{"id":"c36d6a1f-a4a9-4615-a6fa-8a893d1e522c","shortId":"LyUh7E","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/322` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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. The x402 challenge confirms the endpoint is live, uses the \"exact\" payment scheme on Base, accepts USDC (contract 0x8335…2913), and responds with application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the `/api/v1/transactions/322` path is unclear; the generic \"Premium API Access\" label does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API","serverless API billing"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, and /README pages return only a wallet-connect prompt","The exact functionality of /api/v1/transactions/322 ('Premium API Access') is not described anywhere in the crawled material","No example request or response payloads are available; integration requires trial-and-error","The broad catalog of endpoints (AI, finance, data, utils) is listed on the homepage but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/322","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/transactions/322","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI spec, no request/response schema, and no documentation beyond a landing page listing. The specific purpose of /api/v1/transactions/322 is undocumented, making this effectively a stub 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'/api/v1/transactions/322':69,242 '/docs':205 '/pricing':207 '/readme':209 '/request':19,38,170 '0.02':18,37,80,169 '000':86 '0x8335':190 '20':85 '2913':191 '6':92 'Base network API' 'USDC API' 'accept':187 'access':75,250 'account':104 'advertis':126 'ai':12,31,137 'ai-inference' 'analysi':141 'analyt':131 'api':5,24,45,74,102,249 'application/json':195 'attach':112 'avail':236 'base':8,27,63,87,186 'base-network' 'behind':240 'beyond':197 'broad':50 'call':4,23,82 'caller':110 'catalog':51 'categori':129 'challeng':174 'classif':144 'confirm':175 'connect':215 'contract':189 'convers':161 'cost':77 'cover':10,29 'crypto-paid API' 'data':11,30,130,134,256 'data-analytics' 'decim':93 'describ':254 'detail':222 'document':196,231 'embed':145 'enabl':44 'endpoint':16,35,57,67,128,165,177 'estim':155 'exact':182,238 'exampl':234 'exchang':150 'export':135 'extrem':202 'feed':149 'financ':13,32,146 'finance-data' 'four':127 'function':239 'gas':154 'generat':162 'generic':247 'geocod':159 'handl':96 'header':117 'infrastructur':157 'insight':136 'json-response' 'key':103 'label':251 'land':199 'learn':139 'limit':107 'list':71,164 'live':179 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'maxamountrequir':83 'metric':132 'micropayment API' 'network':64 'no-api-key' 'offer':48 'openapi':226 'page':200,210 'path':243 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payload':235 'payment':94,116,121,183 'per':3,22,55,81 'platform':6,25,46,125 'premium':73,248 'price':148,171 'prompt':217 'proof':122 'protocol':100 'quot':153 'rate':106,151 'render':212 'report':133 'request':56 'request/response':229 'requir':109 'respond':193 'return':260 'schema':230 'scheme':184 'sentiment':140 'serverless API billing' 'servic':258 'settl':58 'share':166 'simpli':111 'spars':203 'spec':227 'specif':66 'summar':143 'technic':221 'text':142 'token':152 'unclear':245 'unit':88 'usdc':9,28,60,90,188 'usdc-settlement' 'use':180 'util':15,34,158 'utility-services' 'valid':120,160 'via':97 'wallet':216 'web3':147 'wider':124 'x':115 'x-payment':114 'x402':43,99,173 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"23b096b2-96dc-4dbd-ab52-c9acc8e6abf0","listingId":"c36d6a1f-a4a9-4615-a6fa-8a893d1e522c","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/transactions/322","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:04.131Z"}],"sources":[{"listingId":"c36d6a1f-a4a9-4615-a6fa-8a893d1e522c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/322","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:04.131Z","lastSeenAt":"2026-04-22T19:32:18.319Z"}],"details":{"listingId":"c36d6a1f-a4a9-4615-a6fa-8a893d1e522c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/322 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/transactions/322"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/transactions/322"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/322"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics or AI inference endpoints without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-request finance or utility services into agent workflows"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-call pricing without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.969Z"},"updatedAt":"2026-04-22T19:32:18.319Z"}}