{"id":"1fd927b4-2fe4-4a90-a9ba-bb8456f20e59","shortId":"pcKeFJ","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network, settled in USDC at $0.02/call.","tagline":"Pay-per-request premium API access via x402 on Base network, settled in USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints on the platform share the same pricing model: $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/policies/55` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The platform's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, geocoding, etc.), all at the same $0.02 price point. The x402 challenge confirms the endpoint is live, accepts POST requests, charges up to 20,000 base units of USDC (which equals $0.02 given USDC's 6 decimals), and settles to a specific wallet on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","paid endpoint","x402 API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet' with no content","The specific functionality of /api/v1/policies/55 ('Premium API Access') is not described anywhere","No OpenAPI schema or request/response examples available","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/55","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/55","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no schema, no request/response examples, and the specific functionality of /api/v1/policies/55 is entirely undescribed. This is effectively a stub 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'/call':18,36 '0.02':17,35,83,147,172 '000':165 '20':164 '6':176 'Base network API' 'USDC API' 'accept':158 'access':7,25,44,112 'addit':206 'ai':64 'analysi':135 'analyt':63 'api':6,24,43,95,111,192 'base':11,29,91,166,185 'base-network' 'beyond':120 'categori':72 'challeng':152 'charg':161 'classif':137 'commit':102 'confirm':153 'connect':201 'data':62,222 'decim':177 'descript':219 'detail':208 'doc':191 'document':119,186 'embed':138 'endpoint':38,55,74,106,131,155,227 'equal':171 'etc':142 'exact':115 'exampl':216 'extrem':188 'feed':140 'financ':67 'function':116,224 'geocod':141 'given':173 'http-post' 'infrastructur':70 'key':96 'label':109 'land':126 'learn':66 'limit':99 'list':128 'live':157 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':65 'mani':54 'metric':132 'micropayment API' 'model':82 'network':12,30,92 'no-api-key' 'numer':129 'offer':56 'one':52 'openapi':212 'page':127,196 'paid':86 'paid endpoint' 'particular':226 'pay':2,20 'pay-per-request':1,19 'payment':48 'per':3,21,84 'platform':59,77,124 'point':149 'post':159 'premium':5,23,42,110 'premium API' 'price':81,139,148,193 'prompt':203 'protocol':49 'provid':41 'rate':98 'readm':195 'render':198 'report':133 'request':4,22,85,160 'request/response':215 'requir':103 'return':228 'schema':213 'sentiment':134 'settl':13,31,179 'share':78 'span':61 'spars':189 'specif':105,182 'summar':136 'technic':207 'titl':122 'unit':167 'usdc':15,33,88,169,174 'usdc-settlement' 'util':71 'via':8,26,45 'wallet':183,202 'web3':68 'x402':9,27,47,151 'x402 API' 'x402-payment'","prices":[{"id":"a7cd7a0b-824d-4985-b4b4-add87e0b1d54","listingId":"1fd927b4-2fe4-4a90-a9ba-bb8456f20e59","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:02.025Z"}],"sources":[{"listingId":"1fd927b4-2fe4-4a90-a9ba-bb8456f20e59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:02.025Z","lastSeenAt":"2026-04-23T06:31:18.557Z"}],"details":{"listingId":"1fd927b4-2fe4-4a90-a9ba-bb8456f20e59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/55 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/55"},{"claim":"Platform charges $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/55"},{"claim":"maxAmountRequired is 20000 base units (= $0.02 with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/policies/55"}],"useCases":["Accessing premium data or services without needing an API key or subscription","Programmatic pay-per-call access for AI agents on Base network","Testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents that can settle payments in USDC on Base","Users who prefer crypto micropayments over traditional API key management"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring high-volume calls where per-request pricing is cost-prohibitive compared to subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.458Z"},"updatedAt":"2026-04-23T06:31:18.557Z"}}