{"id":"794a79e4-9c2a-4e55-940b-256a997210f9","shortId":"SLrQ8z","kind":"x402","title":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call lab results endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/lab/results/57` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe specific resource `/api/v1/lab/results/57` is listed under the title \"Premium API Access\" and returns `application/json` responses via HTTP POST. The x402 challenge confirms the endpoint is live, accepting exact-scheme payments of up to 20,000 base units of USDC (0.02 USD) to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. However, the exact nature of the \"lab results\" data returned by this particular endpoint is not documented in the crawled material — the path suggests it retrieves a specific result set identified by ID 57, but no schema or sample response is available.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point. Without further documentation or an OpenAPI spec, the precise request body format and response schema for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key","no-rate-limit"],"categories":["data","api-marketplace"],"synonyms":["lab results API","premium API access","lowpaymentfee","x402 data endpoint","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The meaning of 'lab results' and the data returned are completely undocumented","No example request body or response body available","The /api, /pricing, and /README pages returned no useful content (just 'Connect wallet')","The specific resource ID '57' is hardcoded in the path with no explanation of what it represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/57","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/57","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 spec, no documentation of request/response schemas, and the purpose of 'lab results/57' is entirely undocumented. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'0.02':12,28,79,134,209 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '20':128 '57':174 'Base network API' 'USDC micropayment API' 'accept':120 'access':104 'address':137 'advertis':186 'ai/ml':57 'analysi':190 'analyt':56 'api':53,84,103 'application/json':107 'avail':182 'base':9,25,76,130,140 'bodi':222 'broad':46 'broader':184 'call':4,20 'challeng':114 'classif':193 'commit':92 'confirm':115 'convers':201 'crawl':160 'data':55,60,149,203 'document':157,214 'embed':194 'endpoint':7,23,34,65,117,154,187,229 'exact':122,143 'exact-schem':121 'exchang':197 'export':204 'feed':196 'finance/web3':59 'format':223 'geocod':199 'howev':141 'http':110 'http-post' 'id':173 'identifi':171 'infer':58 'infrastructur':62 'json-response' 'key':85 'lab':5,21,147 'lab results API' 'limit':88 'list':98 'live':119 'lowpaymentfee' 'lowpaymentfee.com':41 'materi':161 'minimum':91 'natur':144 'network':77 'no-api-key' 'no-rate-limit' 'offer':44 'openapi':217 'part':38 'particular':153 'path':163 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':69,124 'per':3,13,19,29,51,80 'platform':42,185 'point':211 'post':111 'precis':220 'premium':102 'premium API access' 'price':195,210 'protocol':70 'rate':87,198 'remain':230 'request':14,30,52,81,221 'resourc':95 'respons':108,180,225 'result':6,22,148,169 'retriev':166 'return':106,150 'sampl':179 'schema':177,226 'scheme':123 'sentiment':189 'set':170 'settl':71 'span':54 'spec':218 'specif':94,168 'suggest':164 'suit':47 'summar':192 'text':191 'titl':101 'unit':131 'unknown':231 'usd':135 'usdc':16,32,73,133 'usdc-base' 'use':66 'util':63 'valid':200 'via':10,26,109 'without':212 'x402':11,27,68,113 'x402 data endpoint' 'x402-payment'","prices":[{"id":"b10305de-9d64-4493-b3bc-244a53094d36","listingId":"794a79e4-9c2a-4e55-940b-256a997210f9","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.417Z"}],"sources":[{"listingId":"794a79e4-9c2a-4e55-940b-256a997210f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.417Z","lastSeenAt":"2026-04-22T01:02:20.158Z"}],"details":{"listingId":"794a79e4-9c2a-4e55-940b-256a997210f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/57 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/57"},{"claim":"All endpoints 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 offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/57"}],"useCases":["Retrieving lab result data on-demand with per-call USDC micropayments","Integrating pay-as-you-go data access into agent workflows without API key management","Programmatic access to result sets via x402-compatible clients"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call data access","x402-compatible wallets and clients on Base","Low-volume or sporadic access patterns where subscriptions are overkill"],"notFor":["Users needing detailed documentation or guaranteed response schemas before integration","High-volume bulk data retrieval where per-call pricing becomes expensive","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.137Z"},"updatedAt":"2026-04-22T01:02:20.158Z"}}