{"id":"a17cf9ae-b1eb-4123-a2de-96f593b97cdf","shortId":"NNrD4Y","kind":"x402","title":"Pay-per-call stock quote API for AXP (American Express) via x402 on Base, settled in USDC.","tagline":"Pay-per-call stock quote API for AXP (American Express) via x402 on Base, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides stock data for AXP (American Express) through a simple POST request, paid per call using the x402 protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The payment is settled on-chain to a specified wallet address.\n\nThe provider operates a broader platform offering dozens of pay-per-call endpoints across categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all at the same $0.02/request price point. The specific endpoint probed here (`/api/v1/stocks/AXP`) appears to be a stock-specific route, likely returning quote or price data for the American Express (AXP) ticker symbol.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no example request/response payloads, and no description of the response format beyond the MIME type `application/json`. The endpoint is confirmed live via a valid x402 402 challenge.","tags":[],"capabilities":["stock-quote","per-call-payment","x402-protocol","usdc-settlement","base-network","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["stock price API","AXP quote","American Express stock data","pay-per-call stock API","x402 stock endpoint","crypto-paid finance API","USDC stock data"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' prompt","No OpenAPI or output schema describing the response payload","No example requests or responses available; response structure is unknown","The /api/v1/stocks/AXP path is not listed on the provider's homepage among their advertised endpoints, so its availability and behavior are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/AXP","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/AXP","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and all documentation pages returned only a wallet-connect prompt. The actual response format and data fields are entirely 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'/request':124 '0.02':63,123 '402':207 'AXP quote' 'American Express stock data' 'USDC stock data' 'across':106 'address':91 'ai':111 'american':10,28,46,149 'analyt':110 'api':7,25,71,161 'appear':133 'application/json':197 'axp':9,27,45,151 'base':15,33,68 'base-network' 'beyond':193 'broader':96 'call':4,22,55,104 'categori':107 'chain':86 'challeng':208 'confirm':201 'connect':170 'content':176 'cost':62 'crawl':159 'crypto-paid finance API' 'data':43,109,146 'descript':188 'doc':160 'document':154 'dozen':99 'endpoint':38,105,129,199 'exampl':183 'express':11,29,47,150 'extrem':156 'financ':114 'format':192 'includ':108 'infrastructur':117 'json-response' 'key':72 'learn':113 'like':141 'limit':75 'live':202 'lowpaymentfee.com':40 'machin':112 'mime':195 'network':69 'no-api-key' 'offer':98 'on-chain':84 'openapi':180 'oper':94 'page':165 'paid':53 'pay':2,20,102 'pay-per-cal':1,19,101 'pay-per-call stock API' 'payload':185 'payment':81 'per':3,21,54,103 'per-call-payment' 'platform':97 'point':126 'post':51 'price':125,145,162 'probe':130 'prompt':172 'protocol':59 'provid':41,93 'quot':6,24,143 'rate':74 'readm':164 'request':52,61 'request/response':184 'requir':79 'respons':191 'return':142,167 'rout':140 'schema':181 'settl':16,34,83 'simpl':50 'spars':157 'specif':128,139 'specifi':89 'stock':5,23,42,138 'stock price API' 'stock-quote' 'stock-specif':137 'subscript':78 'symbol':153 'ticker':152 'type':196 'usdc':18,36,65 'usdc-settlement' 'use':56 'util':118 'valid':205 'via':12,30,203 'wallet':90,171 'web3':115 'x402':13,31,58,206 'x402 stock endpoint' 'x402-protocol'","prices":[{"id":"989cfbf5-25b8-4956-af9a-7184c8bbe6b6","listingId":"a17cf9ae-b1eb-4123-a2de-96f593b97cdf","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/AXP","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:08.949Z"}],"sources":[{"listingId":"a17cf9ae-b1eb-4123-a2de-96f593b97cdf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/AXP","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:08.949Z","lastSeenAt":"2026-04-23T20:01:30.328Z"}],"details":{"listingId":"a17cf9ae-b1eb-4123-a2de-96f593b97cdf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/AXP \\\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 requesting $0.02 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stocks/AXP"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/AXP"},{"claim":"Documentation, API, pricing, and README pages all show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching real-time or recent stock data for American Express (AXP) without needing an API key or subscription","Integrating stock lookups into autonomous AI agents that can pay per call via x402","Building lightweight financial dashboards that pay only for the data they consume"],"bestFor":["Agents or bots that need on-demand stock quotes without managing API credentials","Developers experimenting with x402 pay-per-call patterns for financial data","Low-volume stock data consumers who want to avoid subscription commitments"],"notFor":["High-frequency trading or bulk historical data retrieval (no documented batch endpoints)","Users who need comprehensive documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:32:44.197Z"},"updatedAt":"2026-04-23T20:01:30.328Z"}}