{"id":"1e15bff0-c3d1-436d-8af4-4c83b6b29130","shortId":"4tnDnv","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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or subscriptions required. The specific endpoint at `/api/v1/transactions/178` is listed as \"Premium API Access\" and returns JSON.\n\nThe platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). Each endpoint uses the x402 payment protocol, where callers attach a payment header with USDC on Base to authenticate and pay in a single step.\n\nThe probed endpoint (`/api/v1/transactions/178`) returned a valid 402 challenge with a `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. The endpoint accepts POST requests and returns `application/json`. Documentation beyond the landing page is essentially empty — the docs, API, pricing, and README pages all just show a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["The specific endpoint /api/v1/transactions/178 is not listed among the site's advertised APIs; its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) are empty — they only show 'Connect wallet' with no content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The endpoint's description 'Premium API Access' is generic and does not describe what the endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/178","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/178","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 OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The specific purpose of '/api/v1/transactions/178' labeled 'Premium API Access' is unclear — it does not appear in the site's listed API catalog, making its actual functionality 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'/request':13,28 '0.02':12,27,59,181 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':174 '20000':169 '402':163 '402 payment protocol' '6':177 'Base network API' 'USDC micropayment API' 'accept':184 'access':88 'across':45 'advertis':94 'ai':106 'ai/ml':48 'analysi':110 'analyt':47,100 'api':5,20,37,71,87,98,200 'application/json':189 'attach':140 'authent':149 'base':8,23,67,147,170,176 'beyond':191 'call':4,19 'caller':139 'categori':96 'challeng':164 'classif':113 'connect':209 'content':215 'convers':129 'crypto API access' 'data':46,99,103 'decim':178 'doc':199 'document':190 'embed':114 'empti':197 'enabl':36 'endpoint':44,55,80,132,158,183 'equal':180 'essenti':196 'estim':124 'exchang':119 'export':104 'feed':118 'financ':115 'finance/web3':50 'four':95 'gas':123 'generat':130 'geocod':127 'header':143 'infer':49 'infrastructur':52,126 'insight':105 'json':91 'json-response' 'key':72 'land':193 'learn':108 'limit':74 'list':84 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':107 'maxamountrequir':167 'metric':101 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'page':194,204 'paid':62 'pay':2,17,151 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':136,142 'per':3,18,60 'platform':6,21,38,93 'post':185 'post-method' 'premium':86 'price':57,117,201 'probe':157 'prompt':211 'protocol':137 'quot':122 'rate':73,120 'readm':203 'report':102 'request':61,186 'requir':77 'return':90,160,188 'sentiment':109 'show':207 'singl':154 'specif':79 'step':155 'subscript':76 'summar':112 'text':111 'token':121 'unit':171 'usdc':15,30,64,145,173 'usdc-base' 'use':133 'util':53 'valid':128,162 'varieti':42 'via':10,25 'wallet':210 'web3':116 'x402':11,26,35,135 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"612c0146-fa28-4bd0-874f-2232114e6b31","listingId":"1e15bff0-c3d1-436d-8af4-4c83b6b29130","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:52.162Z"}],"sources":[{"listingId":"1e15bff0-c3d1-436d-8af4-4c83b6b29130","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:52.162Z","lastSeenAt":"2026-04-22T21:31:36.914Z"}],"details":{"listingId":"1e15bff0-c3d1-436d-8af4-4c83b6b29130","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/178 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired of 20000 base units USDC (= $0.02) confirmed via 402 challenge","source_url":"https://lowpaymentfee.com/api/v1/transactions/178"}],"useCases":["Accessing analytics metrics and reports on a per-call basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with micropayments","Fetching real-time crypto prices, exchange rates, and gas estimates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments in USDC on Base","Low-volume or sporadic API usage where per-call pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.842Z"},"updatedAt":"2026-04-22T21:31:36.914Z"}}