{"id":"fb36615f-8de7-4ede-bef8-9ebfb5c9c930","shortId":"wSvSsg","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at `/api/v1/ehr/69` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific `/api/v1/ehr/69` path is listed under the title \"Premium API Access\" but its exact functionality is not documented on the site — the \"ehr\" prefix may suggest electronic health record data, but this is unconfirmed. The endpoint is live and returns a valid x402 challenge when called via POST.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`). The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints, no API keys, no rate limits, and instant access. The x402 scheme used is \"exact\" with a 300-second payment timeout.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no description of what data this endpoint actually returns. Without knowing the input parameters or output format, integration requires experimentation or contacting the provider directly.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["data","health"],"synonyms":["electronic health record API","EHR endpoint","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["The exact purpose of /api/v1/ehr/69 is unknown — 'ehr' may imply health data, which could involve regulated (HIPAA) content","All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no useful content","No request or response schema is available; integration requires blind experimentation","The 'ehr' path is not listed among the publicly advertised endpoints on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/69","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/69","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 /api/v1/ehr/69 actually does, what inputs it accepts, or what it returns. No OpenAPI spec, no examples, and all doc pages are empty. The listing is effectively a 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'/request':141 '0.02':133,140 '000':125 '0x8335':119 '20':124 '2913':120 '300':163 '6':130 'Base network API' 'EHR endpoint' 'USDC micropayment API' 'access':71,154 'across':143 'actual':205 'addit':187 'advertis':138 'ai/ml':53 'analyt':52 'api':5,19,49,70,147,173 'base':8,22,114,126 'base-network' 'call':12,26,106 'challeng':104 'collect':40 'connect':182 'contact':219 'content':188 'contract':118 'crypto':56 'data':51,90,202 'decim':131 'descript':199 'direct':222 'doc':172 'document':78,167 'ehr':83 'electron':87 'electronic health record API' 'endpoint':6,20,30,96,145,204 'equal':132 'exact':74,160 'experiment':217 'extrem':169 'financ':55 'format':214 'function':75 'gate':3,17 'health':88 'infer':54 'input':210 'instant':153 'integr':215 'key':148 'know':208 'limit':151 'list':65 'live':98 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':122 'may':85 'network':115 'no-api-key' 'openapi':192 'output':213 'page':177 'paramet':211 'part':34 'path':63 'pay':10,24,46 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':45 'payment':109,165 'per':11,25,47,134 'platform':38,137 'post':108 'post-endpoint' 'prefix':84 'premium':4,18,69 'price':142,174 'prompt':184 'protocol':44 'provid':221 'rate':150 'readm':176 'record':89 'render':179 'request':48,135 'request/response':195 'requir':216 'return':100,206 'schema':196 'scheme':157 'second':164 'servic':59 'settl':111 'site':81 'span':50 'spars':170 'spec':193 'specif':61 'suggest':86 'timeout':166 'titl':68 'unconfirm':94 'uniform':139 'unit':127 'usdc':14,28,117 'usdc-settlement' 'use':116,158 'util':58 'valid':102 'via':107 'wallet':183 'without':207 'x402':2,16,43,103,156 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"0a2ce517-7617-4c1e-ae5f-002724b5b82e","listingId":"fb36615f-8de7-4ede-bef8-9ebfb5c9c930","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.377Z"}],"sources":[{"listingId":"fb36615f-8de7-4ede-bef8-9ebfb5c9c930","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.377Z","lastSeenAt":"2026-04-22T15:02:41.114Z"}],"details":{"listingId":"fb36615f-8de7-4ede-bef8-9ebfb5c9c930","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/69 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/69"},{"claim":"The platform advertises $0.02/request pricing, no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/69"},{"claim":"Documentation, API, pricing, and README pages all render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data behind a per-request USDC paywall","Agent-driven API consumption without API key management","Programmatic pay-as-you-go data retrieval on Base"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users comfortable with USDC payments on Base L2"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring free or subscription-based access","Production systems that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.265Z"},"updatedAt":"2026-04-22T15:02:41.114Z"}}