{"id":"d02caab9-86d3-4f53-b79d-aacf54d222ea","shortId":"QER7mS","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 endpoint `/api/v1/policies/18` is one of many APIs offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. 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 maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is made via the `exact` scheme with a 300-second timeout. The response MIME type is `application/json`.\n\nNote that while the platform advertises many endpoints (metrics, reports, sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.), this specific listing is for `/api/v1/policies/18`, whose exact functionality beyond \"Premium API Access\" is not documented. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API","policies endpoint"],"warnings":["No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt","The exact purpose and request/response schema of /api/v1/policies/18 is unknown","No OpenAPI spec or ai-plugin manifest found","The endpoint name 'Premium API Access' is generic and does not describe actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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/18 is undescribed. The docs pages returned only 'Connect wallet' with no 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'/call':13,28 '0.02':12,27,76,131 '000':122 '0x8335':112 '20':121 '2913':113 '300':143 '6':127 'Base network API' 'USDC micropayment API' 'accept':103 'access':7,22,38,182 'actual':206 'addit':201 'advertis':157 'ai':63 'amount':118 'analysi':163 'analyt':62 'api':6,21,37,52,88,181 'application/json':151 'base':9,24,84,115,123 'base-network' 'beyond':179 'call':133 'categori':59 'challeng':97 'commit':93 'confirm':98 'connect':196 'contract':111 'data':61 'decim':128 'doc':187 'document':185,203 'embed':165 'endpoint':32,46,72,100,159,211 'equal':130 'etc':169 'exact':139,177 'feed':167 'financ':66 'function':178 'geocod':168 'includ':60 'infrastructur':69 'json-api' 'key':89 'learn':65 'limit':91 'list':172 'live':102 'low payment fee API' 'lowpaymentfee.com':34 'machin':64 'made':136 'mani':51,158 'maximum':117 'metric':160 'mime':148 'network':85 'no-api-key' 'no-rate-limit' 'note':152 'offer':53 'one':49 'page':191 'paid':79 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':42,108,134 'per':3,18,77,132 'platform':56,156 'policies endpoint' 'post':104 'premium':5,20,36,180 'price':74,166,188 'prompt':198 'protocol':43 'provid':35 'rate':90 'readm':190 'report':161 'request':4,19,78,105 'request/response':207 'requir':94,119 'respons':147 'return':193 'schema':208 'scheme':140 'second':144 'sentiment':162 'settl':107 'span':58 'specif':45,171 'summar':164 'technic':202 'timeout':145 'type':149 'unit':124 'unknown':213 'usdc':15,30,81,110,126 'usdc-settlement' 'util':70 'via':10,25,39,137 'wallet':197 'web3':67 'whose':176 'x402':11,26,41,96 'x402 premium API' 'x402-payment'","prices":[{"id":"d41524fb-18be-4af3-8693-f45add30e1aa","listingId":"d02caab9-86d3-4f53-b79d-aacf54d222ea","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:58.994Z"}],"sources":[{"listingId":"d02caab9-86d3-4f53-b79d-aacf54d222ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:58.994Z","lastSeenAt":"2026-04-23T06:31:18.455Z"}],"details":{"listingId":"d02caab9-86d3-4f53-b79d-aacf54d222ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/18 \\\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 minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base network with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/policies/18"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/18"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure 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","Programmatic access to policy data via x402 payment protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.575Z"},"updatedAt":"2026-04-23T06:31:18.455Z"}}