{"id":"4a23e32d-a4e4-4430-a791-b5cd26b24ff6","shortId":"HZJAny","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call lab results endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides access to a specific lab results resource (`/api/v1/lab/results/73`) via HTTP POST, paid per-request in USDC on the Base network. The endpoint returns a 402 challenge requiring an X-PAYMENT header with an exact payment of 20,000 base units of USDC (0.02 USD) per call. No API keys or rate limits are required — access is gated purely by micropayment.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (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 listed at $0.02 per request and settle on the Base network using USDC.\n\nThe specific endpoint being listed here (`/api/v1/lab/results/73`) is not explicitly described on the landing page among the advertised API categories, so its exact response payload is unclear. The x402 challenge confirms it is live, accepts POST, and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-call-micropayment","json-response","no-api-key","lab-results"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","pay-per-call API","x402 micropayment endpoint","USDC API access","Base network API","lowpaymentfee"],"warnings":["The specific endpoint /api/v1/lab/results/73 is not listed among the advertised APIs on the landing page — its purpose and response schema are unknown.","No OpenAPI spec, README, or detailed docs were found; /pricing and /README pages returned only a 'Connect wallet' prompt.","Response payload structure is entirely unknown — no outputSchema fields beyond the HTTP method were provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/73","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/lab/results/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation for this specific resource, no example request/response payloads, and the purpose of '/api/v1/lab/results/73' is not explained anywhere in the crawled material. Effectively a stub 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'pay':2,19,114 'pay-per-cal':1,18,113 'pay-per-call API' 'payload':191 'payment':74,79 'per':3,20,56,89,115,157 'per-call-micropayment' 'per-request':55 'platform':108 'post':53,202 'price':136 'provid':42 'pure':102 'quot':141 'rate':95,139 'report':122 'request':57,158 'requir':70,98 'resourc':49 'respons':190,213 'result':6,23,48 'return':66,204 'schema':208 'sentiment':128 'settl':12,29,160 'span':118 'specif':46,168 'suit':111 'summar':131 'text':130 'token':140 'unclear':193 'unit':84 'usd':88 'usdc':14,31,59,86,166 'usdc-settlement' 'use':165 'util':146 'valid':148 'via':10,27,51 'web3':135 'x':73 'x-payment':72 'x402':11,28,37,195 'x402 micropayment endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"9d588821-0c41-4277-84d4-f0b596e61acb","listingId":"4a23e32d-a4e4-4430-a791-b5cd26b24ff6","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/lab/results/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.567Z"}],"sources":[{"listingId":"4a23e32d-a4e4-4430-a791-b5cd26b24ff6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.567Z","lastSeenAt":"2026-04-23T02:02:21.297Z"}],"details":{"listingId":"4a23e32d-a4e4-4430-a791-b5cd26b24ff6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/73 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/73"},{"claim":"All listed APIs 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":"The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving lab result data for resource ID 73 via a single micropayment","Programmatic access to paid data endpoints without managing API keys or subscriptions","Agent-driven data retrieval where per-call USDC payment replaces traditional auth"],"bestFor":["Agents or scripts that need one-off paid data access without signup","Developers exploring x402 micropayment patterns on Base","Use cases where pay-per-request is preferable to subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-call pricing would be cost-inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.991Z"},"updatedAt":"2026-04-23T02:02:21.297Z"}}