{"id":"4ff90972-ce7f-4809-a929-362af873d60b","shortId":"qrftNd","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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/policies/53` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions 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.\n\nHowever, the specific functionality of the `/api/v1/policies/53` 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 on the site all render only a \"Connect wallet\" prompt with no additional technical documentation. Without an OpenAPI schema, request/response examples, or meaningful docs, the actual behavior of this endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific purpose and response format of /api/v1/policies/53 is undocumented","No OpenAPI schema or request/response examples provided","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/53","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/policies/53","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), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic title. The docs pages render only 'Connect wallet' with no technical content. The actual functionality of /api/v1/policies/53 is 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'/call':13,28 '0.02':12,27,67,144 '000':71 '20':70 '6':77 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,163 'actual':206 'addit':193 'advertis':101 'ai':113 'analysi':117 'analyt':107 'api':5,20,38,61,80,103,162,179 'attach':90 'base':8,23,51,72 'behavior':207 'broader':99 'caller':88 'categori':104 'classif':120 'connect':188 'convers':137 'cost':64 'crypto-paid API' 'data':106,110,170 'decim':78 'descript':158 'doc':176,204 'document':167,195 'embed':121 'endpoint':55,140,154,210 'estim':131 'exampl':201 'exchang':126 'export':111 'feed':125 'financ':122 'function':150 'gas':130 'generat':138 'geocod':135 'header':94 'howev':147 'http-post' 'includ':105 'infrastructur':133 'insight':112 'json-response' 'key':81 'learn':115 'limit':83 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':114 'meaning':203 'metric':108 'micropayment API' 'multipl':102 'network':9,24,52 'no-api-key' 'opaqu':212 'openapi':198 'page':180 'pay':2,17,35 'pay-per-request':1,16,34 'payment':48,93 'per':3,18,36,68,145 'platform':6,21,39,100 'premium':60,161 'price':124,142,177 'prompt':190 'protocol':44 'quot':129 'rate':82,127 'remain':211 'render':185 'report':109 'request':4,19,37,69,97,146 'request/response':200 'requir':87 'return':174 'say':160 'schema':199 'sentiment':116 'servic':172 'simpli':89,159 'site':183 'specif':54,149 'subscript':85 'summar':119 'technic':194 'text':118 'token':128 'unclear':156 'unit':73 'usdc':15,30,47,75 'usdc-base-network' 'use':41 'util':134 'valid':136 'via':10,25 'wallet':189 'web3':123 'without':196 'x402':11,26,43,92 'x402 API' 'x402-payment'","prices":[{"id":"1e1fac3c-95fe-4585-b73b-84577e65e736","listingId":"4ff90972-ce7f-4809-a929-362af873d60b","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/policies/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:11.056Z"}],"sources":[{"listingId":"4ff90972-ce7f-4809-a929-362af873d60b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:11.056Z","lastSeenAt":"2026-04-24T00:32:17.148Z"}],"details":{"listingId":"4ff90972-ce7f-4809-a929-362af873d60b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/53 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/policies/53"},{"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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/53"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Projects wanting low-friction micropayment API integration"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.972Z"},"updatedAt":"2026-04-24T00:32:17.148Z"}}