{"id":"04731504-daae-4da7-be1d-b41ec9f55103","shortId":"uFNkTK","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-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/claims/69` is listed as \"Premium API Access\" and its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/claims/69` (labeled generically as \"Premium API Access\") is unclear and does not map obviously to any of the named catalog endpoints. Agents should treat this as a low-documentation endpoint with uncertain output.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","serverless api marketplace"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no usable content (only 'Connect wallet')","The purpose of /api/v1/claims/69 ('Premium API Access') is unclear and does not correspond to any named endpoint in the catalog","No example request or response payloads are documented anywhere","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/69","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 a landing page, and the specific purpose of /api/v1/claims/69 is ambiguous. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/claims/69':109,209 '/docs':174 '/pricing':175 '/readme':178 '/request':17,34 '0.02':16,33,93,136 '000':125 '0x8335':130 '20':124 '2913':131 '402':118 '402 payment api' 'accept':159 'access':115,215 'across':50 'actual':206 'advertis':120 'agent':230 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,114,147,214 'application/json':164 'avail':204 'base':7,24,100,126,133 'base usdc api' 'base-network' 'behind':208 'beyond':166 'broad':46 'call':91 'catalog':47,228 'categori':52 'challeng':119 'classif':66 'classification' 'commit':155 'connect':184 'content':190 'convers':83 'data':9,26,53 'data-analytics' 'document':165,199,238 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,49,86,108,158,229,239 'equal':135 'estim':77 'exact':143 'exampl':202 'exchang':72 'export':57 'expos':44 'extrem':171 'feed':71 'financ':11,28,68 'finance-data' 'four':51 'function':207 'gas':76 'gate':3,20 'generat':84 'generic':211 'geocod':81 'geocoding' 'http':160 'infrastructur':79 'insight':58 'json-api' 'key':148 'label':210 'land':168 'learn':61 'limit':151 'list':111 'low':237 'low payment fee' 'low-document':236 'lowpaymentfee.com':35 'machin':60 'made':139 'map':221 'maxamountrequir':122 'metric':55 'micropayment api' 'name':227 'network':101 'no-api-key' 'obvious':222 'offer':8,25 'openapi':194 'output':242 'page':169,179 'pay':89 'pay per call api' 'pay-per-cal':88 'pay-per-request' 'payload':203 'payment':137 'per':90 'platform':5,22,42 'post':161 'premium':113,213 'price':70 'prompt':186 'protocol':105 'quot':75 'rate':73,150 'render':181 'report':56 'request/response':197 'requir':156 'return':163 'schema':198 'scheme':144 'sentiment':62 'sentiment-analysis' 'serverless api marketplace' 'settl':95 'spars':172 'spec':195 'specif':107 'substant':189 'summar':65 'text':64 'text-summarization' 'token':74 'treat':232 'uncertain':241 'unclear':217 'unit':127 'upfront':154 'usdc':97,129 'usdc-settlement' 'util':13,30,80 'valid':82 'via':102,140 'wallet':185 'web3':69 'x402':2,19,39,104,142 'x402 api' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"18d0ce44-60be-434a-8589-8f9e599f62cb","listingId":"04731504-daae-4da7-be1d-b41ec9f55103","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:00.340Z"}],"sources":[{"listingId":"04731504-daae-4da7-be1d-b41ec9f55103","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:00.340Z","lastSeenAt":"2026-04-22T16:31:19.954Z"}],"details":{"listingId":"04731504-daae-4da7-be1d-b41ec9f55103","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/69 \\\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":"All endpoints priced at $0.02/request with no API keys, no rate limits, settled on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Catalog includes Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/69"},{"claim":"Endpoint accepts POST and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/claims/69"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations such as geocoding, validation, and data conversion","Paying for API access with USDC on Base without needing API keys or accounts"],"bestFor":["Agents or developers who want zero-signup, pay-per-use API access","Crypto-native workflows that can settle micropayments in USDC on Base","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating","Non-crypto users who cannot make x402 USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.935Z"},"updatedAt":"2026-04-22T16:31:19.954Z"}}