{"id":"dd66d64c-8f61-4571-a9f7-51ca5219e950","shortId":"GDKjxd","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/claims/30` is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is settled on-chain to a specified wallet address, with no API keys, rate limits, or subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 listed at the same $0.02/request price point.\n\nHowever, the `/api/v1/claims/30` endpoint does not clearly map to any of the named endpoints on the landing page. Its exact functionality is undocumented — the description is simply \"Premium API Access\" with no further detail. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive documentation. Without request/response schemas or examples, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","no-api-key","no-rate-limits","json-response"],"categories":["api-gateway","misc"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base network api","usdc api access","premium api"],"warnings":["The exact functionality of /api/v1/claims/30 is unknown — 'Premium API Access' is the only description provided.","All documentation pages (docs, pricing, API, README) returned no content beyond 'Connect wallet'.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path does not correspond to any of the named endpoints on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/30","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is completely undocumented. No request/response schemas, no examples, and all doc pages return only 'Connect wallet'. The endpoint name 'claims/30' doesn't match any listed API on the landing 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'/request':16,32,158 '0.02':15,31,86,157 '000':77 '20':76 '6':82 'accept':64 'access':62,190 'actual':219 'address':99 'advertis':72,112 'ai':9,25,124 'analysi':128 'analyt':8,24,118 'api':4,20,42,61,102,189,198 'base':7,23,51,68,78 'base network api' 'behavior':220 'broader':110 'call':41 'categori':114 'chain':94 'challeng':71 'classif':131 'clear':167 'collect':36 'connect':206 'convers':148 'data':117,121 'decim':83 'descript':185 'detail':194 'doc':196 'document':212 'embed':132 'endpoint':13,29,43,55,116,151,164,174,223 'equal':85 'estim':142 'exact':180 'exampl':217 'exchang':137 'export':122 'feed':136 'financ':10,26,133 'four':113 'function':181 'gas':141 'gate':3,19,44 'generat':149 'geocod':146 'howev':161 'infrastructur':144 'insight':123 'json-response' 'key':103 'land':177 'learn':126 'limit':105 'list':58,153 'low payment fee' 'lowpaymentfee.com':33 'machin':125 'map':168 'maxamountrequir':74 'metric':119 'micropayment api' 'name':173 'network':52 'no-api-key' 'no-rate-limits' 'offer':34 'on-chain':92 'page':178,201 'pay':39 'pay-per-cal':38 'pay-per-call api' 'pay-per-request' 'payment':66,89 'per':40,87 'platform':111 'point':160 'premium':60,188 'premium api' 'price':135,159,197 'prompt':208 'protocol':48 'quot':140 'rate':104,138 'readm':200 'remain':224 'report':120 'request':88 'request/response':214 'requir':108 'return':203 'schema':215 'sentiment':127 'settl':91 'simpli':187 'specif':54 'specifi':97 'subscript':107 'substant':211 'suit':5,21 'summar':130 'text':129 'token':139 'undocu':183 'unit':79 'unknown':225 'usdc':65,81 'usdc api access' 'usdc-on-base' 'util':12,28,145 'valid':147 'wallet':98,207 'web3':134 'without':213 'x402':2,18,47,70 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"97c3fb37-b58e-466d-8696-dd92d6324879","listingId":"dd66d64c-8f61-4571-a9f7-51ca5219e950","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:44.055Z"}],"sources":[{"listingId":"dd66d64c-8f61-4571-a9f7-51ca5219e950","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:44.055Z","lastSeenAt":"2026-04-22T07:00:55.881Z"}],"details":{"listingId":"dd66d64c-8f61-4571-a9f7-51ca5219e950","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/30 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/30"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/30"},{"claim":"All listed endpoints are priced at $0.02/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":["Paying per-call for API access without managing API keys or subscriptions","Agent-driven workflows that need on-chain micropayment-gated endpoints","Accessing analytics, AI inference, finance, or utility services via x402"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with Base USDC wallets needing programmatic endpoint access","Prototyping integrations without signup or rate-limit concerns"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.646Z"},"updatedAt":"2026-04-22T07:00:55.881Z"}}