{"id":"0e666b22-a329-4da2-ac7e-4133269894a1","shortId":"QRjTKW","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/248` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 priced at $0.02 per request and settle via USDC on Base.\n\nHowever, the specific functionality of the `/api/v1/transactions/248` endpoint is unclear. The description simply says \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without schema details, example responses, or documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/transactions/248 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","No OpenAPI schema, example requests, or example responses are available.","The endpoint path suggests a transaction-specific resource (ID 248) but its purpose is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/248","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/248","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality of this specific endpoint (/api/v1/transactions/248) is completely undocumented. The docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,65,142 '000':69 '20':68 '402 payment endpoint' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,167 'account':80 'actual':204 'addit':194 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,166,183 'attach':88 'base':8,23,51,70,150 'behavior':205 'broader':97 'call':4,19,67 'caller':86 'categori':102 'classif':118 'connect':189 'content':195 'convers':135 'cost':64 'crypto-paid API' 'data':104,108,174 'decim':76 'descript':162 'detail':198 'doc':180 'document':171,202 'embed':119 'endpoint':55,138,158,208 'estim':129 'exampl':199 'exchang':124 'export':109 'feed':123 'financ':120 'function':154 'gas':128 'generat':136 'geocod':133 'header':92 'howev':151 'http-post' 'includ':103 'infrastructur':131 'insight':110 'key':79 'learn':113 'limit':83 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'multipl':100 'network':9,24,52 'no-api-key' 'page':184 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,91 'per':3,18,36,66,143 'platform':6,21,39,98 'premium':60,165 'price':122,140,181 'prompt':191 'protocol':44 'quot':127 'rate':82,125 'remain':209 'render':186 'report':107 'request':37,95,144 'requir':85 'respons':200 'return':178 'say':164 'schema':197 'sentiment':114 'servic':176 'settl':146 'simpli':87,163 'specif':54,153 'summar':117 'text':116 'token':126 'unclear':160 'unit':71 'unknown':210 'usdc':15,30,47,73,148 'usdc-base' 'use':41 'util':132 'valid':134 'via':10,25,147 'wallet':190 'web3':121 'without':196 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"caf3376e-067c-4425-b1a0-e5446de3720a","listingId":"0e666b22-a329-4da2-ac7e-4133269894a1","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/248","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:33.623Z"}],"sources":[{"listingId":"0e666b22-a329-4da2-ac7e-4133269894a1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/248","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:33.623Z","lastSeenAt":"2026-04-24T16:03:18.526Z"}],"details":{"listingId":"0e666b22-a329-4da2-ac7e-4133269894a1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/248 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/248"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/248"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls settled instantly in USDC on Base","Agent-driven workflows that need frictionless per-request billing"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with USDC wallets on Base that need programmatic endpoint access","Prototyping workflows where traditional API key management is undesirable"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 would be cost-prohibitive compared to subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.82Z"},"updatedAt":"2026-04-24T16:03:18.526Z"}}