{"id":"beec4690-7b56-4250-a6b2-ee7fe3f8b69b","shortId":"hXSgpc","kind":"x402","title":"Pay-per-call stock data for ticker LIN via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call stock data for ticker LIN via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides stock data for the ticker LIN (Linde plc) through a simple POST request, paid per call using the x402 protocol. Payment is settled on the Base network in USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced uniformly at $0.02 per request. The specific /api/v1/stocks/LIN route returns JSON and is discoverable via HTTP POST. However, documentation is extremely sparse: the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail, schema definitions, or example responses.\n\nBecause no response schema, field definitions, or sample payloads are documented, callers should expect to discover the response format empirically. The x402 challenge is live and well-formed, confirming the endpoint is operational. The payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, the USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base mainnet, and the maximum timeout is 300 seconds.","tags":[],"capabilities":["stock-data","per-call-payment","x402-protocol","usdc-settlement","base-network","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["stock price API","LIN stock data","Linde stock quote","pay-per-call stock API","x402 stock endpoint","crypto-paid finance API","Base USDC API"],"warnings":["No response schema or example response is documented anywhere — output format must be discovered empirically.","Docs, pricing, and API pages are effectively empty (only show 'Connect wallet').","The specific stock data source, freshness, and coverage are undocumented.","No SLA, uptime guarantee, or rate-limit information is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/LIN","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/LIN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no documented response schema, no example responses, no OpenAPI spec, and all doc/pricing/API pages render only 'Connect wallet' with no usable content. The actual data returned is 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'/request':19,38 '0.02':18,37,79,144 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':226 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':232 '20':82 '300':241 '6':87 'Base USDC API' 'LIN stock data' 'Linde stock quote' 'address':224 'ai/ml':132 'analyt':131 'api':90,128,168 'asset':229 'attach':101 'base':13,32,69,84,234 'base-network' 'broader':119 'call':4,23,59,127 'caller':99,198 'challeng':209 'coin':74 'commit':96 'confirm':216 'connect':174 'contract':230 'cost':77 'crypto-paid finance API' 'data':6,25,45,130,136 'decim':88 'definit':183,192 'detail':181 'discov':202 'discover':155 'doc':165 'document':160,197 'dozen':122 'empir':206 'endpoint':40,114,218 'exampl':185 'expect':200 'extrem':162 'field':191 'finance/crypto':134 'form':215 'format':205 'header':106 'howev':159 'http':157 'infer':133 'json':152 'json-response' 'key':91 'limit':93 'lin':9,28,49 'lind':50 'live':211 'lowpaymentfee.com':42 'mainnet':235 'market':135 'maximum':238 'network':70 'no-api-key' 'offer':121 'oper':220 'page':169 'paid':57 'part':116 'pay':2,21,125 'pay-per-cal':1,20,124 'pay-per-call stock API' 'payload':195 'payment':64,105,111,222 'per':3,22,58,80,126,145 'per-call-payment' 'platform':120 'plc':51 'post':55,158 'price':141,166 'prompt':176 'proof':112 'protocol':63 'provid':43 'rate':92 'recipi':223 'render':171 'request':56,81,146 'requir':98 'respons':186,189,204 'return':151 'rout':150 'sampl':194 'schema':182,190 'second':242 'servic':139 'settl':14,33,66 'simpl':54 'simpli':100 'span':129 'spars':163 'specif':148 'stock':5,24,44 'stock price API' 'stock-data' 'technic':180 'ticker':8,27,48 'timeout':239 'uniform':142 'unit':85 'upfront':95 'usd':73 'usdc':16,35,72,228 'usdc-settlement' 'use':60 'util':138 'valid':109 'via':10,29,156 'wallet':175 'well':214 'well-form':213 'x':104 'x-payment':103 'x402':11,30,62,110,208 'x402 stock endpoint' 'x402-protocol'","prices":[{"id":"bc4e3b4d-9f58-4cc6-a793-6df652f504d7","listingId":"beec4690-7b56-4250-a6b2-ee7fe3f8b69b","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/LIN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:59.990Z"}],"sources":[{"listingId":"beec4690-7b56-4250-a6b2-ee7fe3f8b69b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/LIN","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:59.990Z","lastSeenAt":"2026-04-29T17:04:30.716Z"}],"details":{"listingId":"beec4690-7b56-4250-a6b2-ee7fe3f8b69b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/LIN \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/LIN"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units, USDC 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/stocks/LIN"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/LIN"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current or recent stock data for Linde plc (LIN) without needing an API key or subscription","Integrating stock lookups into an AI agent workflow that can settle micropayments on Base","Building trading dashboards or alerts that pay per data request rather than monthly"],"bestFor":["Agents or bots that need on-demand stock data with crypto-native payment","Developers who want zero-signup, pay-as-you-go financial data","x402-compatible clients on the Base network"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing comprehensive historical stock data or bulk downloads","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.03Z"},"updatedAt":"2026-04-29T17:04:30.716Z"}}