{"id":"6af626fe-62c0-43da-8444-a7d97212794a","shortId":"jjeVPr","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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/wire/181` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are advertised.\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 listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/wire/181` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an opaque paid endpoint until further documentation is available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/wire/181 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema, no request body schema, and no response examples are available.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none are documented beyond titles and prices."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/181","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/wire/181","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schema, and the docs pages are empty. The listing is effectively a 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'/request':12,28,153 '0.02':11,27,69,84,152 '000':75 '20':74 '6':82 'Base network API' 'USDC micropayment API' 'accept':48 'access':64,164 'account':98 'actual':202 'addit':195 'advertis':103,107 'ai':119 'analysi':123 'analyt':113 'api':5,14,21,30,40,63,96,109,163,184 'avail':217 'base':8,24,53,76 'behind':160 'beyond':168 'broader':105 'call':4,20,71 'caller':204 'categori':110 'classif':126 'connect':190 'content':196 'convers':143 'cost':66 'crypto-paid API' 'data':112,116 'decim':83 'doc':181 'document':167,215 'embed':127 'endpoint':57,146,201,212 'estim':137 'exampl':178 'exchang':132 'export':117 'feed':131 'financ':128 'function':159 'gas':136 'generat':144 'geocod':141 'header':94 'howev':156 'http-post' 'includ':111 'infrastructur':139 'inlin':88 'insight':118 'key':15,31,97 'know':198 'learn':121 'limit':101 'list':60,148 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':120 'made':87 'maxamountrequir':72 'metric':114 'multipl':108 'network':54 'no-api-key' 'opaqu':210 'openapi':174 'page':185 'paid':211 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,85,93 'per':3,19,38,70 'platform':6,22,41,106 'point':155 'premium':62,162 'premium API access' 'price':130,154,182 'prompt':192 'protocol':46 'quot':135 'rate':100,133 'render':187 'report':115 'request':39 'request/response':177 'requir':16,32 'return':203 'schema':175 'sentiment':122 'specif':56,158 'summar':125 'text':124 'titl':170 'token':134 'treat':206 'unit':77 'usdc':49,79 'usdc-base' 'use':43 'util':140 'valid':142 'via':9,25,89 'wallet':191 'web3':129 'without':197 'x':92 'x-payment':91 'x402':10,26,45 'x402 API' 'x402-payment'","prices":[{"id":"3d5d3a2b-17f2-46b6-9b83-e3bdce646328","listingId":"6af626fe-62c0-43da-8444-a7d97212794a","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/wire/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:02.261Z"}],"sources":[{"listingId":"6af626fe-62c0-43da-8444-a7d97212794a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:02.261Z","lastSeenAt":"2026-04-22T18:32:46.555Z"}],"details":{"listingId":"6af626fe-62c0-43da-8444-a7d97212794a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/181 \\\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/wire/181"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/181"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing an API key or account","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access","x402 protocol integrators looking for a live test endpoint","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone without a Base-network USDC wallet or x402-compatible client","Use cases requiring known, well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.472Z"},"updatedAt":"2026-04-22T18:32:46.555Z"}}