{"id":"dbfac84b-db31-494e-925d-d0606978ab8e","shortId":"s9KP2x","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":"This endpoint at lowpaymentfee.com is part of a suite of x402 protocol-gated APIs that accept per-request micropayments in USDC on the Base network. The specific resource `/api/v1/benefits/94` is labeled \"Premium API Access\" and returns JSON content. The x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (20000 / 10^6).\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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind `/api/v1/benefits/94` is not documented. The endpoint path does not match any of the named API categories on the landing page, and no OpenAPI schema, request/response examples, or detailed documentation were found. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the actual data or service returned by this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","micropayment"],"categories":["api","payments"],"synonyms":["premium API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["The specific endpoint /api/v1/benefits/94 is not listed among the named APIs on the landing page; its purpose is unknown.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no content.","The actual data or service returned after payment is unverified and undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/94","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/94","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 specific functionality of /api/v1/benefits/94 is entirely undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,93,147 '0x8335':87 '10':97 '20000':82,96 '2913':88 '6':98 'Base network API' 'USDC micropayment API' 'accept':51 'access':70 'across':105 'actual':220 'advertis':78 'ai':115 'analysi':119 'analyt':109 'api':5,22,49,69,152,181,201 'base':8,25,60,83,90 'behind':166 'broader':100 'call':12,29 'categori':107,182 'challeng':77 'classif':122 'commit':160 'connect':209 'content':74,215 'convers':139 'data':108,112,221 'detail':194 'doc':199 'document':170,195 'embed':123 'endpoint':6,23,36,104,142,172,228 'equal':92 'estim':133 'exampl':192 'exchang':128 'export':113 'feed':127 'financ':124 'found':197 'function':165 'gas':132 'gate':3,20,48 'generat':140 'geocod':137 'howev':162 'infrastructur':135 'insight':114 'json':73 'json-response' 'key':153 'label':67 'land':185 'learn':117 'limit':156 'lowpaymentfee' 'lowpaymentfee.com':38,101 'machin':116 'match':176 'maxamountrequir':80 'metric':110 'micropay':55 'micropayment' 'minimum':159 'name':180 'network':61 'no-api-key' 'offer':103 'openapi':189 'page':186,204 'part':40 'particular':227 'path':173 'pay':10,27 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request' 'per':11,28,53,94,148 'per-request':52 'platform':102 'premium':4,21,68 'premium API' 'price':126,145,200 'prompt':211 'protocol':47 'protocol-g':46 'quot':131 'rate':129,155 'readm':203 'remain':229 'report':111 'request':54,95,149 'request/response':191 'requir':161 'resourc':64 'result':218 'return':72,206,224 'schema':190 'sentiment':118 'servic':223 'sever':106 'specif':63,164 'substant':214 'suit':43 'summar':121 'text':120 'token':130 'unclear':230 'uniform':144 'unit':84 'usdc':14,31,57,86 'usdc-base' 'util':136 'valid':138 'wallet':210 'web3':125 'x402':2,19,45,76 'x402 endpoint' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"931e22e4-ab1e-43b6-bf3a-82a102a35986","listingId":"dbfac84b-db31-494e-925d-d0606978ab8e","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T20:29:37.684Z"}],"sources":[{"listingId":"dbfac84b-db31-494e-925d-d0606978ab8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T20:29:37.684Z","lastSeenAt":"2026-04-22T01:01:59.290Z"}],"details":{"listingId":"dbfac84b-db31-494e-925d-d0606978ab8e","quickStartSnippet":"# 1. Send a POST to get the 402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/benefits/94\n# 2. Parse the 402 JSON, pay 20000 USDC base units ($0.02) on Base\n# 3. Re-send POST with X-PAYMENT header containing the payment proof","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"x402 challenge returns maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/94"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/benefits/94"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services via a single micropayment per request","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to web services settled on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-friction micropayment experimentation"],"notFor":["Users needing well-documented API contracts with clear input/output schemas","High-volume consumers who need bulk pricing or rate guarantees","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.516Z"},"updatedAt":"2026-04-22T01:01:59.290Z"}}