{"id":"9129ff33-d45e-40b3-8b9e-98275feaa3c8","shortId":"rarKd9","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/76` 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/76` path is listed as \"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 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 a flat $0.02/request pricing model across all endpoints with no API keys, no rate limits, and no minimum commitments. The x402 scheme used is \"exact\" with a 300-second payment timeout.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 returns or what input it expects. The `outputSchema` in the x402 challenge indicates it accepts HTTP POST requests and is discoverable, but provides no field-level detail. Prospective users should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","http-post","no-api-key"],"categories":["data","health"],"synonyms":["premium API","EHR API","electronic health records","x402 endpoint","pay-per-call API","lowpaymentfee","USDC API","Base network API"],"warnings":["The exact purpose and data returned by /api/v1/ehr/76 are completely undocumented.","The 'ehr' path segment may imply health data, which could fall under regulated categories (HIPAA, etc.) — exercise caution.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request or response schema is available; integration requires trial-and-error or contacting the provider."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/76","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/76","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/76 actually does, what inputs it expects, or what it returns. No OpenAPI spec, no examples, and the docs pages are empty. The listing is effectively a 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'/request':141 '0.02':132,140 '000':124 '0x8335':118 '20':123 '2913':119 '300':166 '6':129 'Base network API' 'EHR API' 'USDC API' 'accept':222 'access':71 'across':144 'actual':245 'addit':190 'advertis':137 'ai/ml':55 'analyt':54 'api':5,19,51,70,149,177 'awar':240 'base':8,22,113,125 'base-network' 'behavior':246 'call':50 'challeng':107,219 'collect':42 'commit':157 'connect':185 'content':191 'contract':117 'crypto':58 'data':53,205 'decim':130 'descript':202 'detail':235 'discover':228 'doc':175 'document':78,170,243 'domain':93 'ehr':83 'electron':87 'electronic health records' 'endpoint':6,20,30,99,146,207,249 'equal':131 'exact':74,163 'expect':213 'extrem':172 'field':233 'field-level':232 'financ':57 'flat':139 'function':75 'gate':3,17 'health':88 'http':223 'http-post' 'indic':220 'infer':56 'input':211 'key':150 'level':234 'limit':153 'list':67 'live':101 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':121 'may':85 'minimum':156 'model':143 'network':114 'no-api-key' 'offer':40 'openapi':195 'outputschema':215 'page':180 'part':34 'path':65 'pay':10,24,48 'pay-per-cal':47 'pay-per-call API' 'pay-per-request':9,23 'payment':108,168 'per':11,25,49,133 'platform':38,136 'post':224 'prefix':84 'premium':4,18,69 'premium API' 'price':142,176 'prompt':187 'prospect':236 'protocol':46 'provid':230 'rate':152 'readm':179 'record':89 'render':182 'request':12,26,134,225 'request/response':198 'return':103,208 'schema':199 'scheme':160 'second':167 'servic':61 'settl':110 'similar':92 'site':81 'span':52 'spars':173 'spec':196 'specif':63 'suggest':86 'timeout':169 'unconfirm':97 'unit':126 'unknown':251 'usdc':14,28,116 'usdc-settlement' 'use':115,161 'user':237 'util':60 'valid':105 'wallet':186 'without':242 'x402':2,16,45,106,159,218 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"703d6df5-1ebf-4be1-9180-e6297af64374","listingId":"9129ff33-d45e-40b3-8b9e-98275feaa3c8","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.324Z"}],"sources":[{"listingId":"9129ff33-d45e-40b3-8b9e-98275feaa3c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.324Z","lastSeenAt":"2026-04-22T15:02:41.044Z"}],"details":{"listingId":"9129ff33-d45e-40b3-8b9e-98275feaa3c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/76"},{"claim":"The platform advertises $0.02/request pricing with 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/76"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no documentation content","source_url":"https://lowpaymentfee.com/docs"}],"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"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","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 a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.375Z"},"updatedAt":"2026-04-22T15:02:41.044Z"}}