{"id":"d75f11f5-e4b1-42c5-97c6-ce581339bc79","shortId":"Qk7Wet","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource path `/api/v1/lab/results/48` suggests a lab-results or experimental-data endpoint, though the exact data returned is not documented beyond the generic \"Premium API Access\" label. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (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, require no API keys or rate limits, and are accessed via x402 payment headers on the Base network.\n\nThe specific `/api/v1/lab/results/48` endpoint is live and returns a proper 402 challenge when called without payment. However, there is no dedicated documentation, OpenAPI schema, or example response for this particular resource. The output MIME type is `application/json` and the HTTP method is POST. Without further documentation it is unclear what payload (if any) the POST body should contain, or what shape the JSON response takes.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","lab-results","no-api-key","no-rate-limit"],"categories":["data","api-marketplace"],"synonyms":["lab results API","premium data endpoint","x402 API","pay-per-request API","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The meaning of '/api/v1/lab/results/48' is undocumented — unclear what data is returned","No example request body or response body 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/48","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/48","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 402 challenge, but there is no OpenAPI schema, no documented request/response format, and no explanation of what 'lab/results/48' actually returns. The listing is essentially a stub with pricing info 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'/request':13,28,146 '0.02':12,27,91,145 '000':95 '0x8335':84 '20':94 '2913':85 '402':176 '6':99 'Base USDC API' 'access':7,22,38,72,157 'advertis':105 'ai/ml':117 'analysi':120 'analyt':116 'api':6,21,37,71,113,150 'application/json':202 'base':9,24,79,96,164 'beyond':67 'bodi':221 'broader':102 'call':4,19,112,179 'challeng':177 'classif':122 'contain':223 'contract':83 'convers':138 'cost':89 'data':57,62,115 'decim':100 'dedic':186 'document':66,187,211 'embed':123 'endpoint':32,58,141,169 'estim':132 'exact':61 'exampl':191 'exchang':127 'experiment':56 'experimental-data':55 'feed':126 'finance/web3':124 'gas':131 'generat':139 'generic':69 'geocod':136 'header':161 'howev':182 'http':205 'infer':118 'infrastructur':134 'json':228 'json-api' 'key':151 'lab':52 'lab results API' 'lab-result':51 'lab-results' 'label':73 'limit':154 'live':171 'lowpaymentfee' 'lowpaymentfee.com':34,103 'maximum':88 'method':206 'micropayment API' 'mime':199 'network':80,165 'no-api-key' 'no-rate-limit' 'openapi':188 'output':198 'particular':195 'path':47 'pay':2,17,110 'pay-per-cal':1,16,109 'pay-per-call' 'pay-per-request API' 'payload':216 'payment':42,74,160,181 'per':3,18,92,111 'platform':104 'post':208,220 'premium':5,20,36,70 'premium data endpoint' 'price':125,147 'proper':175 'protocol':43 'provid':35 'quot':130 'rate':128,153 'request':93 'requir':148 'resourc':46,196 'respons':192,229 'result':53 'return':63,173 'schema':189 'sentiment':119 'settl':76 'shape':226 'share':142 'span':114 'specif':45,167 'suggest':49 'suit':107 'summar':121 'take':230 'though':59 'token':129 'type':200 'unclear':214 'unit':97 'usdc':15,30,82 'usdc-base' 'use':81 'util':135 'valid':137 'via':10,25,39,158 'without':180,209 'x402':11,26,41,159 'x402 API' 'x402-payment'","prices":[{"id":"00c13efb-4c6a-4118-919d-20108f545fd8","listingId":"d75f11f5-e4b1-42c5-97c6-ce581339bc79","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.739Z"}],"sources":[{"listingId":"d75f11f5-e4b1-42c5-97c6-ce581339bc79","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.739Z","lastSeenAt":"2026-04-22T01:02:20.614Z"}],"details":{"listingId":"d75f11f5-e4b1-42c5-97c6-ce581339bc79","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/48 \\\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":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/lab/results/48"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/lab/results/48"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching lab or experimental result data behind a micropayment wall","Programmatic access to premium data without managing API keys or subscriptions","Agent-driven data retrieval with automatic per-call USDC payment on Base"],"bestFor":["Developers wanting zero-friction pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.651Z"},"updatedAt":"2026-04-22T01:02:20.614Z"}}