{"id":"e81d0cfe-3eed-4209-be06-9173adb11c36","shortId":"WSRVAm","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of endpoints across four categories: Data & Analytics (metrics, reports, 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 priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/lab/results/41` is listed under the title \"Premium API Access\" and returns an x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD given 6 decimals). Payment is made via the `exact` scheme to a specified wallet address. The endpoint accepts HTTP POST requests and returns `application/json` responses. No API keys or rate limits are advertised; access is gated entirely by per-request micropayment.\n\nDocumentation is minimal — the crawled site pages beyond the landing page only show a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (402 challenge confirmed), but the actual functionality behind `/api/v1/lab/results/41` is unclear since it doesn't map to any of the publicly listed API categories on the homepage. Users should expect to experiment to discover the request format and response structure.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","micropayment","no-api-key","http-post"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The path /api/v1/lab/results/41 is not listed among the site's publicly advertised APIs — its purpose is unclear","All non-landing crawled pages returned only 'Connect wallet' with no useful content","No request body schema or response examples are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/41","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/41","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, confirming pricing and payment details. However, there is no OpenAPI spec, no documentation for request/response schemas, no examples, and the specific endpoint path (/api/v1/lab/results/41) does not correspond to any publicly listed API on the site. Functionality is essentially 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'/request':19,38 '0.02':18,37,94,136 '000':131 '20':130 '402':220 '6':139 'accept':155 'access':120,171 'across':54 'actual':225 'address':152 'advertis':170 'ai':12,31,63 'analysi':67 'analyt':58 'api':5,24,45,119,164,242 'application/json':161 'avail':215 'base':8,27,102,132 'base usdc api' 'behind':227 'beyond':187 'broad':50 'call':4,23 'categori':56,243 'challeng':125,221 'classif':70 'confirm':222 'connect':194 'convers':87 'crawl':184 'data':11,30,57 'decim':140 'detail':201 'discov':253 'document':180,210 'doesn':233 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,154,217 'entir':174 'estim':81 'exact':146 'exampl':213 'exchang':76 'expect':249 'experi':251 'export':61 'expos':48 'feed':75 'financ':13,32,72 'format':256 'four':55 'function':226 'gas':80 'gate':173 'generat':88 'geocod':85 'given':138 'homepag':246 'http':156 'http-post' 'infrastructur':83 'insight':62 'json-api' 'key':165 'land':189 'learn':65 'limit':168 'list':114,241 'live':219 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':143 'map':235 'marketplac':46 'maxamountrequir':128 'metric':59 'micropay':179 'micropayment' 'micropayment api' 'minim':182 'network':103 'no-api-key' 'offer':10,29 'openapi':205 'page':186,190 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':214 'payment':141 'per':3,22,95,177 'per-request':176 'platform':6,25 'post':157 'premium':118 'price':74,92 'prompt':196 'protocol':107 'public':240 'quot':79 'rate':77,167 'report':60 'request':96,158,178,255 'request/response':208 'respons':162,258 'return':122,160 'schema':209 'scheme':147 'sentiment':66 'set':51 'settl':97 'show':192 'sinc':231 'site':185 'spec':206 'specif':109 'specifi':150 'structur':259 'summar':69 'technic':200 'text':68 'titl':117 'token':78 'unclear':230 'unit':133 'usd':137 'usdc':9,28,99,135 'usdc-base' 'user':247 'util':15,34,84 'valid':86 'via':104,144 'wallet':151,195 'web3':73 'x402':43,106,124 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"39e19761-aa83-401e-8e80-a343f2c0cd04","listingId":"e81d0cfe-3eed-4209-be06-9173adb11c36","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.447Z"}],"sources":[{"listingId":"e81d0cfe-3eed-4209-be06-9173adb11c36","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/lab/results/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.447Z","lastSeenAt":"2026-04-22T01:02:20.199Z"}],"details":{"listingId":"e81d0cfe-3eed-4209-be06-9173adb11c36","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/lab/results/41 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/lab/results/41","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/41"},{"claim":"Site offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports via per-request micropayments","Running AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto and finance data with no API key required","Using utility services like geocoding and validation on a pay-as-you-go basis"],"bestFor":["Developers who want zero-commitment, pay-per-use API access","Agent workflows that can settle USDC micropayments on Base","Prototyping and low-volume use cases where subscription APIs are overkill"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and request/response schemas before integrating","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.164Z"},"updatedAt":"2026-04-22T01:02:20.199Z"}}