{"id":"7ec2c830-ecbd-4d81-9395-a3d87df21ee6","shortId":"qTvvgB","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/87` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, and utility services. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) via the x402 exact-payment scheme.\n\nThe x402 challenge indicates a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. The platform advertises uniform $0.02/request pricing across all endpoints, with no API keys, no rate limits, and no minimum commitments required. The endpoint is live and returns a proper 402 challenge.\n\nImportant caveat: the specific functionality behind `/api/v1/ehr/87` is not documented anywhere in the crawled material. The path segment \"ehr\" could suggest electronic health records, but this is speculative — the platform's landing page does not list this endpoint among its published API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). Without documentation or example request/response payloads, the actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["api","data"],"synonyms":["premium api","ehr api","lowpaymentfee","x402 api","pay-per-call api","micropayment api","base usdc api"],"warnings":["The endpoint /api/v1/ehr/87 is not listed among the provider's published APIs — its purpose and data contract are unknown.","The path segment 'ehr' may refer to electronic health records, which could involve regulated health data (HIPAA, etc.). Exercise caution.","No request or response schema is available; callers cannot know what to send or what to expect back.","Documentation pages (/docs, /api, /pricing, /README) all returned only a 'Connect wallet' prompt with no actual content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/87","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/87","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 with clear pricing, but there is zero documentation on what /api/v1/ehr/87 actually does. No request schema, no response schema, no examples, and the endpoint is not listed on the provider's own landing page. The functionality is entirely 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'/request':119 '0.02':111,118 '000':102 '0x8335':84 '20':101 '2913':85 '402':144 '6':107 'accept':68 'access':66 'across':121 'actual':203 'advertis':116 'ai':191 'ai/ml':53 'among':184 'amount':99 'analyt':52,190 'anywher':156 'api':5,19,49,65,126,187 'base':8,22,79,103 'base usdc api' 'base-network' 'behind':151 'call':48 'categori':188 'caveat':147 'challeng':95,145 'collect':40 'commit':134 'contract':83 'could':165 'crawl':159 'data':51,189,204 'decim':108 'document':155,197 'ehr':164 'ehr api' 'electron':167 'endpoint':6,20,30,61,123,137,183,208 'equal':110 'exact':90 'exact-pay':89 'exampl':199 'financ':55,193 'function':150 'gate':3,17 'health':168 'import':146 'indic':96 'infer':54 'infrastructur':195 'json':72 'json-response' 'key':127 'label':63 'land':177 'limit':130 'list':181 'live':139 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':160 'maximum':98 'micropayment api' 'minimum':133 'ml':192 'network':80 'page':178 'part':34 'path':162 'pay':10,24,46 'pay-per-cal':45 'pay-per-call api' 'pay-per-request':9,23 'payload':201 'payment':74,91 'per':11,25,47,112 'platform':38,115,175 'post':69 'post-method' 'premium':4,18,64 'premium api' 'price':120 'proper':143 'protocol':44 'publish':186 'rate':129 'record':169 'request':12,26,70,113 'request/response':200 'requir':135 'respons':73 'return':71,141,205 'scheme':92 'segment':163 'servic':58 'settl':76 'span':50 'specif':60,149 'specul':173 'suggest':166 'uniform':117 'unit':104 'unknown':210 'usdc':14,28,82,106 'usdc-settlement' 'use':81 'util':57 'via':86 'web3':194 'without':196 'x402':2,16,43,88,94 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"aa11a9e6-973f-4553-8493-50045f31f5d7","listingId":"7ec2c830-ecbd-4d81-9395-a3d87df21ee6","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.549Z"}],"sources":[{"listingId":"7ec2c830-ecbd-4d81-9395-a3d87df21ee6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.549Z","lastSeenAt":"2026-04-22T01:02:02.723Z"}],"details":{"listingId":"7ec2c830-ecbd-4d81-9395-a3d87df21ee6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/87 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/87"},{"claim":"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/87"}],"useCases":["Accessing premium data behind a per-request paywall without API key registration","Agent-driven programmatic data retrieval with automatic USDC micropayments","Integrating pay-as-you-go API calls into Web3-native workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or schema definitions before integration","Applications requiring free or subscription-based access models","Use cases where the specific data contract must be known upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.064Z"},"updatedAt":"2026-04-22T01:02:02.723Z"}}