{"id":"304602ce-a2a7-477a-9fdd-e53c07ba7bd5","shortId":"prxCvv","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a suite of x402-protocol pay-per-call APIs hosted on the Base network. The specific resource `/api/v1/policies/49` is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, the specific `/api/v1/policies/49` endpoint does not clearly map to any of these advertised categories, and no documentation describes what data or functionality it returns.\n\nThe endpoint is confirmed live — it returns a proper HTTP 402 x402 challenge. However, documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" stub with no meaningful content. There is no OpenAPI schema, no request/response examples, and no description of what the \"policies/49\" resource actually provides. Agents should be aware that the actual payload and behavior of this endpoint are unknown beyond the x402 payment metadata.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content.","The purpose and response format of /api/v1/policies/49 are completely unknown.","No OpenAPI or output schema provided beyond basic HTTP method metadata.","This endpoint does not map to any of the advertised API categories on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/49","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/49","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 x402 402 challenge, and pricing is clear ($0.02 USDC per request). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/policies/49' is entirely undocumented. All doc pages returned empty 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'/api/v1/policies/49':55,163 '/docs':201 '/pricing':203 '/readme':204 '0.02':10,24,92,146 '000':87 '0x8335':77 '20':86 '2913':78 '402':195 '6':97 'Base network API' 'USDC micropayment API' 'accept':62 'access':6,20,60 'across':105 'actual':232,240 'advertis':103,173 'agent':234 'ai':115 'amount':84 'analysi':119 'analyt':109 'api':5,19,46,59,151 'awar':237 'base':8,22,50,80,88 'base-network' 'behavior':243 'beyond':249 'broader':100 'call':45 'categori':107,174 'challeng':70,197 'classif':122 'clear':167 'commit':159 'confirm':188 'connect':209 'content':215 'contract':76 'convers':139 'crypto-gated endpoint' 'data':108,112,180 'decim':98 'describ':178 'descript':226 'document':177,199 'embed':123 'endpoint':30,104,142,164,186,246 'equal':91 'estim':133 'exampl':223 'exchang':128 'export':113 'feed':127 'financ':124 'four':106 'function':182 'gas':132 'gate':3,17,65 'generat':140 'geocod':137 'host':47 'howev':160,198 'http':194 'http-post' 'infrastructur':135 'insight':114 'key':152 'label':57 'learn':117 'limit':155 'live':189 'lowpaymentfee' 'lowpaymentfee.com':32,101 'machin':116 'map':168 'maximum':83 'meaning':214 'metadata':253 'metric':110 'minimum':158 'network':51 'openapi':219 'page':200 'part':34 'pay':9,23,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payload':241 'payment':69,71,252 'per':11,25,44,93,147 'platform':102 'policies/49':230 'post':63 'premium':4,18,58 'premium API access' 'price':126,144 'proper':193 'protocol':41 'provid':233 'quot':131 'rate':129,154 'report':111 'request':12,26,64,94,148 'request/response':222 'resourc':54,231 'return':184,191,206 'schema':220 'sentiment':118 'settl':73 'specif':53,162 'stub':211 'suit':37 'summar':121 'text':120 'token':130 'unit':89 'unknown':248 'usdc':14,28,75,95 'usdc-settlement' 'use':96 'util':136 'valid':138 'wallet':210 'web3':125 'x402':2,16,40,68,196,251 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':39","prices":[{"id":"da186154-185a-46a9-84d4-8f81711253f0","listingId":"304602ce-a2a7-477a-9fdd-e53c07ba7bd5","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:53.502Z"}],"sources":[{"listingId":"304602ce-a2a7-477a-9fdd-e53c07ba7bd5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:53.502Z","lastSeenAt":"2026-04-23T08:01:37.320Z"}],"details":{"listingId":"304602ce-a2a7-477a-9fdd-e53c07ba7bd5","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# Using curl as an example (you need an x402-compatible client to sign payment):\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/49 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/49"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/49"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without API keys or subscriptions","Integrating x402-compatible agents with low-cost endpoints on Base","Accessing premium content or data behind a USDC micropayment wall"],"bestFor":["Agents that support x402 payment protocol on Base","Developers wanting keyless, pay-as-you-go API access","Low-cost per-call usage without rate limits or commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring free or subscription-based access models","Use cases needing guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.828Z"},"updatedAt":"2026-04-23T08:01:37.320Z"}}