{"id":"4ef34e9e-6bf2-4a22-a8a0-407d170ff8f5","shortId":"jrKK8g","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/claims/70` 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. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific `/api/v1/claims/70` path is labeled \"Premium API Access\" in the x402 challenge but does not appear in the site's public API listing, so its exact functionality is unclear. The 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.\n\nPayment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the wallet `0x1A2B…85F3` on Base. The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-response","http-post"],"categories":["api-gateway","misc"],"synonyms":["premium API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","claims endpoint"],"warnings":["The specific endpoint /api/v1/claims/70 is not listed among the site's publicly advertised APIs — its exact purpose is unknown.","No documentation, OpenAPI spec, or example request/response bodies are available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The platform lists many endpoints but none have documented schemas or detailed descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/claims/70 is undocumented. No OpenAPI schema, no request/response examples, and all doc pages render only a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':149 '0.02':10,24,66,148,181 '000':178 '0x1a2b':190 '20':177 '6':185 '85f3':191 'Base network API' 'USDC micropayment API' 'accept':196 'access':92 'advertis':117 'ai':55 'analysi':126 'analyt':54 'api':5,19,51,75,91,106 'appear':100 'application/json':201 'attach':163 'base':8,22,71,179,193 'broader':115 'call':64 'caller':162 'challeng':96 'claims endpoint' 'classif':129 'collect':42 'commit':82 'connect':225 'convers':141 'cost':65 'crawl':214 'data':53,122 'decim':186 'detail':205 'doc':216 'document':206 'embed':130 'endpoint':6,20,30,118,195 'estim':138 'exact':110,159 'exact-pay':158 'exampl':208 'exchang':133 'export':123 'feed':132 'financ':58 'found':211 'function':111 'gas':137 'gate':3,17 'generat':143 'geocod':139 'handl':154 'header':168 'http-post' 'infrastructur':61 'insight':124 'json-response' 'key':76 'label':89 'learn':57 'limit':79 'list':107 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'metric':120 'network':72 'offer':40 'openapi':203 'page':220 'part':34 'path':87 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payment':152,160,167,173 'per':11,25,49 'platform':38,116 'point':151 'post':197 'premium':4,18,90 'premium API' 'price':131,150,217 'prompt':227 'protocol':46 'public':105 'quot':136 'rate':78,134 'readm':219 'render':222 'report':121 'request':12,26,50,198 'requir':83 'respons':209 'return':200 'schema':204 'scheme':161 'sentiment':125 'sign':171 'sinc':182 'site':103 'span':52 'specif':85 'summar':128 'text':127 'token':135 'unclear':113 'unit':180 'usdc':14,28,68,172,183 'usdc-base' 'use':184 'util':62 'valid':140 'via':155 'wallet':189,226 'web3':59 'x':166 'x-payment':165 'x402':2,16,45,95,157 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"c246382a-9b5a-439e-9673-fd046efc726e","listingId":"4ef34e9e-6bf2-4a22-a8a0-407d170ff8f5","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:03.357Z"}],"sources":[{"listingId":"4ef34e9e-6bf2-4a22-a8a0-407d170ff8f5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:03.357Z","lastSeenAt":"2026-04-22T05:31:04.547Z"}],"details":{"listingId":"4ef34e9e-6bf2-4a22-a8a0-407d170ff8f5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/70 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x8335…2913) on Base, which equals $0.02.","source_url":"https://lowpaymentfee.com/api/v1/claims/70"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-request API services without API key registration","Making micropayment-gated API calls settled in USDC on Base","Programmatic agent-driven API consumption via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.729Z"},"updatedAt":"2026-04-22T05:31:04.547Z"}}