{"id":"a85ee613-3570-4e5f-933a-f3118f9880c3","shortId":"jrDFDE","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/44` 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/44` path is labeled \"Premium API Access\" but its exact functionality is not documented on the provider's site — the \"ehr\" prefix may suggest electronic health records or a similar domain, but 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`). 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 is \"exact\" with a 300-second payment timeout.\n\nDocumentation is extremely thin — 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 this endpoint actually returns. The `outputSchema` in the challenge only specifies that the input method is HTTP POST. Without knowing what `/api/v1/ehr/44` returns, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["data","health"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","EHR API","premium data endpoint"],"warnings":["The /api/v1/ehr/44 path is not listed among the provider's publicly advertised endpoints — its purpose and response format are unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no substantive content.","The 'ehr' prefix may relate to electronic health records, which could involve regulated/sensitive data — exercise caution.","No request body schema or response schema is available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/44","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/44","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 /api/v1/ehr/44 actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The endpoint path is not listed among the provider's advertised APIs, making its purpose 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'/request':139 '0.02':131,138 '000':123 '0x8335':117 '20':122 '2913':118 '300':160 '6':128 'Base network API' 'EHR API' 'USDC micropayment API' 'access':68,152 'across':141 'actual':202 'advertis':136 'ai/ml':53 'analyt':52 'api':5,19,49,67,145,171 'base':8,22,112,124 'base-network' 'call':12,26 'caller':223 'challeng':106,208 'collect':40 'connect':179 'content':185 'contract':116 'crypto':56 'data':51,199 'decim':129 'descript':196 'doc':169 'document':75,164 'domain':92 'ehr':82 'electron':86 'endpoint':6,20,30,98,143,201 'equal':130 'exact':71,157 'exploratori':229 'extrem':166 'financ':55 'function':72 'gate':3,17 'health':87 'http':216 'http-post' 'infer':54 'input':213 'instant':151 'integr':230 'key':146 'know':219 'label':65 'limit':149 'live':100 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':120 'may':84 'method':214 'network':113 'no-api-key' 'openapi':189 'outputschema':205 'page':174 'part':34 'path':63 'pay':10,24,46 'pay-per-cal':9,23 'pay-per-call API' 'pay-per-request':45 'payment':107,162 'per':11,25,47,132 'platform':38,135 'post':217 'prefix':83 'premium':4,18,66 'premium data endpoint' 'price':140,170 'prompt':181 'protocol':44 'provid':78 'rate':148 'readm':173 'record':88 'render':176 'request':48,133 'request/response':192 'return':102,203,222 'schema':193 'scheme':155 'second':161 'servic':59 'settl':109 'similar':91 'site':80 'span':50 'spec':190 'specif':61 'specifi':210 'substant':184 'suggest':85 'thin':167 'timeout':163 'treat':225 'unconfirm':96 'uniform':137 'unit':125 'usdc':14,28,115 'usdc-settlement' 'use':114 'util':58 'valid':104 'wallet':180 'without':218 'x402':2,16,43,105,154 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"c76e4511-28e6-432e-b7bd-0d35f48febba","listingId":"a85ee613-3570-4e5f-933a-f3118f9880c3","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.151Z"}],"sources":[{"listingId":"a85ee613-3570-4e5f-933a-f3118f9880c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.151Z","lastSeenAt":"2026-04-22T16:32:33.042Z"}],"details":{"listingId":"a85ee613-3570-4e5f-933a-f3118f9880c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/44 \\\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 on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/ehr/44"},{"claim":"Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ehr/44"}],"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 L2"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing detailed documentation or guaranteed SLAs before integration","Use cases requiring free or OAuth-authenticated endpoints"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.637Z"},"updatedAt":"2026-04-22T16:32:33.042Z"}}