{"id":"72858990-d0f3-4022-b7cf-9e05adb9f1d9","shortId":"6dcayZ","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/67` is part of the lowpaymentfee.com platform, which offers 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/67` 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 records or a similar domain, but this cannot be confirmed from available material.\n\nThe endpoint is live and responds with a valid x402 challenge on POST. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing. No API keys are needed; access is granted by attaching a valid X-PAYMENT header. The platform advertises no rate limits and instant access.\n\nDocumentation is extremely sparse. The docs, API, pricing, 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 data this endpoint actually returns. Prospective users should be aware that the endpoint's purpose and response format are unclear from publicly available information.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["data","health"],"synonyms":["ehr api","electronic health records","premium api","lowpaymentfee","x402 api","pay-per-call api","base usdc api"],"warnings":["The exact purpose and data returned by /api/v1/ehr/67 are unknown — 'ehr' may imply health data, which could be a regulated category","No OpenAPI schema, request format, or response examples are available","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content","The 'ehr' path segment is not listed among the publicly advertised APIs on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/67","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/67","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/67 actually does, no request/response schema, and no examples. The crawled docs pages are empty. The listing is effectively a 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'/request':154 '0.02':144,153 '000':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '20':133 '6':141 'access':73,161,180 'actual':219 'advertis':174 'ai/ml':55 'amount':130 'analyt':54 'api':5,19,51,72,157,187 'attach':165 'avail':102,238 'awar':225 'base':8,22,122,135 'base usdc api' 'base-network' 'call':50 'cannot':98 'challeng':114 'collect':42 'confirm':100 'connect':196 'consist':147 'content':202 'contract':126 'crypto':58 'data':53,216 'decim':142 'descript':213 'doc':186 'document':80,181 'domain':95 'ehr':85 'ehr api' 'electron':89 'electronic health records' 'endpoint':6,20,30,105,218,228 'equal':143 'exact':76 'exampl':210 'extrem':183 'financ':57 'format':233 'function':77 'gate':3,17 'grant':163 'header':171 'health':90 'infer':56 'inform':239 'instant':179 'key':158 'limit':177 'list':67 'live':107 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':103 'maximum':129 'may':87 'need':160 'network':123 'no-api-key' 'offer':40 'openapi':206 'page':191 'part':34 'path':65 'pay':10,24,48 'pay-per-cal':47 'pay-per-call api' 'pay-per-request':9,23 'payment':117,170 'per':11,25,49,145 'platform':38,150,173 'post':116 'post-method' 'prefix':86 'premium':4,18,71 'premium api' 'price':155,188 'prompt':198 'prospect':221 'protocol':46 'public':237 'purpos':230 'rate':176 'readm':190 'record':91 'render':193 'request':12,26,146 'request/response':209 'requir':131 'respond':109 'respons':232 'return':220 'schema':207 'servic':61 'settl':119 'similar':94 'site':83 'span':52 'spars':184 'specif':63 'substant':201 'suggest':88 'titl':70 'unclear':235 'uniform':152 'unit':136 'usdc':14,28,125,138 'usdc-settlement' 'use':124 'user':222 'util':60 'valid':112,167 'wallet':197 'x':169 'x-payment':168 'x402':2,16,45,113 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"5dd48b19-487f-4d24-aa42-1db27d20cb4d","listingId":"72858990-d0f3-4022-b7cf-9e05adb9f1d9","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.099Z"}],"sources":[{"listingId":"72858990-d0f3-4022-b7cf-9e05adb9f1d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.099Z","lastSeenAt":"2026-04-22T16:32:33.004Z"}],"details":{"listingId":"72858990-d0f3-4022-b7cf-9e05adb9f1d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/67 \\\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/67"},{"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/67"}],"useCases":["Accessing premium data behind a per-request micropayment wall","Agent-driven API consumption without API key management","Programmatic pay-as-you-go data retrieval on Base network"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing well-documented API contracts before integration","Use cases requiring guaranteed SLAs or support","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.642Z"},"updatedAt":"2026-04-22T16:32:33.004Z"}}