{"id":"6e03ee14-4add-4227-b9ed-1d055c5b9d2d","shortId":"Rvk4yM","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/136` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.\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.\n\nHowever, documentation 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 examples of what the `/api/v1/transactions/136` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this specific transaction endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","on-chain payment API"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","Purpose of /api/v1/transactions/136 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this endpoint provides without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/136","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and no explanation of what the /api/v1/transactions/136 endpoint actually returns. The docs pages are all empty \"Connect wallet\" stubs. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,146 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62 'actual':190 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,84,105,156 'base':8,23,51,75 'broader':101 'call':4,19,82 'categori':106 'chain':99 'challeng':67,202 'classif':122 'connect':165 'convers':139 'crypto-paid API' 'data':108,112,210 'detail':172 'doc':155 'document':150,181,205 'embed':123 'endpoint':55,142,189,193,216 'estim':133 'exampl':184 'exchang':128 'export':113 'extrem':152 'feed':127 'financ':124 'function':212 'gas':132 'generat':140 'geocod':137 'howev':149 'i.e':79 'includ':107 'individu':95 'infrastructur':135 'insight':114 'json-response' 'key':85 'learn':117 'limit':87 'list':58 'live':195 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'metric':110 'multipl':104 'network':9,24,52 'no-api-key' 'on-chain':97 'on-chain payment API' 'openapi':176 'page':160 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69 'per':3,18,36,81,147 'platform':6,21,39,102 'premium':60 'price':126,144,157 'prompt':167 'protocol':44 'provid':217 'quot':131 'rate':86,129 'readm':159 'render':162 'report':111 'request':37,93,148 'request/response':179 'requir':68,91 'respond':197 'return':64,191 'schema':180 'sentiment':118 'settl':96 'spars':153 'spec':177 'specif':54,214 'subscript':89 'summar':121 'technic':171 'text':120 'token':130 'transact':215 'unclear':208 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':136 'valid':138,200 'via':10,25 'wallet':166 'web3':125 'without':204 'x402':11,26,43,201 'x402 API' 'x402-payment'","prices":[{"id":"6916ea7c-48f1-4c5b-a0ee-67d9c3114be2","listingId":"6e03ee14-4add-4227-b9ed-1d055c5b9d2d","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:30.958Z"}],"sources":[{"listingId":"6e03ee14-4add-4227-b9ed-1d055c5b9d2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:30.958Z","lastSeenAt":"2026-04-25T00:05:09.606Z"}],"details":{"listingId":"6e03ee14-4add-4227-b9ed-1d055c5b9d2d","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without a payment library, you'll get a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/136\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach payment.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/136"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need frictionless per-call payment"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.844Z"},"updatedAt":"2026-04-25T00:05:09.606Z"}}