{"id":"9bd0e540-261f-4757-8b1c-5a6675f99091","shortId":"w3nKH4","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 premium API access to lab results data at the path `/api/v1/lab/results/40`. It accepts POST requests and returns JSON responses. Payment is handled inline via the x402 protocol on the Base network using USDC (contract 0x8335…2913), with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments. Payments settle on the Base L2 network.\n\nThe specific endpoint `/api/v1/lab/results/40` is labeled \"Premium API Access\" but lacks detailed documentation about what \"lab results\" data it returns, what input parameters it expects in the POST body, or what the response schema looks like. The probe confirms the endpoint is live (returns a valid 402 challenge), but without OpenAPI specs, example requests/responses, or further documentation, the exact functionality remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-api","lab-results","no-api-key","post-method"],"categories":["data","api-infrastructure"],"synonyms":["lab results API","x402 paid API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium data endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The meaning of 'lab results' and the parameter '40' in the path are undocumented","No example request or response bodies are available","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the term 'lab results' is unexplained. The listing is effectively a stub with confirmed 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'/request':17,34,139 '0.02':16,33,84,138 '000':88 '0x8335':77 '20':87 '2913':78 '402':206 '6':92 'Base network API' 'USDC pay-per-call' 'accept':55 'access':45,168 'advertis':98 'ai/ml':110 'analysi':112 'analyt':109 'api':44,106,144,167 'base':9,26,72,89,157 'base-network' 'bodi':188 'broader':95 'call':4,21,105 'challeng':207 'classif':114 'commit':152 'confirm':198 'contract':76 'convers':131 'cost':82 'data':49,108,177 'decim':93 'detail':171 'document':172,216 'embed':115 'enabl':38 'endpoint':7,24,39,134,162,200 'estim':125 'exact':218 'exampl':212 'exchang':120 'expect':184 'feed':119 'financ':116 'function':219 'gas':124 'generat':132 'geocod':129 'handl':64 'infrastructur':127 'inlin':65 'input':181 'json':60 'json-api' 'key':145 'l2':158 'lab':5,22,47,175 'lab results API' 'lab-results' 'label':165 'lack':170 'like':195 'limit':148 'live':202 'look':194 'lowpaymentfee' 'lowpaymentfee.com':41,96 'maximum':81 'micropayment API' 'minimum':151 'model':141 'network':73,159 'no-api-key' 'openapi':210 'paramet':182 'path':52 'pay':2,19,103 'pay-per-cal':1,18,102 'pay-per-call' 'payment':62,153 'per':3,20,85,104 'platform':97 'post':56,187 'post-method' 'premium':43,166 'premium data endpoint' 'price':118,140 'probe':197 'protocol':69 'provid':42 'quot':123 'rate':121,147 'remain':220 'request':57,86 'requests/responses':213 'respons':61,192 'result':6,23,48,176 'return':59,179,203 'schema':193 'sentiment':111 'settl':12,29,154 'share':135 'span':107 'spec':211 'specif':161 'suit':100 'summar':113 'token':122 'unclear':221 'unit':90 'usdc':14,31,75 'usdc-settlement' 'use':74 'util':128 'valid':130,205 'via':10,27,66 'web3':117 'without':209 'x402':11,28,37,68 'x402 paid API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"2300e37d-b298-4134-9e38-10aee8bb2b33","listingId":"9bd0e540-261f-4757-8b1c-5a6675f99091","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.042Z"}],"sources":[{"listingId":"9bd0e540-261f-4757-8b1c-5a6675f99091","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.042Z","lastSeenAt":"2026-04-23T05:02:13.454Z"}],"details":{"listingId":"9bd0e540-261f-4757-8b1c-5a6675f99091","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/40 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/40"},{"claim":"All endpoints on the platform are priced at $0.02 per request 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/lab/results/40"}],"useCases":["Retrieving lab results data with per-call USDC micropayments","Integrating pay-as-you-go data access into agent workflows without API key management","Programmatic access to premium data behind x402 payment gates"],"bestFor":["Agents or applications that need keyless, pay-per-call data access","Developers experimenting with x402 micropayment-gated APIs","Use cases requiring low-friction, no-subscription data retrieval on Base"],"notFor":["Users who need detailed documentation or well-defined schemas before integration","High-volume batch processing where per-call pricing may add up","Anyone needing non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.771Z"},"updatedAt":"2026-04-23T05:02:13.454Z"}}