{"id":"783928ea-11ed-4ba1-8a0b-0df4aefd6309","shortId":"cUyuKC","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/82` 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 resource at `/ehr/82` is labeled \"Premium API Access\" but its exact functionality is not documented — the path segment \"ehr\" 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 \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the platform's advertised flat $0.02/request pricing across all endpoints. No API keys are required; access is granted by including a valid `X-PAYMENT` header with each POST request. The platform advertises no rate limits and no minimum commitments.\n\nDocumentation 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 schema, no request/response examples, and no description of what data this specific endpoint returns. The `outputSchema` in the x402 challenge only confirms the HTTP POST method. Prospective users should treat this as an exploratory endpoint until the provider publishes proper documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["data","health"],"synonyms":["premium API","EHR API","electronic health records","lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API"],"warnings":["The exact purpose of /api/v1/ehr/82 is unknown — 'ehr' may imply health data, which could be a regulated category (HIPAA, etc.)","No documentation exists beyond the x402 challenge; docs/pricing/README pages are blank","No request body schema or response schema is available","The 'Premium API Access' label is generic and shared across the platform; it does not describe this specific endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/82","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/82","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 the /ehr/82 resource actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub 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'/ehr/82':64 '/request':148 '0.02':137,147 '000':127 '0x8335':117 '20':126 '2913':118 '6':132 'EHR API' 'USDC micropayment API' 'access':69,158 'across':150 'advertis':145,175 'ai/ml':53 'analyt':52 'api':5,19,49,68,154,190 'base':8,22,112,128 'base-network' 'call':48 'challeng':106,228 'collect':40 'commit':182 'confirm':230 'connect':198 'consist':140 'content':204 'contract':116 'crypto':56 'data':51,218 'decim':133 'descript':215 'doc':188 'document':76,183,249 'domain':92 'ehr':80 'electron':86 'electronic health records' 'endpoint':6,20,30,98,152,221,243 'equal':136 'exact':72,121 'exampl':212 'exploratori':242 'extrem':185 'financ':55 'flat':146 'function':73 'gate':3,17 'grant':160 'header':168 'health':87 'http':232 'includ':162 'infer':54 'key':155 'label':66 'limit':178 'live':100 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':124 'may':83 'method':234 'minimum':181 'network':113 'no-api-key' 'openapi':208 'outputschema':224 'page':193 'part':34 'path':78 'pay':10,24,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request':9,23 'payment':107,167 'per':11,25,47,138 'platform':38,143,174 'post':171,233 'post-method' 'premium':4,18,67 'premium API' 'price':149,189 'prompt':200 'proper':248 'prospect':235 'protocol':44 'provid':246 'publish':247 'rate':177 'readm':192 'record':88 'relat':84 'render':195 'request':12,26,139,172 'request/response':211 'requir':157 'resourc':62 'return':102,222 'schema':209 'scheme':122 'segment':79 'servic':59 'settl':109 'similar':91 'span':50 'spars':186 'specif':61,220 'substant':203 'suggest':81 'though':93 'treat':238 'unconfirm':96 'unit':129 'usdc':14,28,115,135 'usdc-settlement' 'use':114 'user':236 'util':58 'valid':104,164 'via':119 'wallet':199 'x':166 'x-payment':165 'x402':2,16,43,105,227 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"98b4e1f5-7088-46fe-a58b-ebbcb6ee12d4","listingId":"783928ea-11ed-4ba1-8a0b-0df4aefd6309","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.262Z"}],"sources":[{"listingId":"783928ea-11ed-4ba1-8a0b-0df4aefd6309","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.262Z","lastSeenAt":"2026-04-22T15:02:40.948Z"}],"details":{"listingId":"783928ea-11ed-4ba1-8a0b-0df4aefd6309","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/82 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform 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":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/82"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/82"}],"useCases":["Accessing premium data behind a per-request USDC paywall","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go data retrieval on Base network"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base per call","Users who want keyless, commitment-free API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or fiat-only payment options","Applications requiring guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.46Z"},"updatedAt":"2026-04-22T15:02:40.948Z"}}