{"id":"0545a92b-67f5-4cfe-b31f-3eb8415a4dda","shortId":"mcvqt7","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 at `/api/v1/policies/16` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind `/api/v1/policies/16` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it actually returns upon successful payment is unknown from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/policies/16 ('Premium API Access') is entirely undocumented — it is unclear what data or service is returned upon payment.","No OpenAPI schema, request body schema, or response examples are available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/16","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/16","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. The docs, pricing, and API pages all render only a wallet-connect prompt with no useful 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'/request':159 '0.02':10,24,80,158 '000':84 '0x8335':71 '20':83 '2913':72 '402':212 '6':88 'Base network API' 'USDC API access' 'accept':62 'access':6,20,60,170 'across':115 'actual':220 'addit':202 'advertis':113 'ai':125 'analysi':129 'analyt':119 'api':5,19,41,59,91,169,191 'attach':102 'avail':229 'base':8,22,49,74,85 'base-network' 'behind':166 'beyond':174 'broader':111 'call':82 'caller':100 'categori':117 'challeng':213 'classif':132 'commit':97 'confirm':207 'connect':197 'content':203 'contract':70 'convers':149 'cost':78 'crawl':187 'data':118,122,216 'decim':89 'doc':188 'document':173 'embed':133 'endpoint':53,114,152,205 'estim':143 'exampl':184 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':165 'gas':142 'gate':3,17,42 'generat':150 'geocod':147 'header':106 'howev':162 'infrastructur':145 'insight':124 'key':92 'label':57 'learn':127 'limit':94 'list':154 'live':208 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':126 'materi':230 'maximum':77 'metric':120 'micropayment API' 'network':50 'no-api-key' 'offer':33 'openapi':180 'page':192 'pay':9,23,38 'pay-per-call API' 'pay-per-request':37 'payment':65,105,224 'per':11,25,39,81 'platform':32,112 'point':161 'post':63 'post-method' 'premium':4,18,58,168 'premium API' 'price':136,160,189 'prompt':199 'protocol':46 'quot':141 'rate':93,139 'report':121 'request':12,26,40,64,109 'request/response':183 'requir':99 'return':194,209,221 'schema':181 'sentiment':128 'servic':218 'settl':67 'simpli':101 'specif':52,164 'success':223 'suit':35 'summar':131 'text':130 'titl':176 'token':140 'unit':86 'unknown':226 'upfront':96 'upon':222 'usdc':14,28,69 'usdc-settlement' 'util':146 'valid':148,211 'wallet':198 'web3':135 'x402':2,16,45,104 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"db2762dc-b72b-40f3-acd4-ed58d9aae4e0","listingId":"0545a92b-67f5-4cfe-b31f-3eb8415a4dda","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:51.743Z"}],"sources":[{"listingId":"0545a92b-67f5-4cfe-b31f-3eb8415a4dda","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:51.743Z","lastSeenAt":"2026-04-23T08:01:37.272Z"}],"details":{"listingId":"0545a92b-67f5-4cfe-b31f-3eb8415a4dda","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/16 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/16"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/16"},{"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":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to gated endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.943Z"},"updatedAt":"2026-04-23T08:01:37.272Z"}}