{"id":"78d70b9d-8183-4741-9f00-9c7443c76b33","shortId":"qz29Aa","kind":"x402","title":"Stock data for ticker C via x402 micropayment on Base, $0.02 per request in USDC.","tagline":"Stock data for ticker C via x402 micropayment on Base, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides stock-related data for the ticker symbol \"C\" (Citigroup) through the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance, crypto, and utility APIs — all priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint `/api/v1/stocks/C` accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) which equals $0.02. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the stocks endpoint returns. The endpoint appears to be part of a pattern where each path is a separate x402-gated resource, but the actual data schema must be discovered by making a paid call.","tags":[],"capabilities":["stock-data","x402-micropayment","usdc-payment","base-network","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["stock price API","equity data","Citigroup stock","ticker lookup","stock quote","micropayment API","pay-per-call stock data"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request or response schema documented; actual data fields are unknown","No OpenAPI spec or examples provided","The /api/v1/stocks/C path suggests per-ticker endpoints but the full set of supported tickers is undocumented","Cannot confirm what stock data (price, volume, fundamentals, etc.) is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/C","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/stocks/C","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on request parameters, response schema, or what stock data is actually returned. Docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'0.02':11,26,71,126 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':118 '20':112 '2913':119 '300':138 '6':122 'Citigroup stock' 'accept':94 'actual':202 'address':134 'ai/ml':61 'analyt':60 'api':67,83,148 'appear':183 'base':10,25,79,114,121 'base-network' 'broader':56 'c':5,20,44 'call':212 'chain':132 'challeng':102 'citigroup':45 'confirm':103 'connect':156 'content':162 'crypto':64 'data':2,17,39,59,203 'decim':123 'descript':173 'discov':207 'doc':146 'document':141 'endpoint':32,92,105,179,182 'equal':125 'equity data' 'exampl':170 'extrem':143 'field':176 'financ':63 'gate':198 'infer':62 'json':99 'json-response' 'key':84 'limit':86 'live':107 'lowpaymentfee.com':34 'make':209 'maximum':110 'micropay':8,23 'micropayment API' 'must':205 'network':80 'no-api-key' 'offer':58 'on-chain':130 'openapi':166 'page':151 'paid':211 'part':53,186 'path':192 'pattern':189 'pay-per-call stock data' 'payabl':74 'payment':49,127 'per':12,27,72 'per-request-pricing' 'platform':57 'post':95 'price':69,147 'prompt':158 'protocol':50 'provid':35 'rate':85 'readm':150 'relat':38 'render':153 'request':13,28,73,96,108 'request/response':169 'requir':89 'resourc':199 'return':98,180 'schema':167,204 'second':139 'separ':195 'settl':129 'spars':144 'specif':91 'stock':1,16,37,178 'stock price API' 'stock quote' 'stock-data' 'stock-rel':36 'subscript':88 'symbol':43 'ticker':4,19,42 'ticker lookup' 'timeout':140 'unit':115 'usdc':15,30,76,117 'usdc-payment' 'util':66 'via':6,21 'wallet':157 'x402':7,22,48,101,197 'x402-gated':196 'x402-micropayment'","prices":[{"id":"0fbf7ebb-156c-4a89-9c01-95ac95b5ed2b","listingId":"78d70b9d-8183-4741-9f00-9c7443c76b33","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/stocks/C","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:29.170Z"}],"sources":[{"listingId":"78d70b9d-8183-4741-9f00-9c7443c76b33","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/C","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:29.170Z","lastSeenAt":"2026-04-29T08:05:18.239Z"}],"details":{"listingId":"78d70b9d-8183-4741-9f00-9c7443c76b33","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/C \\\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":"Endpoint returns HTTP 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/C"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/C"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current or recent stock data for Citigroup (ticker C) without needing an API key or subscription","Integrating pay-per-call stock lookups into an AI agent workflow using x402","Prototyping financial dashboards with low-commitment, per-request pricing"],"bestFor":["Agents or developers who want keyless, on-demand stock data with crypto micropayments","Low-volume or sporadic stock data needs where subscriptions are overkill","x402-native applications on the Base network"],"notFor":["High-frequency trading or bulk historical data retrieval (no documented batch endpoints)","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.722Z"},"updatedAt":"2026-04-29T08:05:18.239Z"}}