{"id":"7597c234-c4a2-4dfc-9b51-d10b6f4fbb62","shortId":"kWqwJg","kind":"x402","title":"Real-time ADA (Cardano) token price via x402 micropayment on Base for $0.02 per request.","tagline":"Real-time ADA (Cardano) token price via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current price of ADA (Cardano) in a pay-per-call model using the x402 protocol. It is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint `/api/v1/tokens/ADA/price` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 — consistent with the site's published pricing. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is live (returns a proper 402 challenge), but the exact response format for a successful paid request must be inferred.","tags":[],"capabilities":["token-price","crypto-market-data","x402-payment","base-network","usdc-settlement","pay-per-call","no-api-key","ada-cardano"],"categories":["finance","crypto"],"synonyms":["ADA price API","Cardano price feed","crypto token price","real-time ADA price","x402 crypto API","micropayment price feed","Base USDC API"],"warnings":["No OpenAPI specification or schema documentation available","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no technical content","Response format for a successful paid request is completely undocumented","Request body schema (if any) is unknown — it may accept an empty POST or require parameters"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/ADA/price","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/tokens/ADA/price","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. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, and all doc pages render only a wallet-connect prompt. The exact response schema and any request body parameters are 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'0.02':14,30,79,131 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '300':150 '402':196 '6':126 'ADA price API' 'Base USDC API' 'Cardano price feed' 'accept':96 'ada':4,20,40 'ada-cardano' 'addit':173 'address':144 'advertis':116 'ai/ml':69 'analyt':68 'api':61,84,159 'avail':188 'base':12,28,107,122 'base-network' 'broader':58 'call':47 'cardano':5,21,41 'challeng':115,197 'commit':91 'connect':168 'consist':132 'contract':111 'crawl':157 'crypto token price' 'crypto-market-data' 'current':37 'data':67,72 'decim':127 'detail':175 'doc':158 'document':152 'endpoint':34,94,190 'equal':130 'exact':200 'exampl':186 'extrem':154 'finance/web3':71 'format':202 'infer':70,210 'json':101 'key':85 'limit':88 'live':192 'lowpaymentfee.com':64 'maxamountrequir':118 'micropay':10,26 'micropayment price feed' 'model':48 'must':208 'network':108 'no-api-key' 'offer':62 'openapi':179 'page':163 'paid':206 'part':55 'pay':45 'pay-per-cal':44 'pay-per-call' 'payload':187 'payment':102,140 'per':15,31,46,80 'post':97 'price':7,23,38,77,138,160 'prompt':170 'proper':195 'protocol':52 'publish':137 'rate':87 'readm':162 'real':2,18 'real-tim':1,17 'real-time ADA price' 'render':165 'request':16,32,81,98,207 'request/response':182 'respons':201 'return':35,100,193 'schema':183 'second':151 'sent':142 'servic':75 'settl':104 'site':135 'span':66 'spars':155 'spec':180 'specif':93 'success':205 'suit':59 'technic':174 'time':3,19 'timeout':148 'token':6,22 'token-price' 'unit':123 'usdc':110,129 'usdc-settlement' 'use':49,109 'util':74 'via':8,24 'wallet':169 'x402':9,25,51,114 'x402 crypto API' 'x402-payment'","prices":[{"id":"37ae2006-0d04-4a06-acbc-e45b050abf5f","listingId":"7597c234-c4a2-4dfc-9b51-d10b6f4fbb62","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/tokens/ADA/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:53.409Z"}],"sources":[{"listingId":"7597c234-c4a2-4dfc-9b51-d10b6f4fbb62","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/ADA/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:53.409Z","lastSeenAt":"2026-04-23T20:01:24.105Z"}],"details":{"listingId":"7597c234-c4a2-4dfc-9b51-d10b6f4fbb62","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/ADA/price \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/tokens/ADA/price"},{"claim":"All APIs 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/ADA/price"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current ADA/Cardano price for portfolio tracking or trading bots","Integrating real-time token pricing into a DeFi dashboard without managing API keys","Agent-driven crypto price lookups settled via x402 micropayments on Base"],"bestFor":["Developers who want keyless, pay-per-call crypto price data","AI agents that need on-demand ADA pricing with x402 settlement","Prototyping crypto apps without subscription commitments"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing (no documented rate guarantees)","Users who need historical price data or OHLCV candles (only current price is indicated)","Non-crypto payment workflows — requires USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:31:34.623Z"},"updatedAt":"2026-04-23T20:01:24.105Z"}}