6f-05c3-4636-8837-212e4ecff2dd","shortId":"8sQLxV","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/92` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required. Callers attach an X-PAYMENT header to each request and are charged per use.\n\nThe wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing.\n\nThe specific functionality behind `/api/v1/keys/92` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema, and the crawled docs pages (pricing, README, /api) all resolve to a wallet-connect prompt with no additional content. Prospective users should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"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 OpenAPI or schema documentation available for this endpoint","The actual functionality of /api/v1/keys/92 ('Premium API Access') is undocumented — it is unclear what data or service it provides","Crawled /pricing, /README, and /api pages contain no useful content (only 'Connect wallet' prompts)","No example requests or responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/92","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/keys/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation of what the endpoint actually returns, and the crawled pages beyond the homepage are empty wallet-connect prompts. The specific purpose of /api/v1/keys/92 is unknown beyond its 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'/api/v1/keys/92':68,174 '/request':19,38,168 '0.02':18,37,79,167 '000':83 '20':82 '6':89 'Base network API' 'USDC micropayment API' 'access':74,183 'account':101 'actual':219 'addit':210 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,73,99,182 'attach':107 'avail':227 'awar':216 'base':8,27,63,84 'base-network' 'behavior':220 'behind':173 'beyond':178 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':127 'charg':118 'classif':142 'connect':206 'content':211 'convers':159 'cost':76 'crawl':194 'crypto-paid API' 'data':11,30,128,132 'decim':90 'doc':195 'document':177,228 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,223 'estim':153 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':172 'gas':152 'generat':160 'geocod':157 'handl':93 'header':112 'http-post' 'infrastructur':155 'insight':134 'json-response' 'key':100 'label':180 'learn':137 'list':70,162 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'network':64 'no-api-key' 'offer':10,29 'openapi':187 'page':196 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,111 'per':3,22,55,80,119 'platform':6,25,46,123 'premium':72,181 'premium API access' 'price':146,169,197 'prompt':207 'prospect':212 'protocol':97 'provid':48 'quot':151 'rate':149 'readm':198 'report':131 'request':56,115 'request/response':190 'requir':105 'resolv':201 'schema':191 'sentiment':138 'settl':58 'share':164 'spec':188 'specif':66,171 'subscript':103 'summar':141 'text':140 'token':150 'unclear':225 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'use':120 'user':213 'util':15,34,156 'valid':158 'via':94 'wallet':205 'wallet-connect':204 'web3':145 'wider':122 'x':110 'x-payment':109 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cea0a6d4-aa4c-4524-bd10-16549f527e02","listingId":"a7bf0a6f-05c3-4636-8837-212e4ecff2dd","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/keys/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.068Z"}],"sources":[{"listingId":"a7bf0a6f-05c3-4636-8837-212e4ecff2dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.068Z","lastSeenAt":"2026-04-22T01:02:19.554Z"}],"details":{"listingId":"a7bf0a6f-05c3-4636-8837-212e4ecff2dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/92 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/92"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/92"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native (USDC on Base) billing over traditional API keys"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.771Z"},"updatedAt":"2026-04-22T01:02:19.554Z"}}