{"id":"688aade3-db91-43f1-89d8-871ba0143728","shortId":"NEYxcz","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/35` 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\nHowever, the specific functionality behind `/api/v1/policies/35` is not documented beyond the label \"Premium API Access.\" 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. The endpoint is live and responds with a valid x402 challenge, but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","The specific functionality of /api/v1/policies/35 ('Premium API Access') is undocumented","No OpenAPI schema or request/response examples provided","No way to verify what data or service is returned after payment without actually paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/35","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/35","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 documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific purpose of '/api/v1/policies/35' is entirely 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'/call':13,28 '0.02':12,27,78,146 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,163 'actual':207 'addit':188 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,162,177 'attach':91 'base':8,23,51,73 'base network api' 'behind':153 'beyond':158 'broader':100 'call':80 'caller':89 'categori':105 'challeng':67,200 'classif':121 'connect':183 'content':189 'convers':138 'data':107,111,203 'doc':174 'document':157 'embed':122 'endpoint':55,141,191 'estim':132 'exampl':171 'exchang':127 'export':112 'feed':126 'financ':123 'function':152 'gas':131 'generat':139 'geocod':136 'header':95 'howev':149 'http-post' 'i.e':77 'includ':106 'infrastructur':134 'insight':113 'json-response' 'key':83 'label':160 'learn':116 'limit':86 'list':58 'live':193 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment api' 'multipl':103 'network':9,24,52 'no-api-key' 'openapi':167 'page':178 'pay':2,17,35 'pay per call api' 'pay-per-request':1,16,34 'payment':48,94,211 'per':3,18,36,79,147 'platform':6,21,39,101 'premium':60,161 'price':125,144,175 'prompt':185 'protocol':44 'quot':130 'rate':85,128 'render':180 'report':110 'request':4,19,37,68,98,148 'request/response':170 'requir':88 'respond':195 'return':64,208 'schema':168 'sentiment':117 'servic':205 'simpli':90 'specif':54,151 'success':210 'summar':120 'text':119 'token':129 'uniform':143 'unit':74 'unknown':213 'upon':209 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':135 'valid':137,198 'via':10,25 'wallet':184 'web3':124 'x402':11,26,43,93,199 'x402 api' 'x402-payment'","prices":[{"id":"9f6a01c1-339d-4d2b-94af-95cb7016cac6","listingId":"688aade3-db91-43f1-89d8-871ba0143728","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:49.915Z"}],"sources":[{"listingId":"688aade3-db91-43f1-89d8-871ba0143728","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:49.915Z","lastSeenAt":"2026-04-24T01:32:25.728Z"}],"details":{"listingId":"688aade3-db91-43f1-89d8-871ba0143728","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/35 \\\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 Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/35"},{"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/policies/35"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting zero-commitment, per-call API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before purchasing","Anyone requiring free or subscription-based access without crypto payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.966Z"},"updatedAt":"2026-04-24T01:32:25.728Z"}}