{"id":"fcc0007c-d194-4598-8737-a9568659f5c9","shortId":"tV8Kht","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/policies/81` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nNote that while the platform advertises a broad suite of endpoints (sentiment analysis, text summarization, embeddings, price feeds, geocoding, etc.), this specific listing is for `/api/v1/policies/81`, whose exact functionality is labeled only as \"Premium API Access\" without further documentation. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. The lack of input/output schema documentation or usage examples means the actual behavior of this specific endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API"],"warnings":["The exact functionality of /api/v1/policies/81 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, input schema, or response examples are available.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but it is unclear which, if any, are fully functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's purpose ('Premium API Access') is entirely undocumented. No input/output schema, no examples, and all doc pages render only 'Connect wallet'. The actual functionality behind /api/v1/policies/81 cannot be determined from available 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'/call':13,28 '0.02':12,27,79,134 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x8335':115 '20':124 '2913':116 '300':145 '6':130 'Base network API' 'USDC API access' 'accept':106 'access':7,22,38,184 'actual':218 'addit':204 'address':141 'advertis':154 'ai':63 'amount':121 'analysi':161 'analyt':62 'api':6,21,37,91,183,191 'base':9,24,87,118,126 'base-network' 'behavior':219 'broad':156 'call':136 'categori':59 'challeng':100 'commit':96 'confirm':101 'connect':199 'contract':114 'data':61 'decim':131 'detail':206 'doc':189 'document':187,212 'embed':164 'endpoint':32,52,72,103,159,223 'equal':133 'etc':168 'exact':176 'exampl':215 'feed':166 'financ':66 'function':177 'geocod':167 'includ':60 'infrastructur':69 'input/output':210 'key':92 'label':179 'lack':208 'learn':65 'limit':94 'list':171 'live':105 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'mani':51 'max':120 'mean':216 'network':88 'no-api-key' 'note':149 'offer':53 'one':49 'page':194 'paid':82 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':42,111,137 'per':3,18,80,135 'platform':56,75,153 'post':107 'post-method' 'premium':5,20,36,182 'price':77,165,190 'prompt':201 'protocol':43 'provid':35 'rate':93 'readm':193 'render':196 'request':4,19,81,108 'requir':97,122 'resourc':46 'schema':211 'second':146 'sent':139 'sentiment':160 'settl':110 'span':58 'specif':45,170,222 'suit':157 'summar':163 'technic':205 'text':162 'timeout':147 'unclear':225 'unit':127 'usag':214 'usdc':15,30,84,113,129 'usdc-settlement' 'util':70 'via':10,25,39 'wallet':200 'web3':67 'whose':175 'window':148 'without':185 'x402':11,26,41,99 'x402 premium API' 'x402-payment'","prices":[{"id":"df31e596-07f9-4841-bd5b-9b62f823f260","listingId":"fcc0007c-d194-4598-8737-a9568659f5c9","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:03.855Z"}],"sources":[{"listingId":"fcc0007c-d194-4598-8737-a9568659f5c9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:03.855Z","lastSeenAt":"2026-04-23T06:31:18.613Z"}],"details":{"listingId":"fcc0007c-d194-4598-8737-a9568659f5c9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/81 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/81"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/policies/81"}],"useCases":["Accessing premium API services with per-request micropayments in USDC","Agent-driven API consumption without pre-registration or API keys","Programmatic access to paid endpoints using x402 payment headers"],"bestFor":["Developers wanting zero-signup, pay-as-you-go 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","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":"2026-02-17T23:14:02.32Z"},"updatedAt":"2026-04-23T06:31:18.613Z"}}