{"id":"b28e4e36-c3c9-47db-9835-ed3264c5d100","shortId":"ukMELV","kind":"x402","title":"x402-gated EHR endpoint on Base, pay-per-request with USDC — no API keys required.","tagline":"x402-gated EHR endpoint on Base, pay-per-request with USDC — no API keys required.","description":"This endpoint at `/api/v1/ehr/23` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML, finance, infrastructure, and more. The specific resource at path `/ehr/23` is labeled \"Premium API Access\" in the x402 challenge but its exact data domain is unclear — the \"ehr\" path segment suggests Electronic Health Records, though the provider's landing page does not list this endpoint among its documented APIs. The endpoint is live and returns a valid x402 challenge.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the provider's advertised flat $0.02/request pricing across all endpoints. No API keys, rate limits, or subscriptions are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no description of what data this endpoint actually returns. The `outputSchema` in the challenge confirms it accepts HTTP POST but provides no field-level detail. Prospective users should treat this as an exploratory endpoint until the provider publishes proper documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post","ehr-data"],"categories":["data","health"],"synonyms":["electronic health records API","EHR endpoint","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","health data API","Base network API"],"warnings":["The /ehr/ path suggests Electronic Health Records — a regulated data category — but no compliance or data-source information is provided.","This specific endpoint (/api/v1/ehr/23) is not listed among the provider's documented APIs on the landing page.","No request or response schema is available; callers cannot know what fields to send or expect back.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/23","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific resource (/ehr/23) is not listed on the provider's own landing page. The purpose and data returned are essentially 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'/ehr/23':69 '/request':160 '0.02':149,159 '000':139 '0x8335':129 '20':138 '2913':130 '6':144 'Base network API' 'EHR endpoint' 'USDC micropayment API' 'accept':238 'access':74 'across':162 'actual':229 'addit':210 'advertis':157 'ai/ml':59 'among':105 'analyt':58 'api':15,32,55,73,108,166,196 'attach':176 'base':7,24,124,140 'base-network' 'call':54 'caller':174 'challeng':78,118,235 'collect':46 'confirm':236 'connect':205 'consist':152 'content':212 'contract':128 'data':57,82,226 'decim':145 'descript':223 'detail':247 'doc':195 'document':107,188,262 'domain':83 'ehr':4,21,87 'ehr-data' 'electron':91 'electronic health records API' 'endpoint':5,22,36,104,110,164,228,256 'equal':148 'exact':81,133 'exploratori':255 'extrem':190 'field':245 'field-level':244 'financ':60 'flat':158 'gate':3,20 'header':181 'health':92 'health data API' 'http':239 'http-post' 'infrastructur':61 'key':16,33,167 'label':71 'land':98 'level':246 'limit':169 'list':102 'live':112 'lowpaymentfee' 'lowpaymentfee.com':43 'maxamountrequir':136 'network':125 'no-api-key' 'openapi':216 'outputschema':232 'page':99,200 'part':40 'path':68,88 'pay':9,26,52 'pay-per-cal':51 'pay-per-call API' 'pay-per-request':8,25 'payment':119,180,186 'per':10,27,53,150 'platform':44 'post':240 'premium':72 'price':161,197 'prompt':207 'proof':187 'proper':261 'prospect':248 'protocol':50 'provid':96,155,193,242,259 'publish':260 'rate':168 'readm':199 'record':93 'render':202 'request':11,28,151 'request/response':219 'requir':17,34,173 'resourc':66 'return':114,230 'schema':220 'scheme':134 'segment':89 'settl':121 'simpli':175 'span':56 'spars':191 'spec':217 'specif':65 'subscript':171 'suggest':90 'technic':211 'though':94 'treat':251 'unclear':85 'unit':141 'usdc':13,30,127,147 'usdc-settlement' 'use':126 'user':249 'valid':116,184 'via':131 'wallet':206 'x':179 'x-payment':178 'x402':2,19,49,77,117,185 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"c68334cb-648b-4114-b1c8-25c85cfc2e66","listingId":"b28e4e36-c3c9-47db-9835-ed3264c5d100","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:09.891Z"}],"sources":[{"listingId":"b28e4e36-c3c9-47db-9835-ed3264c5d100","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:09.891Z","lastSeenAt":"2026-04-22T18:04:46.588Z"}],"details":{"listingId":"b28e4e36-c3c9-47db-9835-ed3264c5d100","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/23 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/23"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ehr/23"},{"claim":"Provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/ehr/23 endpoint is not listed among the provider's documented API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving health record data (EHR) on a per-request payment basis","Agent-driven data access without pre-registration or API keys","Programmatic micropayment-gated data retrieval on Base L2"],"bestFor":["Developers exploring x402-protocol pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC","Low-volume or experimental access to gated data endpoints"],"notFor":["Production healthcare applications requiring documented, compliant EHR APIs","High-volume bulk data retrieval where per-request pricing is inefficient","Users who need detailed API documentation and response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.845Z"},"updatedAt":"2026-04-22T18:04:46.588Z"}}