{"id":"f8044ef5-7217-4d83-b33f-b3c25f5f4759","shortId":"UGebzY","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 x402-protocol pay-per-request APIs across multiple categories: data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint at `/api/v1/policies/17` is listed as \"Premium API Access\" and returns a standard x402 payment challenge when called without payment. It accepts USDC on the Base network at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/policies/17` \"Premium API Access\" endpoint is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint is confirmed live (returning a valid 402 challenge) but lacks any documentation about what data or service it actually provides, agents should treat this as a functional but opaque endpoint. The payment mechanics are clear and standard x402, but the actual payload returned after payment is unknown from available sources.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","pay-per-use"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-request API","USDC API access","Base network API"],"warnings":["No documentation exists for what this endpoint returns after payment","No OpenAPI or output schema available — response format is unknown","Docs, pricing, API, and README pages all render only 'Connect wallet' with no content","The endpoint title 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/17","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/17","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 on Base). However, there is zero documentation about what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific purpose of '/api/v1/policies/17' is entirely unknown beyond its 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'/request':157 '0.02':10,24,91,156 '000':95 '20':94 '402':212 '6':101 'Base network API' 'USDC API access' 'accept':81 'access':6,20,68,169 'across':45 'actual':224,246 'addit':201 'advertis':125 'agent':226 'ai':50 'analysi':134 'analyt':49 'api':5,19,44,67,104,168,190 'attach':114 'avail':254 'base':8,22,85,96 'behind':164 'beyond':174 'broader':123 'call':77 'caller':112 'categori':47 'challeng':75,213 'classif':137 'clear':240 'confirm':207 'connect':196 'content':202 'convers':149 'cost':89 'data':48,130,220 'decim':102 'doc':187 'document':173,217 'embed':138 'endpoint':60,126,170,205,235 'estim':146 'exampl':184 'exchang':141 'export':131 'feed':140 'financ':53 'function':163,232 'gas':145 'gate':3,17 'generat':151 'geocod':147 'header':118 'howev':160 'infrastructur':56 'insight':132 'json-response' 'key':105 'lack':215 'learn':52 'limit':107 'list':64 'live':208 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':51 'mechan':238 'metric':128 'multipl':46 'network':86 'no-api-key' 'no-rate-limit' 'offer':33 'opaqu':234 'openapi':180 'page':191 'pay':9,23,41 'pay-per-request':40 'pay-per-request API' 'payload':247 'payment':74,79,117,237,250 'per':11,25,42,92 'per-request-billing' 'platform':32,124 'point':159 'premium':4,18,66,167 'price':139,158,188 'prompt':198 'protocol':39 'provid':225 'quot':144 'rate':106,142 'render':193 'report':129 'request':12,26,43,93,121 'request/response':183 'requir':111 'return':70,209,248 'schema':181 'sentiment':133 'servic':222 'simpli':113 'sourc':255 'specif':59,162 'standard':72,242 'subscript':109 'suit':35 'summar':136 'text':135 'titl':176 'token':143 'treat':228 'unit':97 'unknown':252 'usdc':14,28,82,99 'usdc-base-network' 'util':57 'valid':148,211 'wallet':197 'web3':54 'without':78 'x402':2,16,38,73,116,243 'x402 premium API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':37","prices":[{"id":"4e2dc034-6816-488c-b7f9-06688ddcee92","listingId":"f8044ef5-7217-4d83-b33f-b3c25f5f4759","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:50.517Z"}],"sources":[{"listingId":"f8044ef5-7217-4d83-b33f-b3c25f5f4759","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:50.517Z","lastSeenAt":"2026-04-23T08:01:37.222Z"}],"details":{"listingId":"f8044ef5-7217-4d83-b33f-b3c25f5f4759","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/17 \\\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 requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/17"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/17"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to undisclosed premium content"],"bestFor":["Agents that need keyless, instant API access via x402","Developers testing x402 payment flows on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or schema before calling an endpoint","Applications requiring guaranteed SLA or support contracts","Anyone who needs to know the exact response format before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.949Z"},"updatedAt":"2026-04-23T08:01:37.222Z"}}