{"id":"c16ab807-200c-4d81-ab26-c29b5a2ab159","shortId":"DqCVFd","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/47` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs settled in USDC on the Base network. The specific resource appears to be an Electronic Health Record (EHR) endpoint, though the provider's landing page does not list it among its publicly advertised API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). The endpoint is live and returns a valid x402 challenge with a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the platform's uniform pricing.\n\nThe platform advertises no API keys, no rate limits, and instant access. Payment is handled via the x402 protocol: callers include an `X-PAYMENT` header with a signed payment proof, and the server fulfills the request upon verification. The endpoint accepts POST requests and returns `application/json`. However, there is no documentation describing the request body schema, response format, or what data the EHR endpoint actually returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.\n\nBecause the endpoint path includes \"ehr\" (commonly associated with Electronic Health Records), this may involve health-related data. No details are available about what patient or health data is served, whether it is synthetic/sample data, or what input parameters are expected. Users should exercise caution and verify the nature of the data before integrating.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","ehr-data","json-response","no-api-key"],"categories":["health","data"],"synonyms":["electronic health record","EHR API","health data endpoint","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call health API"],"warnings":["The /api/v1/ehr/47 endpoint is not listed among the provider's publicly advertised APIs — its purpose and data content are unknown.","EHR commonly refers to Electronic Health Records, which may involve regulated health data (HIPAA, etc.). The nature of the data served is undocumented.","No request body schema or response schema is available — callers cannot know what to send or what to expect.","Documentation pages (/docs, /pricing, /api, /README) all render only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on request/response schemas, no description of what the EHR endpoint returns, and the endpoint is not listed on the provider's own landing page. The docs pages are empty. This is effectively a stub 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'0.02':9,26,122 '000':113 '20':112 '6':118 'EHR API' 'USDC micropayment API' 'accept':173 'access':143 'actual':197 'addit':214 'advertis':88,134 'ai':93 'among':85 'analyt':92 'api':15,32,55,89,136,203 'appear':66 'application/json':178 'associ':223 'avail':238 'base':7,24,61,114 'base-network' 'bodi':187 'caller':151 'categori':90 'caution':261 'challeng':107 'collect':46 'common':222 'connect':209 'consist':125 'content':215 'data':91,193,234,244,251,268 'decim':119 'describ':184 'detail':236 'doc':200 'document':183 'ehr':4,21,73,195,221 'ehr-data' 'electron':70,225 'electronic health record' 'endpoint':5,22,36,74,99,172,196,218 'equal':121 'exercis':260 'expect':257 'financ':95 'format':190 'fulfil':166 'gate':3,20 'handl':146 'header':157 'health':71,226,232,243 'health data endpoint' 'health-rel':231 'howev':179 'includ':152,220 'infrastructur':97 'input':254 'instant':142 'integr':270 'involv':230 'json-response' 'key':16,33,137 'land':79 'limit':140 'list':83 'live':101 'lowpaymentfee' 'lowpaymentfee.com':43 'maxamountrequir':110 'may':229 'ml':94 'natur':265 'network':62 'no-api-key' 'page':80,204 'paramet':255 'part':40 'path':219 'patient':241 'pay':8,25,52 'pay-per-call health API' 'pay-per-request':51 'payment':144,156,161 'per':10,27,53,123 'platform':44,128,133 'post':174 'price':131,201 'prompt':211 'proof':162 'protocol':50,150 'provid':77 'public':87 'rate':139 'record':72,227 'relat':233 'render':206 'request':11,28,54,124,168,175,186 'requir':17,34 'resourc':65 'respons':189 'return':103,177,198 'schema':188 'serv':246 'server':165 'settl':56 'sign':160 'specif':64 'synthetic/sample':250 'though':75 'uniform':130 'unit':115 'upon':169 'usdc':13,30,58,117 'usdc-settlement' 'user':258 'valid':105 'verif':170 'verifi':263 'via':147 'wallet':210 'web3':96 'whether':247 'x':155 'x-payment':154 'x402':2,19,49,106,149 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"62a308a9-7cc4-4fde-bda9-a38b2484c7e9","listingId":"c16ab807-200c-4d81-ab26-c29b5a2ab159","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.103Z"}],"sources":[{"listingId":"c16ab807-200c-4d81-ab26-c29b5a2ab159","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.103Z","lastSeenAt":"2026-04-22T16:32:33.015Z"}],"details":{"listingId":"c16ab807-200c-4d81-ab26-c29b5a2ab159","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/47 \\\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/47"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ehr/47"},{"claim":"The /api/v1/ehr/47 endpoint is not listed among the provider's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving electronic health record data via a single paid API call","Integrating EHR data into agent workflows without managing API keys","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents needing on-demand EHR data access without subscription commitments","Prototyping crypto-settled API payment flows on Base"],"notFor":["Production healthcare applications requiring documented, compliant EHR APIs","Users who need detailed API documentation or schema guarantees","High-volume use cases where per-request pricing may not be economical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.621Z"},"updatedAt":"2026-04-22T16:32:33.015Z"}}