{"id":"0807668b-2ed5-43b0-8116-0e8c375c5f7b","shortId":"VFqbUm","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settling payments in USDC. The specific endpoint `/api/v1/benefits/37` is listed as \"Premium API Access\" and returns a 402 challenge requiring an exact-scheme USDC payment on Base. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints across several 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 endpoint `/api/v1/benefits/37` does not appear in the site's public API listing, and its actual functionality is undocumented. The description \"Premium API Access\" is generic and does not clarify what data or service is returned. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API","x402 endpoint","USDC API","Base network API","micropayment API","pay-per-call API"],"warnings":["Endpoint /api/v1/benefits/37 is not listed in the site's public API catalog — its purpose is unknown","No documentation, OpenAPI schema, or response examples are available for this endpoint","All doc/pricing/API pages render only 'Connect wallet' with no substantive content","The description 'Premium API Access' is generic and does not describe actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/37","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/benefits/37","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 402 challenge, confirming it is operational. However, the specific endpoint /api/v1/benefits/37 is not listed on the site's public catalog, has no documentation, no OpenAPI schema, no request/response examples, and the description 'Premium API Access' is entirely generic. It is impossible to determine what this endpoint actually returns without 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'/request':17,34 '0.02':16,33,96,168 '000':87 '20':86 '402':70 '6':92 'Base network API' 'USDC API' 'access':66,196 'across':127 'actual':188 'addit':237 'advertis':106 'ai':137 'amount':83 'analysi':141 'analyt':131 'api':5,22,47,65,100,184,195,226 'appear':178 'attach':109 'base':8,25,51,80,88 'base-network' 'broader':122 'call':12,29 'caller':107 'categori':129 'challeng':71 'clarifi':202 'classif':144 'collect':38 'connect':232 'content':238 'convers':161 'data':130,134,204 'decim':93 'descript':193 'detail':215 'doc':223 'document':216 'embed':145 'endpoint':6,23,48,59,126,164,174,221 'equal':95 'estim':155 'exact':75 'exact-schem':74 'exampl':213 'exchang':150 'export':135 'feed':149 'financ':146 'found':218 'function':189 'gas':154 'gate':3,20 'generat':162 'generic':198 'geocod':159 'header':114 'host':36 'howev':171 'http-post' 'infrastructur':157 'insight':136 'key':101 'learn':139 'limit':104 'list':62,185 'lowpaymentfee.com':35,123 'machin':138 'max':82 'metric':132 'micropayment API' 'network':52 'no-api-key' 'offer':125 'openapi':210 'page':227 'paid API' 'pay':10,27,44 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':43 'payment':54,78,113,119 'per':11,28,45,97,169 'platform':124 'premium':4,21,64,194 'premium API' 'price':148,166,224 'prompt':234 'proof':120 'protocol':42 'public':183 'quot':153 'rate':103,151 'render':229 'report':133 'request':46,98,170 'request/response':212 'requir':72,84 'return':68,208 'schema':211 'scheme':76 'sentiment':140 'servic':206 'settl':53 'sever':128 'simpli':108 'site':181 'specif':58,173 'summar':143 'text':142 'token':152 'undocu':191 'unit':89 'usdc':14,31,56,77,91 'usdc-settlement' 'util':158 'valid':117,160 'wallet':233 'web3':147 'x':112 'x-payment':111 'x402':2,19,41,118 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"87fdba76-8fc3-42a0-be32-dc7d52807083","listingId":"0807668b-2ed5-43b0-8116-0e8c375c5f7b","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/benefits/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:40.171Z"}],"sources":[{"listingId":"0807668b-2ed5-43b0-8116-0e8c375c5f7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:40.171Z","lastSeenAt":"2026-04-22T04:02:19.662Z"}],"details":{"listingId":"0807668b-2ed5-43b0-8116-0e8c375c5f7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/37\n# Returns 402 with x402 challenge. Attach a valid X-PAYMENT header\n# with a USDC payment proof on Base (amount: 20000 base units = $0.02)\n# to receive the premium API response.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/37"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/37"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a gated API resource with per-call USDC micropayments on Base","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, no-signup API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or fiat-only payment methods","Anyone needing to understand the exact response payload before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.14Z"},"updatedAt":"2026-04-22T04:02:19.662Z"}}