{"id":"f4c7593f-5d57-49da-a09a-e8760efb4bf1","shortId":"zfufAF","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 hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settling payments in USDC. The specific endpoint at `/api/v1/policies/13` is listed as \"Premium API Access\" and returns a standard x402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform offers 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 priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/policies/13` is not documented beyond the label \"Premium API Access.\" No OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. Callers should treat this as a low-information endpoint until the provider publishes more detail about what data or service is actually returned.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-settlement","base-network","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","pay-per-call"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","premium API access","lowpaymentfee","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/policies/13 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec or request/response schema is available.","The endpoint name is generic — it is unclear what data or service is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/13","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/13","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 there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /policies/13 is completely undescribed. Docs pages returned only 'Connect wallet' with no 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'0.02':10,24,78,148 '000':72 '20':71 '402 payment endpoint' 'Base network API' 'USDC micropayment API' 'access':6,20,61,165 'across':107 'actual':215 'addit':191 'advertis':88 'ai':117 'analysi':121 'analyt':111 'api':5,19,41,60,82,164,180 'attach':91 'base':8,22,45,73 'base-network' 'behind':155 'beyond':160 'broader':103 'call':40 'caller':89,193 'categori':109 'challeng':67 'classif':124 'collect':32 'connect':186 'content':192 'convers':141 'data':110,114,211 'detail':172,208 'doc':177 'document':159,173 'embed':125 'endpoint':42,53,106,144,202 'estim':135 'exampl':170 'exchang':130 'export':115 'feed':129 'financ':126 'found':175 'four':108 'function':154 'gas':134 'gate':3,17 'generat':142 'geocod':139 'header':96 'host':30 'howev':151 'i.e':77 'inform':201 'infrastructur':137 'insight':116 'json-response' 'key':83 'label':162 'learn':119 'limit':86 'list':57 'low':200 'low-inform':199 'lowpaymentfee' 'lowpaymentfee.com':29 'machin':118 'metric':112 'network':46 'no-api-key' 'no-rate-limit' 'offer':105 'openapi':167 'page':181 'pay':9,23,38 'pay-per-cal':37 'pay-per-request API' 'payment':48,95,100 'per':11,25,39,79,149 'per-call-pricing' 'platform':104 'premium':4,18,59,163 'premium API access' 'price':128,146,178 'prompt':188 'proof':101 'protocol':36 'provid':205 'publish':206 'quot':133 'rate':85,131 'report':113 'request':12,26,80,150 'request/response':169 'requir':68 'return':63,183,216 'schema':168 'sentiment':120 'servic':213 'settl':47 'simpli':90 'specif':52,153 'standard':65 'summar':123 'text':122 'token':132 'treat':195 'unit':74 'usdc':14,28,50,76 'usdc-settlement' 'util':138 'valid':99,140 'wallet':187 'web3':127 'x':94 'x-payment':93 'x402':2,16,35,66 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':34","prices":[{"id":"f92835ff-2c15-42bf-92a4-1a9694dbc6ec","listingId":"f4c7593f-5d57-49da-a09a-e8760efb4bf1","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:00.207Z"}],"sources":[{"listingId":"f4c7593f-5d57-49da-a09a-e8760efb4bf1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:00.207Z","lastSeenAt":"2026-04-23T06:31:18.500Z"}],"details":{"listingId":"f4c7593f-5d57-49da-a09a-e8760efb4bf1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/policies/13"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/policies/13"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless pay-per-call API access","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring free or fiat-only payment methods","Use cases needing high-throughput batch access (no documented bulk pricing)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.512Z"},"updatedAt":"2026-04-23T06:31:18.500Z"}}