{"id":"20e8b49f-b9c1-4cda-a868-58f2dac65d33","shortId":"dThzBX","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource `/api/v1/claims/77` is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. Each request is paid individually at $0.02 in USDC (USD Coin on Base, contract 0x8335…2913) with no API keys, rate limits, or upfront commitments.\n\nThe x402 challenge was successfully captured: the endpoint returns HTTP 402 with a payment challenge requiring an `X-PAYMENT` header. The `maxAmountRequired` is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme, with a 300-second timeout. The response MIME type is `application/json`.\n\nThe broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual behavior and response schema of `/api/v1/claims/77` specifically is unknown. The endpoint name \"Premium API Access\" is generic and does not clarify what data or functionality it returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","claims endpoint","premium api"],"warnings":["The specific functionality of /api/v1/claims/77 is unknown — 'Premium API Access' is a generic label with no further description.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no technical content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The platform lists many endpoints across diverse categories but provides no detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/77","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the purpose of /api/v1/claims/77 is entirely opaque. The docs, pricing, and README pages all returned only 'Connect wallet' with no useful 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'/request':195 '0.02':10,28,86,138,194 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':94 '20000':129 '2913':95 '300':151 '402':115 '6':134 'Base network api' 'USDC micropayment api' 'access':6,24,44,232 'actual':217 'address':143 'advertis':163 'ai':72 'analysi':172 'analyt':71 'api':5,16,23,34,43,98,231 'application/json':159 'base':8,26,51,92,130 'behavior':218 'behind':45 'broader':161 'captur':110 'categori':68 'challeng':107,119 'claims endpoint' 'clarifi':238 'classif':175 'coin':90 'commit':104 'connect':207 'contract':93 'convers':187 'data':70,168,240 'decim':135 'detail':214 'doc':201 'document':199 'embed':176 'endpoint':38,61,112,164,228 'equal':137 'estim':184 'exact':147 'exchang':179 'export':169 'feed':178 'financ':75 'function':242 'gas':183 'gate':3,21 'generat':189 'generic':234 'geocod':185 'header':125 'howev':198 'http':114 'includ':69 'individu':84 'infrastructur':78 'insight':170 'json-response' 'key':17,35,99 'learn':74 'limit':101 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':73 'mani':60 'maxamountrequir':127 'metric':166 'mime':156 'name':229 'network':52 'no-api-key' 'no-rate-limit' 'offer':62 'one':58 'page':200 'paid':83 'pay':9,27 'pay-per-call api' 'payment':118,124,139 'paywal':48 'per':11,29 'per-request-billing' 'platform':65,162 'point':197 'premium':4,22,42,230 'premium api' 'price':177,196,202 'prompt':209 'provid':41 'quot':182 'rate':100,180 'readm':203 'report':167 'request':12,30,81 'requir':18,36,120 'resourc':55 'respons':155,220 'return':113,204,244 'schema':221 'scheme':148 'second':152 'sent':141 'sentiment':171 'span':67 'specif':54,224 'success':109 'summar':174 'technic':213 'text':173 'timeout':153 'token':181 'type':157 'unit':131 'unknown':226 'upfront':103 'usd':89 'usdc':14,32,88,133 'usdc-base' 'use':145 'util':79 'valid':186 'wallet':208 'web3':76 'x':123 'x-payment':122 'x402':2,20,47,106 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"85aca672-f828-45ad-876c-3a2a76d42d20","listingId":"20e8b49f-b9c1-4cda-a868-58f2dac65d33","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:00.913Z"}],"sources":[{"listingId":"20e8b49f-b9c1-4cda-a868-58f2dac65d33","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:00.913Z","lastSeenAt":"2026-04-23T19:01:07.973Z"}],"details":{"listingId":"20e8b49f-b9c1-4cda-a868-58f2dac65d33","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/77 \\\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":"The endpoint returns HTTP 402 with x402 challenge requiring X-PAYMENT header, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/77"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/77"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402 payment capability on Base","Prototyping x402 integrations at low cost ($0.02/call)"],"notFor":["Users who need detailed documentation or response schema guarantees before calling","High-volume use cases where per-request crypto payments add overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.848Z"},"updatedAt":"2026-04-23T19:01:07.973Z"}}