{"id":"ae9e6839-6b88-4d8a-bcdf-1a73b92b65df","shortId":"C2YjLa","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 via the x402 protocol on the Base network. The specific endpoint `/api/v1/ehr/61` is listed under \"Premium API Access\" but its exact function is not documented on the provider's site. The broader platform offers endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nPayment is settled in USDC on Base. The x402 challenge for this endpoint advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform emphasizes simplicity: no API keys, no rate limits, no minimum commitments — just attach an x402 payment header and receive the response.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/ehr/61` endpoint specifically returns. The \"ehr\" path segment suggests electronic health records, but this is speculative and not confirmed by any available documentation.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","pay-per-call","json-response"],"categories":["data","api-gateway"],"synonyms":["lowpaymentfee","x402 api","pay per call api","micropayment api","USDC api access","Base network api","premium data api"],"warnings":["The specific endpoint /api/v1/ehr/61 has no documentation — its purpose, expected input, and output are unknown.","The 'ehr' path segment may refer to electronic health records, which could involve regulated health data (HIPAA, etc.) — use with caution.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content.","No OpenAPI schema or request/response examples are available anywhere on the site."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ehr/61","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/61","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. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/ehr/61 is entirely undocumented. The docs pages are empty. This is effectively a stub 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'/request':155 '0.02':10,28,142,154 '000':131 '20':130 '6':137 'Base network api' 'USDC api access' 'access':6,24,68 'across':156 'advertis':126,150 'ai/ml':89 'analysi':92 'analyt':88 'api':5,16,23,34,49,67,164,189 'attach':173 'avail':239 'base':8,26,57,119,132 'broader':82 'call':48 'challeng':122 'classif':94 'collect':43 'commit':171 'confirm':236 'connect':197 'consist':145 'content':203 'convers':111 'crypto':98 'data':87,99 'decim':138 'descript':214 'doc':187 'document':75,182,240 'ehr':223 'electron':227 'embed':95 'emphas':161 'endpoint':38,61,85,125,158,219 'estim':105 'exact':71 'exampl':211 'exchang':102 'extrem':184 'feed':101 'financ':96 'flat':151 'function':72 'gas':104 'gate':3,21,50 'generat':112 'geocod':109 'header':177 'health':228 'infer':90 'infrastructur':107 'json-response' 'key':17,35,165 'limit':168 'list':64 'lowpaymentfee' 'lowpaymentfee.com':40 'maxamountrequir':128 'micropayment api' 'minimum':170 'network':58 'no-api-key' 'offer':84 'openapi':207 'page':192 'path':224 'pay':9,27,46 'pay per call api' 'pay-per-cal':45 'pay-per-call' 'payment':113,176 'per':11,29,47,143 'per-request-billing' 'platform':83,160 'premium':4,22,66 'premium data api' 'price':100,152,188 'prompt':199 'protocol':54 'provid':41,78 'rate':103,167 'readm':191 'receiv':179 'record':229 'render':194 'request':12,30,144 'request/response':210 'requir':18,36 'respons':181 'return':221 'schema':208 'segment':225 'sentiment':91 'settl':115 'simplic':162 'sinc':134 'site':80,148 'span':86 'spars':185 'specif':60,220 'specul':233 'suggest':226 'summar':93 'translat':140 'unit':133 'usdc':14,32,117,135 'usdc-base' 'use':136 'util':108 'valid':110 'via':51 'wallet':198 'x402':2,20,53,121,175 'x402 api' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"8a337db0-1f88-477a-a5fc-0e8be52cfdb8","listingId":"ae9e6839-6b88-4d8a-bcdf-1a73b92b65df","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/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.210Z"}],"sources":[{"listingId":"ae9e6839-6b88-4d8a-bcdf-1a73b92b65df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ehr/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.210Z","lastSeenAt":"2026-04-22T04:02:22.778Z"}],"details":{"listingId":"ae9e6839-6b88-4d8a-bcdf-1a73b92b65df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ehr/61 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/ehr/61"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/ehr/61"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance, crypto, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic access to analytics, AI inference, finance data, or utility services at $0.02/call"],"bestFor":["Developers wanting zero-friction pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Anyone needing to understand exactly what /api/v1/ehr/61 returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.526Z"},"updatedAt":"2026-04-22T04:02:22.778Z"}}