{"id":"efcc00f6-2a96-4506-a4c6-6a321145cb6c","shortId":"JRBQ3g","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/policies/11` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform 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) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units corresponds to $0.02 (USDC uses 6 decimals). The endpoint returns application/json responses with a maximum payment timeout of 300 seconds.\n\nWhile the platform advertises a broad suite of APIs (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), the specific functionality behind `/api/v1/policies/11` is not documented beyond the label \"Premium API Access.\" No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/policies/11 is not documented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body format, or response examples were found.","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none are documented in detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/policies/11 is undocumented beyond the generic label 'Premium API Access.' The docs and other pages returned only wallet-connect prompts with no 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'/call':13,28 '0.02':12,27,79,131 '0x1a2b':121 '0x8335':115 '20000':126 '2913':116 '300':147 '6':134 '85f3':122 'Base network API' 'USDC API access' 'accept':106 'access':7,22,38,188 'address':120 'advertis':152 'ai':63 'analysi':161 'analyt':62 'api':6,21,37,91,157,187,204 'application/json':139 'base':9,24,87,118,127 'behind':178 'beyond':183 'broad':154 'categori':59 'challeng':100 'classif':164 'commit':96 'confirm':101 'connect':213 'content':219 'contract':114 'convers':172 'correspond':129 'crawl':201 'data':61 'decim':135 'detail':195 'doc':203 'document':182,196 'embed':165 'endpoint':32,52,72,103,137 'exampl':193 'exchang':168 'feed':167 'financ':66 'found':198 'function':177 'generat':174 'geocod':170 'includ':60 'infrastructur':69 'json-response' 'key':92 'label':185 'learn':65 'limit':94 'live':105 'low payment fee API' 'lowpaymentfee.com':34 'machin':64 'mani':51 'maxamountrequir':124 'maximum':143 'metric':158 'micropayment API' 'network':88 'no-api-key' 'offer':53 'one':49 'openapi':190 'page':208 'paid':82 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':42,111,144 'per':3,18,80 'platform':56,75,151 'post':107 'post-method' 'premium':5,20,36,186 'price':77,166,205 'prompt':215 'protocol':43 'provid':35 'rate':93,169 'readm':207 'report':159 'request':4,19,81,108 'request/response':192 'requir':97 'resourc':46 'respons':140 'return':138,210 'schema':191 'second':148 'sentiment':160 'settl':110 'span':58 'specif':45,176 'substant':218 'suit':155 'summar':163 'text':162 'timeout':145 'unit':128 'usdc':15,30,84,113,132 'usdc-base' 'use':133 'util':70 'valid':171 'via':10,25,39 'wallet':214 'web3':67 'x402':11,26,41,99 'x402 premium API' 'x402-payment'","prices":[{"id":"dbcb4740-9b33-417a-b01f-f73b4a3d1847","listingId":"efcc00f6-2a96-4506-a4c6-6a321145cb6c","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:51.725Z"}],"sources":[{"listingId":"efcc00f6-2a96-4506-a4c6-6a321145cb6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:51.725Z","lastSeenAt":"2026-04-23T08:01:37.254Z"}],"details":{"listingId":"efcc00f6-2a96-4506-a4c6-6a321145cb6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/11 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/11"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/11"}],"useCases":["Accessing premium API resources with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","Agents needing keyless API access with crypto micropayments","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.946Z"},"updatedAt":"2026-04-23T08:01:37.254Z"}}