{"id":"0fdaed09-153e-48ea-9679-a63d75921098","shortId":"84FfDx","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 is a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/claims/42` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind `/api/v1/claims/42` (\"Premium API Access\") is not described beyond its title, so its actual behavior is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-gateway","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","USDC api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/claims/42 ('Premium API Access') is not described anywhere; its request format and response structure are unknown.","The breadth of advertised endpoints (AI, finance, analytics, utilities) could not be independently verified — only the claims/42 endpoint was probed.","No examples, error codes, or rate-limit details are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint titles, and the specific purpose of /api/v1/claims/42 is undocumented. Effectively a stub 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'/api/v1/claims/42':57,197 '/docs':159 '/pricing':160 '/readme':163 '/request':16,32 '0.02':15,31,81,151 '000':75 '20':74 '402':67 'USDC api' 'access':63,200 'actual':209 'advertis':91,109 'ai':9,25,121 'ai-inference' 'analysi':125 'analyt':8,24,115 'api':4,20,45,62,85,199 'attach':94 'avail':189 'base':7,23,52,76 'base network api' 'base-network' 'behavior':210 'behind':196 'beyond':204 'broader':107 'call':44 'caller':92 'categori':111 'challeng':68 'classif':128 'classification' 'collect':36 'connect':169 'content':175 'convers':145 'crawl':192 'data':114,118 'data-analytics' 'describ':203 'document':154,184 'embed':129 'embeddings' 'endpoint':13,29,46,56,113 'estim':139 'exampl':188 'exchang':134 'export':119 'extrem':156 'feed':133 'financ':10,26,130 'finance-data' 'four':110 'function':195 'gas':138 'gate':3,19 'generat':146 'geocod':143 'geocoding' 'header':99 'i.e':80 'infrastructur':141 'insight':120 'key':86 'learn':123 'limit':89 'list':59 'low payment fee' 'lowpaymentfee.com':33 'machin':122 'metric':116 'micropayment api' 'network':53 'openapi':179 'page':164 'pay':42 'pay per call api' 'pay-per-cal':41 'pay-per-request' 'payment':70,98,104 'per':43,82,152 'platform':108 'premium':61,198 'premium api access' 'price':132,149 'prompt':171 'proof':105 'protocol':40 'quot':137 'rate':88,135 'render':166 'report':117 'request':83,153 'request/response':182 'requir':69 'return':65 'schema':183 'sentiment':124 'sentiment-analysis' 'settl':47 'simpli':93 'spars':157 'spec':180 'specif':55,194 'suit':5,21 'summar':127 'text':126 'text-summarization' 'titl':206 'token':136 'unit':77 'unknown':212 'usag':187 'usdc':49,79 'usdc-settlement' 'util':12,28,142 'utility-apis' 'valid':102,144 'wallet':170 'web3':131 'x':97 'x-payment':96 'x402':2,18,39,103 'x402 api' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"cfb1a94d-49da-4b8a-a996-f26fe9199fa1","listingId":"0fdaed09-153e-48ea-9679-a63d75921098","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:50.095Z"}],"sources":[{"listingId":"0fdaed09-153e-48ea-9679-a63d75921098","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:50.095Z","lastSeenAt":"2026-04-23T06:31:03.587Z"}],"details":{"listingId":"0fdaed09-153e-48ea-9679-a63d75921098","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/42"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/42"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) via micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Accessing analytics metrics and reports without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-per-request API access","Use cases requiring low-cost micropayment-settled API calls on Base","Projects already holding USDC on Base that need quick utility or AI endpoints"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement adds overhead","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.397Z"},"updatedAt":"2026-04-23T06:31:03.587Z"}}