{"id":"ebe13ef4-de04-4640-8ec7-05cc142e5ba4","shortId":"C7mQTC","kind":"x402","title":"Crypto token data via x402 micropayment — $0.02 per request on Base network.","tagline":"Crypto token data via x402 micropayment — $0.02 per request on Base network.","description":"The `/api/v1/tokens/MASK` endpoint on lowpaymentfee.com returns token-level data (likely price, metadata, or market information) for the MASK token. It is part of a broader suite of pay-per-call APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe endpoint is live and returns a standard x402 payment challenge (HTTP 402) requiring an `X-PAYMENT` header with a USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). No API keys or rate limits are advertised — access is gated purely by micropayment. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what fields the token endpoint returns. The specific behavior of this endpoint (e.g., whether it returns price data, metadata, or on-chain analytics for MASK) must be inferred from the URL pattern and the site's Finance & Web3 category listing.","tags":[],"capabilities":["x402-micropayment","usdc-payment","base-network","token-data","crypto-quotes","pay-per-request"],"categories":["finance","crypto"],"synonyms":["MASK token data","crypto token API","token price lookup","x402 token endpoint","micropayment API","MASK crypto","lowpaymentfee"],"warnings":["No API documentation available — all doc pages render only a 'Connect wallet' prompt with no content.","No request or response schema provided; the data returned by /api/v1/tokens/MASK is unknown.","The endpoint's specific functionality (price feed, metadata, analytics) is inferred from URL pattern only.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/MASK","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/MASK","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty (wallet-gated). The actual data returned by this endpoint is unknown, making it effectively a stub 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'0.02':7,19,75,120 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':151 '20':115 '402':101 '6':124 'MASK crypto' 'MASK token data' 'access':134 'addit':175 'address':145 'advertis':133 'ai/ml':64 'analyt':63,212 'api':57,127,161 'base':11,23,83,117,153 'base-network' 'behavior':197 'broader':50 'call':56 'categori':228 'chain':211 'challeng':99 'connect':170 'content':176 'contract':150 'crawl':159 'crypto':1,13 'crypto token API' 'crypto-quotes' 'data':3,15,34,62,206 'decim':125 'descript':187 'doc':160 'document':154 'e.g':201 'endpoint':27,71,90,193,200 'exampl':184 'extrem':156 'field':190 'financ':226 'finance/web3':66 'gate':136 'header':107 'http':100 'i.e':119 'infer':65,217 'inform':40 'infrastructur':68 'key':128 'level':33 'like':35 'limit':131 'list':229 'live':92 'lowpaymentfee' 'lowpaymentfee.com':29,60 'market':39 'mask':43,214 'metadata':37,207 'micropay':6,18,139 'micropayment API' 'must':215 'network':12,24,84 'offer':58 'on-chain':209 'openapi':180 'page':165 'part':47 'pattern':221 'pay':54 'pay-per-cal':53 'pay-per-request' 'payment':98,106,111,141 'per':8,20,55,76 'price':36,73,162,205 'prompt':172 'protocol':88 'pure':137 'rate':130 'readm':164 'render':167 'request':9,21,77 'request/response':183 'requir':102 'return':30,94,194,204 'schema':181 'sent':143 'settl':78 'sinc':121 'site':224 'span':61 'spars':157 'specif':196 'standard':96 'suit':51 'token':2,14,32,44,192 'token price lookup' 'token-data' 'token-level':31 'unit':118 'url':220 'usdc':80,110,122,149 'usdc-payment' 'use':123,147 'util':69 'via':4,16,85 'wallet':171 'web3':227 'whether':202 'x':105 'x-payment':104 'x402':5,17,87,97 'x402 token endpoint' 'x402-micropayment'","prices":[{"id":"7678cad2-5f1a-47db-a859-7b39464a3c2f","listingId":"ebe13ef4-de04-4640-8ec7-05cc142e5ba4","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/MASK","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:08.740Z"}],"sources":[{"listingId":"ebe13ef4-de04-4640-8ec7-05cc142e5ba4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/MASK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:08.740Z","lastSeenAt":"2026-04-24T03:02:52.485Z"}],"details":{"listingId":"ebe13ef4-de04-4640-8ec7-05cc142e5ba4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/MASK \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals = $0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/tokens/MASK"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/tokens/MASK"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve current data or quotes for the MASK token via a single micropayment call","Integrate token lookups into an agent workflow without API key management","Pay-per-use crypto data access for bots or automated trading pipelines"],"bestFor":["Agents needing on-demand token data without subscription commitments","Developers prototyping crypto dashboards with minimal setup","x402-compatible wallets or clients that can settle USDC on Base"],"notFor":["High-frequency trading requiring sub-second latency and bulk data (no documented rate guarantees)","Users who need detailed API documentation or response schema before integrating","Non-crypto use cases unrelated to token data"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.74Z"},"updatedAt":"2026-04-24T03:02:52.485Z"}}