{"id":"ffd51bcd-2854-4cf4-92d7-ffd8e3c8fd9f","shortId":"JKNGbB","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/ehr/81` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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\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 example payloads available. The specific purpose of the `/api/v1/ehr/81` endpoint (the \"ehr\" path segment suggests electronic health records) is not documented anywhere on the site, making it unclear what data or functionality this particular endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["data","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","EHR API","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","The path segment 'ehr' may refer to electronic health records, which is a regulated data category (HIPAA, etc.) — no compliance information is provided","No request or response schema is documented; callers cannot know what to send or what they will receive","No OpenAPI or machine-readable spec available","The endpoint description is generic ('Premium API Access') and does not explain what data or service is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/81","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/ehr/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the /ehr/81 endpoint accepts or returns. No OpenAPI spec, no examples, no request/response schemas. The docs pages are empty. The 'ehr' path segment is unexplained and potentially refers to electronic health records, which would be a regulated data 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'/api/v1/ehr/81':67,213 '/docs':177 '/pricing':178 '/readme':181 '/request':17,34 '0.02':16,33,95,169 '000':87 '0x8335':92 '20':86 '6':100 'Base network API' 'EHR API' 'USDC API' 'accept':75 'access':45,73 'across':129 'advertis':127 'ai':10,27,139 'analysi':143 'analyt':133 'anywher':226 'api':4,21,41,72,103 'attach':112 'avail':207 'base':7,24,61,88 'base-network' 'behind':51 'broader':125 'caller':110 'categori':131 'challeng':80 'classif':146 'connect':187 'content':193 'convers':162 'cost':84 'data':9,26,132,136,234 'decim':101 'document':172,202,225 'ehr':216 'electron':220 'embed':147 'endpoint':14,31,50,65,128,165,214,239 'equal':94 'estim':157 'exampl':205 'exchang':152 'export':137 'extrem':174 'feed':151 'financ':11,28,148 'four':130 'function':236 'gas':156 'gate':3,20,44 'generat':163 'geocod':160 'header':117 'health':221 'indic':81 'infrastructure/utilities':159 'insight':138 'key':104 'learn':141 'limit':107 'list':69 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':140 'make':230 'marketplac':42 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':197 'page':182 'particular':238 'path':217 'pay-per-request API' 'payload':206 'payment':116,122 'per':53,96,170 'per-request':52 'per-request-billing' 'platform':5,22,126 'post':76 'post-endpoint' 'premium':71 'premium API access' 'price':150,167 'prompt':189 'proof':123 'protocol':40 'provid':240 'purpos':210 'quot':155 'rate':106,153 'record':222 'render':184 'report':135 'request':54,77,97,171 'request/response':200 'requir':109 'schema':201 'segment':218 'sentiment':142 'settl':56 'simpli':111 'site':229 'spars':175 'spec':198 'specif':64,209 'suggest':219 'summar':145 'text':144 'token':154 'unclear':232 'unit':89 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30 'valid':120,161 'varieti':48 'wallet':188 'web3':149 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"acb64061-7389-43af-8f97-1c6303930e9f","listingId":"ffd51bcd-2854-4cf4-92d7-ffd8e3c8fd9f","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/ehr/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.572Z"}],"sources":[{"listingId":"ffd51bcd-2854-4cf4-92d7-ffd8e3c8fd9f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.572Z","lastSeenAt":"2026-04-22T07:32:09.064Z"}],"details":{"listingId":"ffd51bcd-2854-4cf4-92d7-ffd8e3c8fd9f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/81"},{"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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing gated API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic access to premium data endpoints via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who need quick API access"],"notFor":["Users needing detailed API documentation or response schemas before integrating","Applications requiring high-volume, low-latency calls where per-request payment overhead matters","Anyone needing clarity on what the /ehr/81 endpoint actually returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.059Z"},"updatedAt":"2026-04-22T07:32:09.064Z"}}