{"id":"6bb9ed28-2eb8-4ea4-8cfa-ef513f61628e","shortId":"QyU3eS","kind":"x402","title":"Pay-per-call market quote endpoint on Base via x402, $0.02/request in USDC.","tagline":"Pay-per-call market quote endpoint on Base via x402, $0.02/request in USDC.","description":"This endpoint at `/api/v1/market/quote/WM` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol APIs spanning data analytics, AI/ML inference, finance, and utility services. Each call is settled on the Base network using USDC at $0.02 per request with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint probed (`/market/quote/WM`) appears to serve market quote data — likely for a ticker or asset identified as \"WM.\" It accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, advertising a max amount of 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform lists 16+ endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 per-request pricing. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["market-quote","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["market quote API","stock quote","WM ticker","price quote","x402 finance API","pay-per-request market data","lowpaymentfee"],"warnings":["No request or response schema available — the docs, pricing, and README pages all render only a 'Connect wallet' prompt.","The exact data returned by /market/quote/WM is unknown; 'WM' ticker/asset identity is not documented.","No rate-limit or SLA information is published.","The platform lists many endpoints but none have publicly visible documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/WM","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/market/quote/WM","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 with clear pricing, but there is no OpenAPI schema, no documented request/response format, and the docs pages are gated behind wallet connection. The purpose of the 'WM' quote endpoint is inferred from the URL path and site context 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'/market/quote/wm':86 '/request':13,28 '0.02':12,27,70,133,195 '000':123 '0x8335':128 '16':157 '20':122 '300':149 '6':137 'WM ticker' 'accept':103 'across':159 'advertis':117 'ai':168 'ai/ml':53 'amount':120 'analyt':52,163 'api':49,75 'appear':87,204 'asset':98 'avail':218 'base':9,24,65,124,130 'base-network' 'broader':153 'call':4,19,60 'categori':161 'challeng':111 'classif':173 'collect':44 'confirm':112 'connect':209 'convers':189 'crawl':221 'data':51,92,162 'decim':138 'detail':213 'document':200 'embed':174 'endpoint':7,22,32,84,114,158 'equal':132 'estim':184 'exact':145 'exchang':179 'exist':202 'export':166 'feed':178 'financ':55,175 'four':160 'gas':183 'generat':190 'geocod':187 'given':134 'identifi':99 'infer':54 'infrastructur':186 'insight':167 'json':108 'json-response' 'key':76 'learn':170 'like':93 'limit':78 'list':156 'live':116 'lowpaymentfee' 'lowpaymentfee.com':39,154 'machin':169 'made':141 'market':5,20,90 'market quote API' 'market-quote' 'max':119 'metric':164 'network':66 'no-api-key' 'offer':42 'page':201 'part':36 'pay':2,17 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request market data' 'payment':139 'per':3,18,71,197 'per-request':196 'platform':40,155 'post':104 'price':177,199 'price quote' 'probe':85 'protocol':48 'quot':6,21,91,182 'rate':77,180 'report':165 'request':72,105,198 'request/response':214 'requir':81,206 'return':107 'schema':215 'scheme':146 'second':150 'sentiment':171 'serv':89 'servic':58 'settl':62 'share':192 'span':50 'specif':83 'stock quote' 'subscript':80 'summar':172 'ticker':96 'timeout':151 'token':181 'unit':125 'usdc':15,30,68,127,135 'usdc-settlement' 'use':67 'util':57 'valid':188 'via':10,25,142 'view':211 'wallet':208 'web3':176 'wm':101 'x402':11,26,47,110,144 'x402 finance API' 'x402-payment' 'x402-protocol':46","prices":[{"id":"9c7fbe06-d73c-493d-894d-8c4b7109c406","listingId":"6bb9ed28-2eb8-4ea4-8cfa-ef513f61628e","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/market/quote/WM","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:05.480Z"}],"sources":[{"listingId":"6bb9ed28-2eb8-4ea4-8cfa-ef513f61628e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/WM","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:05.480Z","lastSeenAt":"2026-04-23T20:01:24.976Z"}],"details":{"listingId":"6bb9ed28-2eb8-4ea4-8cfa-ef513f61628e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/WM \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/market/quote/WM"},{"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 16+ endpoints across Data & Analytics, AI & ML, 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/market/quote/WM"}],"useCases":["Fetching real-time or on-demand market quotes for the WM ticker/asset","Integrating pay-per-call market data into trading bots or dashboards","Agent-driven financial data retrieval without API key management"],"bestFor":["Developers who want zero-setup market data access via crypto micropayments","AI agents that need on-demand financial quotes without subscription overhead","Projects already operating on the Base network with USDC"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need bulk historical market data downloads","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:03:21.119Z"},"updatedAt":"2026-04-23T20:01:24.976Z"}}