{"id":"7b9f8166-3bb4-437d-9ebc-2355778f0089","shortId":"2jqRUG","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a collection of pay-per-call APIs gated by the x402 protocol on the Base network. The specific endpoint `/api/v1/ehr/77` is listed under \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality of `/api/v1/ehr/77` is unclear. The path segment \"ehr\" could suggest Electronic Health Records, but there is no documentation confirming what this particular endpoint returns. The crawled docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-settlement","base-network","post-method","no-api-key","pay-per-use"],"categories":["data","api-gateway"],"synonyms":["premium API","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/ehr/77 is unknown — 'ehr' may refer to Electronic Health Records, which could involve regulated health data, but this is unconfirmed.","No OpenAPI schema, request body schema, or response schema is available.","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no substantive content.","The endpoint is not listed among the publicly advertised APIs on the landing page, raising questions about its intended use."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/77","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/ehr/77 is entirely unclear. The crawled pages beyond the landing page all returned only 'Connect wallet' with no useful 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'0.02':10,28,100,150 '000':91 '0x8335':78 '20':90 '2913':79 '402 payment endpoint' '6':96 'Base network API' 'USDC micropayment API' 'accept':70 'access':6,24,68 'across':109 'actual':221 'addit':209 'advertis':85 'ai':119 'amount':88 'analysi':123 'analyt':113 'api':5,16,23,34,49,67,155,196 'base':8,26,57,81,92 'base-network' 'behavior':222 'broader':104 'call':48 'categori':111 'challeng':84 'classif':126 'collect':43 'commit':163 'confirm':186 'connect':204 'content':210 'contract':77 'convers':143 'could':176 'crawl':193 'data':112,116 'decim':97 'detail':218 'doc':194 'document':185,219 'ehr':175 'electron':178 'embed':127 'endpoint':38,61,108,146,190,225 'equal':99 'estim':137 'exampl':216 'exchang':132 'export':117 'feed':131 'financ':128 'function':167 'gas':136 'gate':3,21,50 'generat':144 'geocod':141 'health':179 'howev':164 'infrastructur':139 'insight':118 'key':17,35,156 'learn':121 'limit':159 'list':64 'lowpaymentfee' 'lowpaymentfee.com':40,105 'machin':120 'maximum':87 'metric':114 'minimum':162 'network':58 'no-api-key' 'offer':107 'openapi':213 'page':199 'particular':189 'path':173 'pay':9,27,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-use' 'payment':74 'per':11,29,47,101,151 'per-call-billing' 'platform':106 'post':71 'post-method' 'premium':4,22,66 'premium API' 'price':130,148,195 'prompt':206 'protocol':54 'provid':41 'quot':135 'rate':133,158 'readm':198 'record':180 'remain':226 'render':201 'report':115 'request':12,30,72,102,152 'request/response':215 'requir':18,36 'return':191 'schema':214 'segment':174 'sentiment':122 'settl':73 'sever':110 'specif':60,166 'suggest':177 'summar':125 'text':124 'token':134 'unclear':171 'unit':93 'unknown':227 'usdc':14,32,76,95 'usdc-settlement' 'util':140 'valid':142 'wallet':205 'web3':129 'without':211 'x402':2,20,53,83 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"33182fa9-170c-4eea-9b2c-0ccbf7e306db","listingId":"7b9f8166-3bb4-437d-9ebc-2355778f0089","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.652Z"}],"sources":[{"listingId":"7b9f8166-3bb4-437d-9ebc-2355778f0089","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.652Z","lastSeenAt":"2026-04-22T04:02:23.258Z"}],"details":{"listingId":"7b9f8166-3bb4-437d-9ebc-2355778f0089","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/77"},{"claim":"All endpoints on lowpaymentfee.com are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/77"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-request access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based access without per-call costs","Anyone needing clarity on what the /ehr/77 endpoint specifically returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.942Z"},"updatedAt":"2026-04-22T04:02:23.258Z"}}