{"id":"5846f849-7a12-4bbb-85a3-2e24e1b8b1b4","shortId":"NmBXqw","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settled in USDC. The specific endpoint at `/api/v1/policies/85` is listed as \"Premium API Access\" and returns a standard x402 challenge (HTTP 402) requiring an exact-scheme USDC payment on Base. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind `/api/v1/policies/85` is not documented — the name \"Premium API Access\" is generic and does not describe what data or service is returned. 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-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/policies/85 ('Premium API Access') is not described anywhere in the crawled content","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content","No OpenAPI spec, request schema, or response examples are available","It is unclear whether this endpoint returns real data or is a demonstration/placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/85","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/85","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, but the actual functionality behind /api/v1/policies/85 is completely undocumented. No OpenAPI schema, no request/response examples, and no meaningful documentation pages were found — all doc pages just show 'Connect wallet'. The listing is effectively a stub with only pricing and protocol details 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'0.02':10,29,103,151 '000':94 '20':93 '402':78 '6':99 'Base network API' 'USDC API' 'access':6,25,70,165,179 'across':111 'advertis':109 'ai':121 'amount':90 'analysi':125 'analyt':115 'api':5,24,51,69,158,178,207 'base':8,27,55,87,95 'base-network' 'behind':170 'broader':107 'call':50 'categori':113 'challeng':76 'classif':128 'collect':42 'connect':216 'content':222 'convers':144 'crawl':204 'data':114,118,187 'decim':100 'describ':185 'detail':198 'doc':206 'document':174,199 'embed':129 'emphas':156 'endpoint':52,62,110,147 'equal':102 'estim':139 'exact':82 'exact-schem':81 'exampl':196 'exchang':134 'export':119 'feed':133 'financ':130 'found':201 'four':112 'function':169 'gas':138 'gate':3,22 'generat':145 'generic':181 'geocod':142 'host':40 'howev':166 'http':77 'infrastructur':141 'insight':120 'instant':164 'json-response' 'key':16,35,159 'learn':123 'limit':19,38,162 'list':66 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':122 'max':89 'metric':116 'micropayment API' 'name':176 'network':56 'no-api-key' 'openapi':193 'page':211 'pay':9,28,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request' 'payment':85 'per':11,30,49,104,152 'platform':108,155 'premium':4,23,68,177 'premium API access' 'price':132,149,208 'prompt':218 'protocol':46 'quot':137 'rate':18,37,135,161 'readm':210 'report':117 'request':12,31,105,153 'request/response':195 'requir':79,91 'return':72,191,213 'schema':194 'scheme':83 'sentiment':124 'servic':189 'settl':57 'specif':61,168 'standard':74 'substant':221 'summar':127 'text':126 'token':136 'unit':96 'usdc':14,33,59,84,98 'usdc-settlement' 'valid':143 'wallet':217 'web3':131 'x402':2,21,45,75 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':44","prices":[{"id":"c1344fc9-2a51-4013-9179-73b06c363084","listingId":"5846f849-7a12-4bbb-85a3-2e24e1b8b1b4","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/85","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:01.455Z"}],"sources":[{"listingId":"5846f849-7a12-4bbb-85a3-2e24e1b8b1b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/85","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:01.455Z","lastSeenAt":"2026-04-23T06:31:18.554Z"}],"details":{"listingId":"5846f849-7a12-4bbb-85a3-2e24e1b8b1b4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/85 \\\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 an x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/85"},{"claim":"All endpoints are priced at $0.02 per request 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/85"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility endpoints"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Automated workflows needing instant access without signup"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.458Z"},"updatedAt":"2026-04-23T06:31:18.554Z"}}