{"id":"2c80b7dc-b36f-4d14-ac5c-d39af20c9890","shortId":"HsccUK","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/59` 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/59` 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.\n\nThe endpoint is live and responds with a valid x402 payment challenge on POST. It accepts payment in USDC on the Base network at a maximum cost of 20,000 base units (0.02 USDC, i.e., two cents per request). The platform advertises a uniform $0.02/request pricing model across all its endpoints, with no API keys, no rate limits, and no minimum commitments required. Payment is settled on-chain via the x402 \"exact\" scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The input schema indicates it accepts HTTP POST requests and is marked as discoverable, but the expected request body and response format are unknown. Users should be aware that without documentation, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","json-response"],"categories":["data","health"],"synonyms":["premium API","EHR API","electronic health records","lowpaymentfee","x402 API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact purpose of /api/v1/ehr/59 is unknown — 'ehr' may imply health data, which could involve regulated categories (HIPAA, etc.)","No documentation, OpenAPI spec, or usage examples are available from the provider","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The endpoint path does not appear in the provider's own listed API catalog on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/59","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/59","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/59 actually does, no request/response schema, and no examples. The docs pages are empty. This is effectively a stub 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'/request':147 '0.02':134,146 '000':131 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':179 '20':130 'Base network API' 'EHR API' 'USDC micropayment API' 'accept':117,221 'access':71 'across':150 'addit':200 'address':178 'advertis':143 'ai/ml':53 'analyt':52 'api':5,19,49,70,156,186 'avail':215 'awar':243 'base':8,22,123,132 'base-network' 'bodi':234 'cent':138 'chain':171 'challeng':113 'collect':40 'commit':164 'connect':195 'contact':251 'content':202 'cost':128 'crypto':56 'data':51 'discover':229 'doc':185 'document':78,180,246 'domain':97 'ehr':83 'electron':91 'electronic health records' 'endpoint':6,20,30,103,153 'exact':74,175 'exampl':214 'expect':232 'experiment':249 'extrem':182 'financ':55 'format':237 'function':75 'gate':3,17 'health':92 'http':222 'http-post' 'i.e':136 'indic':219 'infer':54 'input':217 'integr':247 'json-response' 'key':157 'limit':160 'list':65 'live':105 'lowpaymentfee' 'lowpaymentfee.com':37 'mark':227 'maximum':127 'may':88 'minimum':163 'model':149 'network':124 'on-chain':169 'openapi':206 'page':190 'part':34 'path':63,84 'pay':10,24,46 'pay-per-call API' 'pay-per-request':9,23,45 'payment':112,118,166 'per':11,25,47,139 'platform':38,142 'post':115,223 'premium':4,18,69 'premium API' 'price':148,187 'prompt':197 'protocol':44 'provid':253 'rate':159 'readm':189 'record':93 'relat':89 'render':192 'request':12,26,48,140,224,233 'request/response':209 'requir':165,248 'respond':107 'respons':236 'schema':210,218 'scheme':176 'segment':85 'servic':59 'settl':168 'similar':96 'site':81 'span':50 'spars':183 'spec':207 'specif':61 'suggest':86 'technic':201 'though':98 'titl':68 'two':137 'unconfirm':101 'uniform':145 'unit':133 'unknown':239 'usag':213 'usdc':14,28,120,135 'usdc-settlement' 'user':240 'util':58 'valid':110 'via':172 'wallet':196 'without':245 'x402':2,16,43,111,174 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"788d5a56-daa5-4a63-af79-21d772edbc51","listingId":"2c80b7dc-b36f-4d14-ac5c-d39af20c9890","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:09.992Z"}],"sources":[{"listingId":"2c80b7dc-b36f-4d14-ac5c-d39af20c9890","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:09.992Z","lastSeenAt":"2026-04-22T16:32:32.881Z"}],"details":{"listingId":"2c80b7dc-b36f-4d14-ac5c-d39af20c9890","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/59 \\\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/59"},{"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 on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/ehr/59"},{"claim":"Documentation pages render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium data endpoint with per-request USDC micropayments","Integrating pay-as-you-go API calls without managing API keys or subscriptions","Agent-driven programmatic access to gated resources via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users comfortable with on-chain USDC micropayments"],"notFor":["Anyone needing detailed API documentation or guaranteed SLAs before integrating","Use cases requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.776Z"},"updatedAt":"2026-04-22T16:32:32.881Z"}}