{"id":"8101adfc-accb-4576-bcf6-9430c5a8d1f2","shortId":"GDEM2b","kind":"x402","title":"Pay-per-call token data for ADA via x402 on Base — $0.02/request in USDC.","tagline":"Pay-per-call token data for ADA via x402 on Base — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides on-demand data for the ADA (Cardano) token, accessible via the x402 payment protocol. Each call costs $0.02, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to a POST request and receive a JSON response.\n\nThe endpoint is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services, all priced uniformly at $0.02 per request. The specific `/api/v1/tokens/ADA` path sits within the Finance & Web3 category, likely returning price or market data for the ADA token, though the exact response schema is not documented.\n\nThe x402 challenge is live and well-formed: it advertises USDC (contract 0x8335…2913 on Base) with a maxAmountRequired of 20000 base units, which equals $0.02 (20000 / 10^6). The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. Timeout is 300 seconds. Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail, so the exact request parameters and response fields are unknown.","tags":[],"capabilities":["token-data","ada-cardano","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["ADA price","Cardano token data","crypto token quote","ADA market data","x402 crypto API","pay-per-request token API"],"warnings":["No documentation available — docs, pricing, and API pages render only a 'Connect wallet' prompt","Response schema for /api/v1/tokens/ADA is completely unknown; the endpoint may return price data, metadata, or something else","No OpenAPI spec or example responses provided by the site","Platform appears to be a generic template with many uniform $0.02 endpoints; unclear how mature or reliable the underlying data sources are"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/ADA","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","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 pricing is clear ($0.02 USDC on Base), but there is no documentation of request parameters, response schema, or examples. The docs/pricing/API pages are all blank beyond a wallet-connect prompt, making it impossible to verify what data is actually 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'/request':14,30 '0.02':13,29,56,120,177 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':185 '0x8335':164 '10':179 '20000':172,178 '2913':165 '300':188 '6':180 'ADA market data' 'ADA price' 'Cardano token data' 'access':47 'account':67 'ada':8,24,44,141 'ada-cardano' 'advertis':161 'ai/ml':108 'analyt':107 'api':65,104,201 'attach':75 'base':12,28,62,167,173 'broader':95 'call':4,20,54,103 'caller':73 'cardano':45 'categori':132 'challeng':153 'connect':207 'contract':163 'cost':55 'crypto token quote' 'data':6,22,41,106,112,138 'demand':40 'detail':213 'doc':198 'document':150,190 'dozen':98 'endpoint':34,90 'equal':176 'exact':145,216 'extrem':195 'field':221 'financ':130 'finance/web3':110 'form':159 'header':79 'infer':109 'json':87 'json-response' 'key':66 'like':133 'limit':70 'live':155 'lowpaymentfee.com':36 'market':111,137 'maxamountrequir':170 'network':63 'no-api-key' 'offer':97 'on-demand':38 'page':202 'paramet':218 'part':92 'path':126 'pay':2,18,101 'pay-per-cal':1,17,100 'pay-per-call' 'pay-per-request token API' 'payment':51,78,182 'per':3,19,102,121 'platform':96 'post':82 'price':117,135,199 'prompt':209 'protocol':52 'provid':37 'rate':69 'receiv':85 'recipi':183 'render':204 'request':83,122,217 'requir':72 'respons':88,146,220 'return':134 'schema':147 'second':189 'servic':115 'settl':57 'simpli':74 'sit':127 'site':193 'span':105 'spars':196 'specif':124 'though':143 'timeout':186 'token':5,21,46,142 'token-data' 'uniform':118 'unit':174 'unknown':223 'usdc':16,32,59,162 'usdc-base' 'util':114 'via':9,25,48 'wallet':208 'web3':131 'well':158 'well-form':157 'within':128 'x402':10,26,50,77,152 'x402 crypto API' 'x402-payment'","prices":[{"id":"be195d44-5271-4dd7-8a16-7616e0636e53","listingId":"8101adfc-accb-4576-bcf6-9430c5a8d1f2","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:52.803Z"}],"sources":[{"listingId":"8101adfc-accb-4576-bcf6-9430c5a8d1f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/ADA","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:52.803Z","lastSeenAt":"2026-04-23T20:01:24.064Z"}],"details":{"listingId":"8101adfc-accb-4576-bcf6-9430c5a8d1f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/ADA \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/tokens/ADA"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/ADA"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current ADA/Cardano token data (likely price or quote) without needing an API key or account","Integrating low-cost, per-call crypto data into autonomous agents that settle payments on Base","Building dashboards or bots that pull ADA market information on demand"],"bestFor":["Agents or scripts that need occasional ADA token lookups without subscription overhead","Developers wanting frictionless, wallet-authenticated crypto data access","x402-native workflows on the Base network"],"notFor":["High-frequency trading requiring sub-second latency and guaranteed SLAs","Users who need detailed historical OHLCV data or order-book depth (no evidence this is provided)","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:19:01.562Z"},"updatedAt":"2026-04-23T20:01:24.064Z"}}