{"id":"3923a0c6-7b1b-4583-91ff-bd1a4b3e58ac","shortId":"ruudrw","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/15` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs settled in USDC on the Base network. The specific resource at path `/ehr/15` is labeled \"Premium API Access\" but its exact data payload is unclear — the path prefix \"ehr\" suggests Electronic Health Records, and \"15\" may be a record or resource identifier. However, no documentation, schema, or sample response is available to confirm what data is returned.\n\nThe endpoint is live and responds with a valid x402 challenge (HTTP 402) requiring payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the platform's uniform pricing across all endpoints. Payment is made via the x402 \"exact\" scheme, with a 300-second timeout. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/crypto (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All share the same $0.02/request pricing and x402 payment flow. Documentation pages exist but returned only a \"Connect wallet\" prompt with no substantive content during crawl, so the actual request/response schemas for this and other endpoints remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","ehr-data"],"categories":["data","health"],"synonyms":["electronic health records API","EHR endpoint","health data API","x402 paid API","USDC micropayment API","lowpaymentfee","pay-per-call health data"],"warnings":["No documentation available — all doc pages returned only 'Connect wallet' with no content","The meaning of '/ehr/15' is unclear; 'EHR' may imply health data which could be a regulated category (HIPAA)","No request body schema or response schema is provided anywhere","No OpenAPI spec or AI plugin manifest found","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/15","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/15","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 what the /ehr/15 resource actually returns. No request or response schema, no examples, and all doc pages returned only 'Connect wallet'. The 'EHR' label is unverified and the endpoint is effectively a stub 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'/ehr/15':68 '/request':226 '0.02':9,26,147,225 '000':130 '0x8335':135 '15':90 '20':129 '2913':136 '300':170 '402':125 '6':142 'EHR endpoint' 'USDC micropayment API' 'access':73 'account':176 'across':157,201 'actual':250 'advertis':181 'ai/ml':203 'api':15,32,55,72,174 'attach':184 'avail':106 'base':7,24,61,131,138 'base-network' 'broader':196 'call':54 'caller':182 'challeng':123 'classif':206 'collect':46 'confirm':108 'connect':239 'consist':150 'content':245 'convers':220 'crawl':247 'data':77,110 'data/analytics':202 'decim':143 'document':100,232 'ehr':4,21,84 'ehr-data' 'electron':86 'electronic health records API' 'embed':207 'endpoint':5,22,36,114,159,200,257 'estim':214 'exact':76,166 'exchang':211 'exist':234 'feed':210 'finance/crypto':208 'flow':231 'gas':213 'gate':3,20 'geocod':218 'header':189 'health':87 'health data API' 'howev':98 'http':124 'identifi':97 'infrastructur':216 'key':16,33,175 'label':70 'limit':179 'live':116 'lowpaymentfee' 'lowpaymentfee.com':43,197 'made':162 'may':91 'network':62 'no-api-key' 'offer':199 'page':233 'part':40 'path':67,82 'pay':8,25,52 'pay-per-cal':51 'pay-per-call health data' 'pay-per-request' 'payload':78 'payment':127,160,188,193,230 'per':10,27,53,148 'platform':44,153,198 'prefix':83 'premium':71 'price':156,209,227 'prompt':241 'proof':194 'protocol':50 'rate':178,212 'record':88,94 'remain':258 'request':11,28,149 'request/response':251 'requir':17,34,126 'resourc':65,96 'respond':118 'respons':104 'return':112,236 'sampl':103 'schema':101,252 'scheme':167 'second':171 'sentiment':204 'settl':56 'share':222 'simpli':183 'sinc':139 'specif':64 'substant':244 'suggest':85 'summar':205 'timeout':172 'translat':145 'unclear':80 'uniform':155 'unit':132 'unknown':259 'usdc':13,30,58,134,140 'usdc-settlement' 'use':141 'util':217 'valid':121,192,219 'via':163 'wallet':240 'x':187 'x-payment':186 'x402':2,19,49,122,165,229 'x402 paid API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"69f1b881-add4-4a59-ba72-0928819a47f3","listingId":"3923a0c6-7b1b-4583-91ff-bd1a4b3e58ac","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T12:29:48.727Z"}],"sources":[{"listingId":"3923a0c6-7b1b-4583-91ff-bd1a4b3e58ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T12:29:48.727Z","lastSeenAt":"2026-04-22T19:32:38.660Z"}],"details":{"listingId":"3923a0c6-7b1b-4583-91ff-bd1a4b3e58ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/15 \\\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":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/15"},{"claim":"Platform advertises $0.02/request pricing 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/15"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving health record data (EHR) on a per-request payment basis","Agent-driven data access without pre-registration or API keys","Programmatic access to premium data behind crypto micropayments"],"bestFor":["Agents or services that need on-demand EHR data without account setup","Developers experimenting with x402 pay-per-call protocols","Low-volume consumers who prefer pay-as-you-go over subscriptions"],"notFor":["Production healthcare applications requiring HIPAA-compliant, well-documented 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":"2026-02-17T23:13:23.469Z"},"updatedAt":"2026-04-22T19:32:38.660Z"}}