{"id":"6e6ace0c-29ea-46f5-b503-3b500c9029f1","shortId":"pjTH24","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/claims/36` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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 per request price point. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json.\n\nNote that the specific functionality behind `/api/v1/claims/36` is not documented beyond the generic \"Premium API Access\" label. The crawled documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. Prospective callers should be aware that the precise input parameters and output format are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-platform","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","Base USDC API","pay-per-request API","claims API"],"warnings":["The specific functionality of /api/v1/claims/36 is not documented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; callers cannot know what parameters to send or what data to expect.","The platform lists many endpoint categories but it is unclear whether all are functional or placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/36","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/36","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 confirms pricing and payment details, but the actual functionality of /api/v1/claims/36 is entirely undocumented. No OpenAPI spec, no request/response schemas, and all documentation pages returned only 'Connect wallet' with no content. The endpoint's purpose beyond 'Premium API Access' is 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'/request':17,34 '0.02':16,33,77,155 '000':81 '20':80 '6':87 'Base USDC API' 'accept':169 'access':44,72,189 'actual':211 'advertis':110 'ai':10,27,122 'analysi':126 'analyt':116 'api':4,21,40,71,98,114,188 'application/json':173 'awar':223 'base':7,24,60,82 'behind':50,179 'beyond':184 'broader':108 'call':79 'caller':220 'categori':112 'challeng':162 'claims API' 'classif':129 'confirm':163 'connect':202 'content':208 'convers':146 'cost':74 'crawl':192 'data':9,26,115,119 'decim':88 'doc':195 'document':183,193 'embed':130 'endpoint':14,31,49,64,149,165,216 'estim':140 'exact':95 'exchang':135 'export':120 'feed':134 'financ':11,28,131 'format':231 'four':111 'function':178 'gas':139 'gate':3,20,43 'generat':147 'generic':186 'geocod':144 'handl':91 'infrastructur':142 'input':227 'insight':121 'json-api' 'key':99 'label':190 'learn':124 'limit':102 'list':68,151 'live':167 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropay':54 'network':61 'no-api-key' 'no-rate-limit' 'note':174 'offer':8,25 'output':230 'page':194 'paramet':228 'pay-per-request API' 'payment':89 'per':52,78,156 'per-request':51 'per-request-micropayment' 'platform':5,22,41,109 'point':159 'post':170 'post-method' 'precis':226 'premium':70,187 'price':133,158,196 'prompt':204 'prospect':219 'protocol':39 'quot':138 'rate':101,136 'readm':197 'report':118 'request':53,157,171 'request/response':212 'requir':106 'return':172,199 'schema':213 'scheme':96 'sentiment':125 'settl':55 'specif':63,177 'subscript':105 'substant':207 'summar':128 'text':127 'token':137 'undocu':233 'unit':83 'unknown':218 'usdc':57,85 'usdc-base' 'util':13,30,143 'valid':145 'varieti':47 'via':92 'wallet':203 'web3':132 'x402':2,19,38,94,161 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5482d5d1-ba77-466d-9c8c-5bf57ae42b68","listingId":"6e6ace0c-29ea-46f5-b503-3b500c9029f1","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:47.073Z"}],"sources":[{"listingId":"6e6ace0c-29ea-46f5-b503-3b500c9029f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:47.073Z","lastSeenAt":"2026-04-24T10:32:39.849Z"}],"details":{"listingId":"6e6ace0c-29ea-46f5-b503-3b500c9029f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/36 \\\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 a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/claims/36"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Micropayment-gated data retrieval where per-call billing is preferred","Testing x402 protocol integrations on the Base network"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, instant API access on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["High-volume consumers who need bulk pricing or rate guarantees","Users who need detailed API documentation and schemas before integrating","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.522Z"},"updatedAt":"2026-04-24T10:32:39.849Z"}}