{"id":"483d6ce8-4c44-47d1-9d81-f190bad205be","shortId":"DX6e3F","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 in USDC. The specific endpoint `/api/v1/benefits/34` 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 to access the resource.\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\nThe `/api/v1/benefits/34` endpoint itself is not clearly documented beyond its title \"Premium API Access.\" There is no OpenAPI schema, no detailed documentation of request/response formats, and the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind this specific path is unknown. Callers should be aware that the response format (application/json) is declared in the challenge but no output schema details are provided.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access","lowpaymentfee","402 payment endpoint"],"warnings":["No documentation available for this specific endpoint — purpose and response format are unknown","All docs/pricing/API pages return only 'Connect wallet' with no usable content","No OpenAPI or output schema provided beyond mimeType: application/json","The path '/api/v1/benefits/34' does not correspond to any of the documented endpoint categories on the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/34","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/34","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, but there is no documentation of what /api/v1/benefits/34 actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint's purpose beyond 'Premium API Access' is entirely 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'/request':17,34 '0.02':16,33,95,171 '000':86 '20':85 '402':69,226 '402 payment endpoint' '6':91 'Base network API' 'USDC micropayment API' 'access':65,121,187 'across':130 'actual':230 'addit':216 'advertis':105 'ai':140 'amount':82 'analysi':144 'analyt':134 'api':5,22,47,64,99,186,205 'application/json':246 'attach':108 'awar':241 'base':8,25,51,79,87 'base-network' 'behind':232 'beyond':182 'broader':125 'call':12,29 'caller':106,238 'categori':132 'challeng':70,227,251 'classif':147 'clear':180 'collect':38 'confirm':221 'connect':211 'content':217 'convers':164 'crawl':201 'data':133,137 'decim':92 'declar':248 'detail':194,256 'doc':202 'document':181,195 'embed':148 'endpoint':6,23,48,58,129,167,176,219 'equal':94 'estim':158 'exact':74 'exact-schem':73 'exchang':153 'export':138 'feed':152 'financ':149 'format':198,245 'function':231 'gas':157 'gate':3,20 'generat':165 'geocod':162 'header':113 'host':36 'infrastructur':160 'insight':139 'json-response' 'key':100 'learn':142 'limit':103 'list':61 'live':222 'lowpaymentfee' 'lowpaymentfee.com':35,126 'machin':141 'max':81 'metric':135 'network':52 'no-api-key' 'offer':128 'openapi':191 'output':254 'page':206 'path':235 'pay':10,27,44 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':43 'payment':77,112,118 'per':11,28,45,96,172 'platform':127 'premium':4,21,63,185 'premium API access' 'price':151,169,203 'prompt':213 'proof':119 'protocol':42 'provid':258 'quot':156 'rate':102,154 'report':136 'request':46,97,173 'request/response':197 'requir':71,83 'resourc':123 'respons':244 'return':67,208 'schema':192,255 'scheme':75 'sentiment':143 'settl':53 'sever':131 'simpli':107 'specif':57,234 'summar':146 'text':145 'titl':184 'token':155 'unit':88 'unknown':237 'usdc':14,31,55,76,90 'usdc-settlement' 'util':161 'valid':116,163,225 'via':223 'wallet':212 'web3':150 'x':111 'x-payment':110 'x402':2,19,41,117 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"756ac027-afe7-4a4b-bab1-59d5aada9958","listingId":"483d6ce8-4c44-47d1-9d81-f190bad205be","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:38.956Z"}],"sources":[{"listingId":"483d6ce8-4c44-47d1-9d81-f190bad205be","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:38.956Z","lastSeenAt":"2026-04-22T04:02:19.613Z"}],"details":{"listingId":"483d6ce8-4c44-47d1-9d81-f190bad205be","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/34 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/34"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/34"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.267Z"},"updatedAt":"2026-04-22T04:02:19.613Z"}}