{"id":"3aa58067-e458-430f-8ee8-71846cf7e245","shortId":"eSYzzT","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/policies/36` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x8335...2913` on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made via the `exact` scheme with a 300-second timeout. The response MIME type is `application/json`.\n\nThe specific functionality behind `/api/v1/policies/36` is not documented — the platform's landing page lists other endpoints (analytics, AI, finance, utilities) but does not describe what the \"policies\" path does. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation. Agents should be aware that the actual payload schema (both request and response) is undocumented, making integration speculative without further experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","premium api"],"warnings":["The specific purpose and functionality of /api/v1/policies/36 is undocumented — the 'policies' path is not listed among the platform's advertised endpoints.","No request or response schema is available; integration requires trial-and-error.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The platform lists many endpoint categories but provides no detailed documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/36","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/36","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 challenge with clear pricing ($0.02 USDC on Base). However, the specific functionality of /api/v1/policies/36 is completely undocumented — no request schema, no response schema, no description beyond 'Premium API Access'. The docs/pricing/API pages are empty (wallet-connect only). This is effectively a stub 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'/request':13,28 '0.02':12,27,76,131 '000':122 '0x8335':112 '20':121 '2913':113 '300':141 '6':127 'accept':103 'access':7,22,38 'actual':202 'addit':194 'agent':196 'ai':62,167 'amount':118 'analyt':61,166 'api':6,21,37,88,183 'application/json':149 'awar':199 'base':9,24,84,115,123 'base network api' 'behind':153 'call':4,19 'categori':70 'challeng':97 'commit':93 'confirm':98 'connect':189 'contract':111 'data':60 'decim':128 'describ':173 'doc':180 'document':157,195 'endpoint':32,53,72,100,165 'equal':130 'exact':137 'experiment':216 'financ':65,168 'function':152 'infrastructur':68 'integr':212 'json-api' 'key':89 'land':161 'learn':64 'limit':91 'list':163 'live':102 'low payment fee' 'lowpaymentfee.com':34 'machin':63 'made':134 'make':211 'mani':52 'max':117 'micropayment api' 'mime':146 'network':85 'no-api-key' 'no-rate-limit' 'offer':54 'one':50 'page':162,184 'paid':79 'path':177 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payload':203 'payment':42,108,132 'per':3,18,77 'platform':57,159 'polici':176 'post':104 'premium':5,20,36 'premium api' 'price':74,181 'prompt':191 'protocol':43 'provid':35 'rate':90 'render':186 'request':78,105,206 'requir':94,119 'resourc':46 'respons':145,208 'schema':204 'scheme':138 'second':142 'settl':107 'span':59 'specif':45,151 'specul':213 'timeout':143 'type':147 'undocu':210 'unit':124 'usdc':15,30,81,110,126 'usdc api access' 'usdc-base' 'util':69,169 'via':10,25,39,135 'wallet':190 'web3':66 'without':214 'x402':11,26,41,96 'x402 api' 'x402-payment'","prices":[{"id":"237403f5-ff9f-4e78-9734-f54608db151b","listingId":"3aa58067-e458-430f-8ee8-71846cf7e245","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:59.610Z"}],"sources":[{"listingId":"3aa58067-e458-430f-8ee8-71846cf7e245","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:59.610Z","lastSeenAt":"2026-04-22T08:31:25.833Z"}],"details":{"listingId":"3aa58067-e458-430f-8ee8-71846cf7e245","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/36 \\\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":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/policies/36"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/36"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","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","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents needing keyless, on-demand API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.573Z"},"updatedAt":"2026-04-22T08:31:25.833Z"}}