{"id":"9e221541-33ce-44c1-ae44-08bec8a50e41","shortId":"D4EsNT","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 `/api/v1/claims/48` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The endpoint is labeled \"Premium API Access\" and is gated behind an x402 payment challenge requiring USDC on the Base network.\n\nThe x402 challenge specifies a maximum amount of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per request. Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nHowever, the specific functionality behind `/api/v1/claims/48` is not documented. The site's landing page lists numerous API categories (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, generation) all priced at $0.02/request, but this particular claims endpoint does not appear among them. No OpenAPI schema, request/response examples, or detailed documentation were found — the docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. The actual input parameters and response format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api","misc"],"synonyms":["premium API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","claims endpoint"],"warnings":["The specific functionality of /api/v1/claims/48 is undocumented — it does not appear in the site's listed API catalog","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content","No OpenAPI schema, request parameters, or response format available","The purpose of the 'claims' resource is unknown — could be a test or internal endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/48","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/claims/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what this specific endpoint does, no request/response schema, no examples, and the docs pages are empty. The '/claims/48' path doesn't match any listed API on the site. This is effectively a stub 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'/request':17,34,175 '0.02':16,33,112,174 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':124 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':105 '20':98 '300':127 '6':108 'Base network API' 'USDC micropayment API' 'accept':132 'access':75 'actual':215 'address':123 'ai':61 'among':184 'amount':96 'analysi':159 'analyt':60 'api':5,22,57,74,154,198 'appear':183 'application/json':137 'asset':104 'base':8,25,88,100 'behind':79,142 'call':12,29 'categori':155 'challeng':83,92 'claim':179 'claims endpoint' 'classif':161 'collect':48 'connect':207 'content':213 'convers':169 'data':59 'decim':109 'detail':192 'doc':197 'document':146,193 'embed':162 'endpoint':6,23,36,70,131,180,223 'equat':110 'exact':120 'exampl':190 'exchang':165 'feed':164 'financ':64 'format':220 'found':195 'function':141 'gate':3,20,78 'generat':170 'geocod':167 'howev':138 'infrastructur':67 'input':216 'json-response' 'label':72 'land':150 'learn':63 'list':152 'lowpaymentfee' 'lowpaymentfee.com':43 'machin':62 'made':117 'maximum':95 'metric':156 'network':89 'numer':153 'offer':46 'openapi':187 'page':151,202 'paramet':217 'part':40 'particular':178 'pay':10,27,54 'pay-per-cal':9,26 'pay-per-call API' 'pay-per-request':53 'payment':82,115 'per':11,28,55,113 'platform':44 'post':133 'post-method' 'premium':4,21,73 'premium API' 'price':163,172,199 'prompt':209 'protocol':52 'rate':166 'readm':201 'remain':224 'render':204 'report':157 'request':56,114,134 'request/response':189 'requir':84 'respons':219 'return':136 'schema':188 'scheme':121 'second':128 'sentiment':158 'site':148 'span':58 'specif':140 'specifi':93 'substant':212 'summar':160 'timeout':129 'unit':101 'unknown':225 'usdc':14,31,85,103 'usdc-base' 'use':107 'util':68 'valid':168 'via':118 'wallet':208 'web3':65 'x402':2,19,51,81,91 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"67b1e273-cc0e-49fd-8428-b2f5033e5169","listingId":"9e221541-33ce-44c1-ae44-08bec8a50e41","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/claims/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:47.700Z"}],"sources":[{"listingId":"9e221541-33ce-44c1-ae44-08bec8a50e41","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:47.700Z","lastSeenAt":"2026-04-22T07:00:56.053Z"}],"details":{"listingId":"9e221541-33ce-44c1-ae44-08bec8a50e41","quickStartSnippet":"# 1. Probe the endpoint to get the x402 challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/48\n# Returns 402 with x402 payment challenge in body\n# 2. Construct X-PAYMENT header per x402 spec, sign USDC tx on Base\n# 3. Replay request with payment header\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/48 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requires 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/claims/48"},{"claim":"The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a gated API resource with per-request USDC micropayments on Base","Programmatic agent-driven API consumption without API keys or subscriptions","Demonstrating x402 protocol payment flows"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that can settle USDC payments on Base L2","Users who want keyless, commitment-free API access"],"notFor":["Users needing well-documented, production-grade APIs with clear schemas","Anyone without a Base-compatible USDC wallet","Use cases requiring high-volume, low-latency calls where per-request payment overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.516Z"},"updatedAt":"2026-04-22T07:00:56.053Z"}}