{"id":"83ca7de2-103c-4442-8730-bd765cf2588e","shortId":"3ZDUgX","kind":"x402","title":"x402-gated EHR endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated EHR endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at `/api/v1/ehr/57` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, and utility services. The specific resource at path `/ehr/57` is labeled \"Premium API Access\" but its exact functionality is unclear — the \"ehr\" path segment suggests Electronic Health Records, though no documentation confirms what data or service is returned. The endpoint is live and responds with 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 equals $0.02 per request — consistent with the site-wide $0.02/request pricing advertised on the landing page. No API keys are needed; access is granted by including a valid `X-PAYMENT` header with a signed payment proof. The timeout window is 300 seconds.\n\nDocumentation 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 schema, no request/response examples, and no description of what the `/api/v1/ehr/57` endpoint actually returns. The `57` in the path may be a resource ID, but this is unconfirmed. Prospective users should exercise caution given the lack of documentation and the potentially sensitive nature of EHR-related data.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ehr-data"],"categories":["health","data"],"synonyms":["electronic health records API","EHR endpoint","x402 health data","pay-per-call EHR","lowpaymentfee EHR","Base USDC API","402 payment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The 'ehr' path segment suggests Electronic Health Records, which is a regulated data category; no compliance or data-source information is provided","No request body schema or response schema is documented; callers cannot know what to send or expect back","The '/57' path suffix may be a hardcoded resource ID; it is unclear if other IDs are valid","Potentially sensitive health data with no visible privacy policy or terms of service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/57","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/57","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 zero documentation on what the /ehr/57 resource actually returns. No OpenAPI schema, no request/response examples, and all doc pages render only 'Connect wallet'. The endpoint purpose is inferred solely from the URL 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'/ehr/57':72 '/request':151 '0.02':9,26,141,150 '000':133 '0x8335':123 '20':132 '2913':124 '300':183 '402 payment API' '57':226 '6':138 'Base USDC API' 'EHR endpoint' 'access':77,163 'actual':223 'advertis':153 'ai/ml':61 'analyt':60 'api':15,32,57,76,159,192 'base':7,24,118,134 'base-network' 'caution':243 'challeng':112 'collect':48 'confirm':95 'connect':200 'consist':144 'content':206 'contract':122 'data':59,97,258 'decim':139 'descript':217 'doc':190 'document':94,185,248 'ehr':4,21,85,256 'ehr-data' 'ehr-rel':255 'electron':89 'electronic health records API' 'endpoint':5,22,36,103,222 'equal':140 'exact':80,127 'exampl':214 'exercis':242 'extrem':187 'financ':63 'function':81 'gate':3,20 'given':244 'grant':165 'header':173 'health':90 'id':234 'includ':167 'infer':62 'key':16,33,160 'label':74 'lack':246 'land':156 'live':105 'lowpaymentfee EHR' 'lowpaymentfee.com':43 'maxamountrequir':130 'may':230 'natur':253 'need':162 'network':119 'no-api-key' 'offer':46 'openapi':210 'page':157,195 'part':40 'path':71,86,229 'pay':8,25,54 'pay-per-call EHR' 'pay-per-request':53 'payment':113,172,177 'per':10,27,55,142 'platform':44 'potenti':251 'premium':75 'price':152,191 'prompt':202 'proof':178 'prospect':239 'protocol':52 'readm':194 'record':91 'relat':257 'render':197 'request':11,28,56,143 'request/response':213 'requir':17,34 'resourc':69,233 'respond':107 'return':101,224 'schema':211 'scheme':128 'second':184 'segment':87 'sensit':252 'servic':66,99 'settl':115 'sign':176 'site':148 'site-wid':147 'span':58 'spars':188 'specif':68 'substant':205 'suggest':88 'though':92 'timeout':180 'unclear':83 'unconfirm':238 'unit':135 'usdc':13,30,121 'usdc-settlement' 'use':120 'user':240 'util':65 'valid':110,169 'via':125 'wallet':201 'wide':149 'window':181 'x':171 'x-payment':170 'x402':2,19,51,111 'x402 health data' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"55b47bb9-f854-48ca-b54b-40feea66694b","listingId":"83ca7de2-103c-4442-8730-bd765cf2588e","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:09.960Z"}],"sources":[{"listingId":"83ca7de2-103c-4442-8730-bd765cf2588e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:09.960Z","lastSeenAt":"2026-04-22T16:32:32.847Z"}],"details":{"listingId":"83ca7de2-103c-4442-8730-bd765cf2588e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/57 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/57"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ehr/57"}],"useCases":["Retrieving health record data (if confirmed as EHR) via a single pay-per-request call","Agent-driven data retrieval without pre-registration or API key management","Programmatic access to premium data behind x402 micropayment gating"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that need keyless, on-demand API access settled in USDC on Base","Low-volume or sporadic access patterns where $0.02/call is cost-effective"],"notFor":["Production healthcare applications requiring documented, compliant EHR APIs","High-volume bulk data retrieval where per-request pricing adds up","Users who need detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.842Z"},"updatedAt":"2026-04-22T16:32:32.847Z"}}