{"id":"a4290c11-637f-4cae-9655-c61d4e775a69","shortId":"Ncyazh","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/238` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys 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 uniformly priced at $0.02 per request.\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 schema, no request/response examples, and no description of what the `/api/v1/transactions/238` 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 resource provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","low fee API","crypto API payments"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The purpose of /api/v1/transactions/238 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/238","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/238","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and no description of what this specific endpoint actually returns. The listing is effectively a 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'/request':13,28 '0.02':12,27,78,146 '000':72 '20':71 '402':66 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62 'actual':188 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,155 'attach':91 'base':8,23,51,73 'broader':100 'call':4,19,80 'caller':89 'categori':105 'challeng':67,200 'classif':121 'connect':164 'convers':138 'crypto API payments' 'data':107,111,208 'descript':182 'detail':171 'doc':154 'document':149,203 'embed':122 'endpoint':55,141,187,191 'estim':132 'exampl':179 'exchang':127 'export':112 'extrem':151 'feed':126 'financ':123 'function':210 'gas':131 'generat':139 'geocod':136 'header':95 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'json-response' 'key':83 'learn':116 'limit':86 'list':58 'live':193 'low fee API' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment API' 'multipl':103 'network':9,24,52 'no-api-key' 'openapi':175 'page':159 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,94 'per':3,18,36,79,147 'platform':6,21,39,101 'premium':60 'price':125,144,156 'prompt':166 'protocol':44 'provid':214 'quot':130 'rate':85,128 'readm':158 'render':161 'report':110 'request':37,68,98,148 'request/response':178 'requir':88 'resourc':213 'respond':195 'return':64,189 'schema':176 'sentiment':117 'simpli':90 'spars':152 'specif':54,212 'summar':120 'technic':170 'text':119 'token':129 'unclear':206 'uniform':143 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':135 'valid':137,198 'via':10,25 'wallet':165 'web3':124 'without':202 'x402':11,26,43,93,199 'x402 API' 'x402-payment'","prices":[{"id":"d82dfe7b-6ff0-4fca-bb36-d3aac4d8ab5c","listingId":"a4290c11-637f-4cae-9655-c61d4e775a69","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/238","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:24.050Z"}],"sources":[{"listingId":"a4290c11-637f-4cae-9655-c61d4e775a69","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/238","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:24.050Z","lastSeenAt":"2026-04-23T17:32:16.291Z"}],"details":{"listingId":"a4290c11-637f-4cae-9655-c61d4e775a69","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/238 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/238"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/238"},{"claim":"API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or transaction information via a single USDC micropayment","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in USDC on Base"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring free or subscription-based access models","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.367Z"},"updatedAt":"2026-04-23T17:32:16.291Z"}}