{"id":"225f35e0-41d1-48b1-a8e7-3587e7ea87b8","shortId":"xMVMP5","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 pay-per-request API access gated by the x402 payment protocol. The specific resource `/api/v1/lab/results/74` is listed under \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/lab/results/74` appears to be a lab/results resource, but its exact functionality is not documented on the site's landing page — it is not listed among the publicly advertised API categories. The endpoint is live and returns a valid x402 challenge, but without further documentation or example responses, the precise data returned is unknown. Callers should be prepared for an `application/json` response as indicated by the challenge's mimeType field.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["data","api-infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lab results API"],"warnings":["The endpoint /api/v1/lab/results/74 is not listed among the publicly advertised APIs on the landing page — its purpose and response format are unknown.","No OpenAPI spec, example payloads, or detailed documentation 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/74","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/74","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 challenge, but the specific resource /api/v1/lab/results/74 is not documented anywhere on the site. There is no OpenAPI spec, no example request/response, and no description of what 'lab results 74' actually returns. The listing is effectively a stub with confirmed 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'no-rate-limit' 'offer':95 'page':177 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,63 'per':3,18,38,89,141 'platform':94 'post':60 'precis':206 'premium':5,20,55 'prepar':214 'price':119,138 'protocol':47 'provid':35 'public':184 'quot':124 'rate':122,148 'report':104 'request':39,61,90,142 'requir':154 'resourc':50,164 'respons':204,218 'return':193,208 'sentiment':111 'settl':62 'site':174 'span':100 'specif':49,156 'suit':97 'summar':114 'text':113 'token':123 'uniform':137 'unit':81 'unknown':210 'usdc':15,30,65,83 'usdc-base-network' 'util':129 'valid':131,195 'via':10,25 'web3':118 'without':199 'x402':11,26,45,71,196 'x402 API' 'x402-payment'","prices":[{"id":"85e1e33f-8a3a-4dbc-850b-938aadcdc261","listingId":"225f35e0-41d1-48b1-a8e7-3587e7ea87b8","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.672Z"}],"sources":[{"listingId":"225f35e0-41d1-48b1-a8e7-3587e7ea87b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.672Z","lastSeenAt":"2026-04-23T00:32:57.880Z"}],"details":{"listingId":"225f35e0-41d1-48b1-a8e7-3587e7ea87b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/74"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/74"}],"useCases":["Accessing premium data results via a single micropayment without subscription","Integrating pay-per-call API access into autonomous agent workflows","Fetching lab or experimental results behind an x402 paywall"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.752Z"},"updatedAt":"2026-04-23T00:32:57.880Z"}}