{"id":"1929b824-bf49-40b0-8197-b4754a8417c0","shortId":"BBGwky","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","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/47` 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. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 listed endpoints share the same $0.02 per-request pricing.\n\nThe `/api/v1/policies/47` endpoint itself lacks detailed documentation — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns. The endpoint is confirmed live (402 challenge captured), but the exact functionality behind this specific policy endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","premium api access"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet' with no substantive content","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific functionality of /api/v1/policies/47 ('Premium API Access') is entirely undocumented","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/policies/47 actually returns. The docs pages render only 'Connect wallet' with no content. This is effectively a stub 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'/call':12,31 '0.02':11,30,86,158 '000':80 '20':79 '402':74,210 'accept':54 'access':70,100,202 'across':116 'actual':203 'advertis':91 'ai':15,34,126 'analysi':130 'analyt':120 'api':5,24,46,69,93,174,201 'attach':103 'base':8,27,59,81 'base network api' 'behind':217 'broader':112 'call':88 'caller':101 'captur':212 'categori':118 'challeng':75,211 'classif':133 'confirm':208 'connect':180 'content':186 'convers':150 'data':14,33,119,123 'descript':197 'detail':168 'doc':171 'document':169 'embed':134 'endpoint':19,38,63,115,154,165,206,221 'estim':144 'exact':215 'exampl':194 'exchang':139 'export':124 'feed':138 'financ':16,35,135 'four':117 'function':216 'gas':143 'generat':151 'geocod':148 'header':107 'i.e':85 'infrastructur':146 'insight':125 'instant':99 'json-response' 'key':94 'lack':167 'learn':128 'limit':97 'list':66,153 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment api' 'network':60 'no-api-key' 'offer':114 'openapi':190 'page':175 'pay':2,21,43 'pay per call api' 'pay-per-request':1,20,42 'payment':56,106 'per':3,22,44,87,160 'per-request':159 'platform':6,25,47,90,113 'polici':220 'post-method' 'premium':68,200 'premium api access' 'price':137,162,172 'prompt':182 'protocol':52 'quot':142 'rate':96,140 'render':177 'report':122 'request':4,23,45,76,110,161 'request/response':193 'return':72,204 'schema':191 'sentiment':129 'share':155 'simpli':102 'specif':62,219 'summar':132 'text':131 'token':141 'unclear':223 'unit':82 'usdc':55,84 'usdc api access' 'usdc-base-network' 'use':49 'util':18,37,147 'valid':149 'via':9,28 'wallet':181 'web3':136 'x402':10,29,51,105 'x402 api' 'x402-payment'","prices":[{"id":"1fbf28c6-5ea4-464c-a1e3-8e9b6aad684b","listingId":"1929b824-bf49-40b0-8197-b4754a8417c0","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:00.207Z"}],"sources":[{"listingId":"1929b824-bf49-40b0-8197-b4754a8417c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:00.207Z","lastSeenAt":"2026-04-24T00:32:16.703Z"}],"details":{"listingId":"1929b824-bf49-40b0-8197-b4754a8417c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/47 \\\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/47"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/47"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into autonomous agent workflows"],"bestFor":["Developers wanting frictionless pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.477Z"},"updatedAt":"2026-04-24T00:32:16.703Z"}}