{"id":"822d806a-368f-44aa-80a5-4d196864e80a","shortId":"8wHY9P","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 offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/transactions/42` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (0.02 USD) per call. Payment is settled on-chain to a designated wallet address, with no API keys, rate limits, or subscriptions required.\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 (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nDocumentation 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 usage examples available from the crawled content. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and returns application/json.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limit","json-response"],"categories":["api-gateway","finance","ai"],"synonyms":["x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","crypto api access","on-chain payment api"],"warnings":["No API documentation available — docs, pricing, and README pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/42 ('Premium API Access') is unclear — it may be a demo or placeholder endpoint","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/42","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/42","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/transactions/42 is 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'/request':13,28,142 '0.02':12,27,70,141 '000':65 '20':64 'accept':198 'access':7,22,41,59 'across':99 'address':84 'advertis':97 'ai':109 'analysi':113 'analyt':103 'api':6,21,40,58,87,151 'application/json':203 'avail':181 'base':9,24,49,66 'base usdc api' 'base-network' 'broader':95 'call':4,19,73 'categori':101 'chain':79 'challeng':188 'charg':61 'classif':116 'confirm':195 'connect':160 'content':185 'convers':132 'crawl':184 'crypto api access' 'data':102,106 'design':82 'detail':167 'doc':150 'document':145,176 'embed':117 'endpoint':53,98,135,197 'estim':127 'exampl':180 'exchang':122 'export':107 'extrem':147 'feed':121 'financ':118 'form':194 'four':100 'gas':126 'generat':133 'geocod':130 'infrastructur':129 'insight':108 'json-response' 'key':88 'label':56 'learn':111 'limit':90 'list':137 'live':190 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':110 'metric':104 'micropayment api' 'network':50 'no-api-key' 'no-rate-limit' 'offer':32 'on-chain':77 'on-chain payment api' 'openapi':171 'page':155 'pay':2,17,37 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':36 'payment':45,74 'per':3,18,38,72 'platform':96 'point':144 'post':199 'premium':5,20,57 'price':120,143,152 'prompt':162 'protocol':46 'quot':125 'rate':89,123 'readm':154 'render':157 'report':105 'request':39,200 'request/response':174 'requir':93 'return':202 'schema':175 'sentiment':112 'settl':76 'spars':148 'spec':172 'specif':52 'subscript':92 'suit':34 'summar':115 'technic':166 'text':114 'token':124 'unit':67 'usag':179 'usd':71 'usdc':15,30,69 'usdc-settlement' 'valid':131 'via':10,25,42 'wallet':83,161 'web3':119 'well':193 'well-form':192 'x402':11,26,44,187 'x402 api' 'x402-payment'","prices":[{"id":"1cb89519-0229-4e86-bca9-dd55b0af69c8","listingId":"822d806a-368f-44aa-80a5-4d196864e80a","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:39.868Z"}],"sources":[{"listingId":"822d806a-368f-44aa-80a5-4d196864e80a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:39.868Z","lastSeenAt":"2026-04-22T10:32:23.250Z"}],"details":{"listingId":"822d806a-368f-44aa-80a5-4d196864e80a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/42 \\\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":"Endpoint charges up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/42"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or transaction endpoints without managing API keys or subscriptions","Programmatic pay-per-use access to analytics, AI inference, or financial data","Agent-driven workflows that need on-demand API calls settled in USDC on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request crypto settlement overhead is impractical","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.298Z"},"updatedAt":"2026-04-22T10:32:23.250Z"}}