{"id":"cf23ef9c-cfbb-4a0a-9d90-985c3e91ce2f","shortId":"RtPveV","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. Each call costs $0.02 in USDC (USD Coin) with no API keys, no rate limits, and no upfront commitments required. The specific endpoint at `/api/resource/44` is described as \"Premium API Access\" and returns `application/json` responses to POST requests.\n\nThe broader platform advertises endpoints across four 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 endpoints are listed at $0.02 per request. Payment settles on the Base L2 network using USDC (contract `0x8335…2913`) via the x402 \"exact\" scheme.\n\nNote that `/api/resource/44` does not correspond to any of the named endpoints on the landing page — it may be a generic or unlisted resource. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no detailed schema, parameter documentation, or example responses available for this or any other endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-l2","json-api","post-method"],"categories":["general","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The path /api/resource/44 does not match any of the named endpoints on the landing page; its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content — only a 'Connect wallet' prompt.","No OpenAPI spec, request schema, or response examples are available.","The platform appears to be a generic x402 demo or marketplace; the quality and reliability of the underlying services is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/resource/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/resource/44","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). However, /api/resource/44 is not listed among the named endpoints on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no content. The actual functionality behind this resource is 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'/api/resource/44':76,158 '/docs':182 '/pricing':183 '/readme':185 '/request':13,28 '0.02':12,27,55,136 '0x8335':149 '2913':150 'Base network API' 'USDC micropayment API' 'access':7,22,42,82 'across':95 'advertis':93 'ai':105 'analysi':109 'analyt':99 'api':6,21,40,62,81 'application/json':85 'avail':208 'base':9,24,50,143 'base-l2' 'broader':91 'call':4,19,53 'categori':97 'classif':112 'coin':59 'collect':34 'commit':70 'connect':190 'content':196 'contract':148 'convers':129 'correspond':161 'cost':54 'crypto-paid API' 'data':98,102 'describ':78 'detail':201 'document':180,204 'embed':113 'endpoint':41,74,94,132,167,214 'estim':123 'exact':154 'exampl':206 'exchang':118 'export':103 'feed':117 'financ':114 'four':96 'gas':122 'generat':130 'generic':176 'geocod':127 'host':32 'infrastructur':125 'insight':104 'json-api' 'key':63 'l2':144 'land':170 'learn':107 'limit':66 'list':134 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':106 'may':173 'metric':100 'name':166 'network':51,145 'note':156 'page':171,181 'paramet':203 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,139 'per':3,18,38,137 'platform':92 'post':88 'post-method' 'premium':5,20,80 'price':116 'prompt':192 'protocol':47 'quot':121 'rate':65,119 'report':101 'request':39,89,138 'requir':71 'resourc':179 'respons':86,207 'return':84,187 'schema':202 'scheme':155 'sentiment':108 'settl':140 'specif':73 'substant':195 'summar':111 'text':110 'token':120 'unlist':178 'upfront':69 'usd':58 'usdc':15,30,57,147 'usdc-settlement' 'use':146 'util':126 'valid':128 'via':10,25,43,151 'wallet':191 'web3':115 'x402':11,26,45,153 'x402 API' 'x402-payment'","prices":[{"id":"e42970ee-8464-42a7-b0b5-8ef9dda0ccc6","listingId":"cf23ef9c-cfbb-4a0a-9d90-985c3e91ce2f","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/resource/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":"2026-04-18T18:36:48.722Z"}],"sources":[{"listingId":"cf23ef9c-cfbb-4a0a-9d90-985c3e91ce2f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:48.722Z","lastSeenAt":"2026-04-22T13:30:32.074Z"}],"details":{"listingId":"cf23ef9c-cfbb-4a0a-9d90-985c3e91ce2f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/44 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base (i.e., $0.02).","source_url":"https://lowpaymentfee.com/api/resource/44"},{"claim":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/resource/44"}],"useCases":["Accessing premium API resources without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.654Z"},"updatedAt":"2026-04-22T13:30:32.074Z"}}