{"id":"88699048-199c-401a-ae59-cf79ef28fff3","shortId":"wWhNuC","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/claims/25` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/claims/25` endpoint actually returns. The endpoint is live (confirmed via 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides or what request body it expects.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","data"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","claims API","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/claims/25 ('Premium API Access') is undocumented and unclear","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/claims/25 endpoint actually does beyond the label 'Premium API Access'. The docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66,199 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,213 'across':108 'actual':191 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,159,212 'attach':95 'base':8,23,51,73 'bodi':218 'broader':104 'call':4,19,80 'categori':110 'challeng':67,200 'claims API' 'classif':125 'confirm':197 'connect':168 'content':174 'convers':142 'data':111,115,208 'descript':185 'doc':158 'document':153,203 'embed':126 'endpoint':55,107,145,190,194 'estim':136 'exampl':182 'exchang':131 'expect':220 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'function':210 'gas':135 'generat':143 'geocod':140 'header':99 'howev':152 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':196 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,211 'premium API access' 'price':129,147,160 'prompt':170 'protocol':44 'provid':214 'quot':134 'rate':88,132 'readm':162 'render':165 'report':114 'request':37,68,102,151,217 'request/response':181 'return':64,192 'schema':179 'sentiment':121 'simpli':94 'spars':156 'specif':54 'summar':124 'text':123 'token':133 'unclear':206 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25,198 'wallet':169 'web3':128 'without':202 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"958cbaa5-b751-42db-bd9c-1ddb10bc9867","listingId":"88699048-199c-401a-ae59-cf79ef28fff3","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:42.252Z"}],"sources":[{"listingId":"88699048-199c-401a-ae59-cf79ef28fff3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:42.252Z","lastSeenAt":"2026-04-24T10:32:39.579Z"}],"details":{"listingId":"88699048-199c-401a-ae59-cf79ef28fff3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/25 \\\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":"Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/25"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/25"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or rate-limited tiers","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.751Z"},"updatedAt":"2026-04-24T10:32:39.579Z"}}