{"id":"4b3329c5-d2be-43df-9466-4558a2ad69b1","shortId":"jSNkrU","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 marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The 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 $0.02 per request.\n\nThe specific endpoint at `/api/v1/claims/35` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" payment scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts HTTP POST and has a 300-second payment timeout. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all resolve to a wallet-connect stub with no additional content. There is no OpenAPI spec, no request/response schema, and no example payloads available. It is unclear what data the `/api/v1/claims/35` endpoint actually returns, as the description is generic (\"Premium API Access\"). The platform appears to be a demonstration or early-stage deployment of x402 micropayment-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["micropayment API","x402 API","pay-per-call API","USDC API","Base network API","low fee API","crypto-paid API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt with no content.","No OpenAPI or request/response schema provided; it is unknown what this endpoint actually returns.","The endpoint name 'Premium API Access' is generic and does not describe functionality.","Platform may be a demo or early-stage deployment; no SLAs or reliability information available.","Cannot verify that any of the advertised AI, finance, or utility endpoints actually function beyond returning 402 challenges."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/35","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/35","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 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The description 'Premium API Access' is generic and does not clarify what data is returned. The docs, pricing, and README pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/claims/35':111,219 '/docs':182 '/pricing':183 '/readme':186 '/request':17,34 '0.02':16,33,104,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':132 '20':126 '2913':133 '300':158 '402 payment API' '6':136 'Base network API' 'USDC API' 'accept':152 'access':116,170,230 'actual':221 'addit':198 'address':148 'advertis':61,169 'ai':10,27,73 'ai-inference' 'analysi':77 'analyt':67 'api':4,21,41,65,115,163,229,248 'appear':233 'avail':212 'base':7,24,57,128,135 'base-network' 'behind':49 'call':176 'categori':63 'challeng':122 'classif':80 'connect':194 'content':199 'convers':97 'crypto-paid API' 'data':9,26,66,70,217 'data-analytics' 'decim':137 'demonstr':237 'deploy':242 'descript':225 'document':177 'earli':240 'early-stag':239 'embed':81 'embeddings' 'endpoint':14,31,48,100,109,151,220 'estim':91 'exact':141 'exampl':210 'exchang':86 'export':71 'extrem':179 'feed':85 'financ':11,28,82 'finance-data' 'four':62 'gas':90 'gate':3,20,44,247 'generat':98 'generic':227 'geocod':95 'geocoding' 'http':153 'infrastructur':93 'insight':72 'key':164 'label':113 'learn':75 'limit':167 'list':102 'live':120 'low fee API' 'lowpaymentfee.com':35 'machin':74 'marketplac':42 'metric':68 'micropay':54,246 'micropayment API' 'micropayment-g':245 'network':58 'no-api-key' 'offer':8,25 'openapi':203 'page':187 'pay':174 'pay-per-cal':173 'pay-per-call API' 'payload':211 'payment':142,144,160 'per':51,105,175 'per-request':50 'per-request-billing' 'platform':5,22,60,232 'post':154 'premium':114,228 'price':84 'protocol':40 'pure':172 'quot':89 'rate':87,166 'report':69 'request':52,106,123 'request/response':206 'resolv':189 'return':118,222 'schema':207 'scheme':143 'second':159 'sent':146 'sentiment':76 'sentiment-analysis' 'spars':180 'spec':204 'specif':108 'stage':241 'stub':195 'summar':79 'text':78 'text-summarization' 'timeout':161 'token':88 'unclear':215 'unit':129 'usdc':53,131 'usdc-micropayment' 'util':13,30,94 'utility-apis' 'valid':96 'varieti':46 'via':139 'wallet':193 'wallet-connect':192 'web3':83 'x402':2,19,39,121,244 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e919c022-901c-4a4d-a98e-cf1012725f2e","listingId":"4b3329c5-d2be-43df-9466-4558a2ad69b1","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:51.281Z"}],"sources":[{"listingId":"4b3329c5-d2be-43df-9466-4558a2ad69b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:51.281Z","lastSeenAt":"2026-04-23T01:01:25.529Z"}],"details":{"listingId":"4b3329c5-d2be-43df-9466-4558a2ad69b1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and no minimums.","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/claims/35 endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/claims/35"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, so 20000 base units = $0.02.","source_url":"https://lowpaymentfee.com/api/v1/claims/35"}],"useCases":["Paying per-request for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) via micropayments","Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis","Demonstrating x402 protocol integration for agent-to-agent commerce"],"bestFor":["Developers exploring x402 micropayment protocol integration","Agents needing keyless, pay-per-call API access on Base","Low-volume or sporadic API consumers who want no subscriptions or commitments"],"notFor":["High-volume production workloads (no documented SLAs, rate limits, or reliability guarantees)","Users who need detailed API documentation or well-defined request/response schemas","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.309Z"},"updatedAt":"2026-04-23T01:01:25.529Z"}}