{"id":"9fe3eb47-683b-4ae9-b338-d3509843f387","shortId":"3yLycZ","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":"lowpaymentfee.com is a platform offering a suite of pay-per-request APIs gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/policies/15` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requiring payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD.\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 with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality behind `/api/v1/policies/15` is not documented. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. The endpoint is confirmed live (402 challenge captured), but its actual behavior after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","premium-api","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-gated API"],"warnings":["No documentation available for /api/v1/policies/15 — actual response payload is unknown","All crawled subpages (docs, api, pricing, README) returned only 'Connect wallet' with no content","No OpenAPI or schema definition found","The specific purpose of 'Premium API Access' at /policies/15 is not described anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/15","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/15","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 clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the /policies/15 endpoint actually returns. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'0.02':10,24,94,141 '000':85 '0x8335':73 '20':84 '2913':74 '402':66,208 '6':90 'Base network API' 'USDC micropayment API' 'access':6,20,60 'across':101 'actual':213 'addit':181 'advertis':99 'ai':111 'amount':79 'analysi':115 'analyt':105 'api':5,19,41,59,146,168 'base':8,22,49,76,86 'behavior':214 'behind':159 'broader':97 'call':82 'captur':210 'categori':103 'challeng':67,209 'classif':118 'commit':154 'confirm':206 'connect':176 'content':182 'contract':72 'convers':134 'crawl':165 'crypto-gated API' 'data':104,108,196 'decim':91 'descript':193 'doc':166 'document':163 'embed':119 'endpoint':53,100,137,201,204 'equal':93 'estim':129 'exampl':190 'exchang':124 'export':109 'feed':123 'financ':120 'four':102 'function':158 'gas':128 'gate':3,17,42 'generat':135 'geocod':132 'howev':155 'infrastructur':131 'insight':110 'json-response' 'key':147 'learn':113 'limit':150 'list':56 'live':207 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':112 'maximum':78 'metric':106 'minimum':153 'network':50 'offer':33 'openapi':186 'page':171 'particular':200 'pay':9,23,38 'pay-per-call API' 'pay-per-request':37 'payment':69,216 'per':11,25,39,81,142 'platform':32,98 'premium':4,18,58 'premium-api' 'price':122,139,167 'prompt':178 'protocol':46 'quot':127 'rate':125,149 'readm':170 'report':107 'request':12,26,40,143 'request/response':189 'requir':68,80 'return':62,173,202 'schema':187 'sentiment':114 'servic':198 'specif':52,157 'standard':64 'suit':35 'summar':117 'text':116 'token':126 'unit':87 'unknown':218 'usd':95 'usdc':14,28,71,89 'usdc-base' 'valid':133 'wallet':177 'web3':121 'x402':2,16,45,65 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"256380ed-8920-4f8f-8cbb-72e952bb1e5e","listingId":"9fe3eb47-683b-4ae9-b338-d3509843f387","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:54.104Z"}],"sources":[{"listingId":"9fe3eb47-683b-4ae9-b338-d3509843f387","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:54.104Z","lastSeenAt":"2026-04-23T08:01:37.357Z"}],"details":{"listingId":"9fe3eb47-683b-4ae9-b338-d3509843f387","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/15 \\\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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/15"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/15"},{"claim":"Platform offers APIs 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 API keys or subscriptions","Programmatic pay-as-you-go access to gated endpoints"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.802Z"},"updatedAt":"2026-04-23T08:01:37.357Z"}}