{"id":"46c86184-3b68-486e-ac4e-636d888983fb","shortId":"TCDNd8","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/ehr/84` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific `/api/v1/ehr/84` path is listed under the title \"Premium API Access\" but its exact functionality is not documented on the site — the \"ehr\" path segment suggests it may relate to Electronic Health Records or a similar domain, though this is unconfirmed. 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 x402 \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the site's advertised flat $0.02/request pricing across all endpoints. No API keys are required; access is granted by attaching an X-PAYMENT header with a valid payment proof. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform advertises no rate limits, no minimums, and instant access. However, documentation 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 spec, no request/response schema, and no description of what data `/api/v1/ehr/84` actually returns. Without knowing the input parameters or output format, integrating this endpoint requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","health"],"synonyms":["electronic health records API","EHR API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["The exact purpose and data returned by /api/v1/ehr/84 are completely undocumented.","The 'ehr' path segment may relate to Electronic Health Records, which could involve regulated/sensitive data — exercise caution.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no content.","No request or response schema is available; integration requires trial and error."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/84","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/84","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 with clear pricing, but there is zero documentation on what /api/v1/ehr/84 actually does, what inputs it expects, or what it returns. No OpenAPI spec, no examples, and all doc pages are empty. The 'ehr' path is unexplained. This is effectively a stub 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'/request':154 '0.02':143,153 '000':133 '0x8335':122 '20':132 '2913':123 '6':138 'Base network API' 'EHR API' 'USDC micropayment API' 'accept':181 'access':71,164,199 'across':156 'actual':238 'advertis':151,191 'ai/ml':53 'analyt':52 'api':5,19,49,70,160,208 'application/json':186 'attach':168 'base':8,22,117,134 'base-network' 'broader':188 'call':48 'challeng':111 'collect':40 'connect':216 'consist':146 'contact':255 'content':222 'contract':121 'crypto':56 'data':51,236 'decim':139 'descript':233 'direct':254 'doc':206 'document':78,201 'domain':97 'ehr':83 'electron':91 'electronic health records API' 'endpoint':6,20,30,103,158,180,250 'equal':142 'exact':74,127 'experiment':252 'extrem':203 'financ':55 'flat':152 'format':247 'function':75 'gate':3,17 'grant':166 'header':173 'health':92 'howev':200 'infer':54 'input':243 'instant':198 'integr':248 'json-response' 'key':161 'know':241 'limit':194 'list':65 'live':105 'lowpaymentfee' 'lowpaymentfee.com':37,189 'maxamountrequir':130 'may':88 'minimum':196 'network':118 'no-api-key' 'openapi':226 'output':246 'page':211 'paramet':244 'part':34 'path':63,84 'pay':10,24,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request':9,23 'payment':112,172,177 'per':11,25,47,144 'platform':38,190 'post':182 'post-method' 'premium':4,18,69 'price':155,207 'prompt':218 'proof':178 'protocol':44 'provid':258 'rate':193 'readm':210 'record':93 'relat':89 'render':213 'request':12,26,145,183 'request/response':229 'requir':163,251 'return':107,185,239 'schema':230 'scheme':128 'segment':85 'servic':59 'settl':114 'similar':96 'site':81,149 'span':50 'spars':204 'spec':227 'specif':61 'substant':221 'suggest':86 'though':98 'titl':68 'unconfirm':101 'unit':135 'usdc':14,28,120,141 'usdc-settlement' 'use':119 'util':58 'valid':109,176 'via':124 'wallet':217 'without':240 'x':171 'x-payment':170 'x402':2,16,43,110,126 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"5f2e3398-b6b1-4965-9fbc-3e92412aeecc","listingId":"46c86184-3b68-486e-ac4e-636d888983fb","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.300Z"}],"sources":[{"listingId":"46c86184-3b68-486e-ac4e-636d888983fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.300Z","lastSeenAt":"2026-04-22T15:02:40.984Z"}],"details":{"listingId":"46c86184-3b68-486e-ac4e-636d888983fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/84 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/ehr/84"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data behind a per-request USDC paywall","Agent-driven API consumption without pre-registration or API keys","Programmatic retrieval of EHR-related data (if confirmed)"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring guaranteed SLAs or support contracts","Users without Base-network USDC wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.409Z"},"updatedAt":"2026-04-22T15:02:40.984Z"}}