{"id":"61913e41-8864-42ac-b31b-2f57a57b05b7","shortId":"77vTxp","kind":"x402","title":"x402-gated token data endpoint returning ZRX information for $0.02 per request on Base.","tagline":"x402-gated token data endpoint returning ZRX information for $0.02 per request on Base.","description":"This endpoint at lowpaymentfee.com provides token data for ZRX (0x Protocol token) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/tokens/ZRX` sits under the Finance & Web3 category of the platform. Based on the URL pattern and the platform's other crypto-related endpoints (token quotes, gas estimates, price feeds, exchange rates), this endpoint likely returns token metadata or pricing information for the ZRX token. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02.\n\nThe platform advertises no API keys, no rate limits, and instant access. All authentication and billing is handled through the x402 payment header. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the exact response format and fields returned by this endpoint are unknown.","tags":[],"capabilities":["x402-payment","token-data","crypto-market-data","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["ZRX token data","0x protocol token API","crypto token info","token price lookup","Web3 token endpoint","ZRX market data"],"warnings":["No OpenAPI or response schema available — exact response fields are unknown","Documentation pages (/docs, /pricing, /README) returned no useful content","The /api/v1/tokens/ZRX path is not explicitly listed on the homepage; it may be an undocumented or dynamically-routed endpoint","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/ZRX","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/ZRX","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, there is no OpenAPI schema, no documented response format, no example responses, and the docs/pricing/README pages are empty stubs. The exact data returned is unknown, making this effectively a stub 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'0.02':11,26,78,164 '000':154 '0x':40 '0x protocol token API' '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':159 '20':153 'Web3 token endpoint' 'ZRX market data' 'ZRX token data' 'accept':145 'access':176 'advertis':167 'ai/ml':67 'analyt':66 'api':62,169 'authent':178 'base':15,30,87,102,155,161 'base-network' 'bill':180 'broader':53 'call':61 'categori':98 'challeng':139 'confirm':140 'connect':211 'content':217 'crawl':200 'crypto':113 'crypto token info' 'crypto-market-data' 'crypto-rel':112 'data':5,20,37,65,71 'detail':191 'doc':202 'document':192 'dozen':56 'endpoint':6,21,32,63,91,115,125,142,230 'equal':163 'estim':119 'exact':222 'exampl':194 'exchang':122 'feed':121 'field':226 'financ':96 'finance/web3':69 'format':224 'found':197 'gas':118 'gate':3,18 'handl':182 'header':187 'infer':68 'inform':9,24,132 'instant':175 'key':170 'like':126 'limit':173 'live':144 'lowpaymentfee.com':34 'market':70 'metadata':129 'network':88 'no-api-key' 'offer':55 'openapi':189 'page':206 'part':50 'pattern':106 'pay':59 'pay-per-cal':58 'pay-per-request' 'payment':46,151,186 'per':12,27,60,79 'platform':54,101,109,166 'post':146 'price':76,120,131,203 'prompt':213 'protocol':41,47 'provid':35 'quot':117 'rate':123,172 'readm':205 'relat':114 'request':13,28,80,147 'requir':149 'respons':195,223 'result':220 'return':7,22,127,208,227 'schema':190 'servic':74 'settl':82 'sit':93 'span':64 'specif':90 'substant':216 'token':4,19,36,42,116,128,136 'token price lookup' 'token-data' 'unit':156 'unknown':232 'url':105 'usdc':84,158 'usdc-settlement' 'util':73 'via':43 'wallet':212 'web3':97 'x402':2,17,45,138,185 'x402-gated':1,16 'x402-payment' 'zrx':8,23,39,135","prices":[{"id":"fa3c8d48-583d-44e4-bf17-aa04b758fbc3","listingId":"61913e41-8864-42ac-b31b-2f57a57b05b7","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/ZRX","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:23.703Z"}],"sources":[{"listingId":"61913e41-8864-42ac-b31b-2f57a57b05b7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/ZRX","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:23.703Z","lastSeenAt":"2026-04-23T19:01:40.430Z"}],"details":{"listingId":"61913e41-8864-42ac-b31b-2f57a57b05b7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/ZRX \\\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 HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/ZRX"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/ZRX"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Finance & Web3 endpoints including token quotes, gas estimates, price feeds, and exchange rates","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving ZRX token metadata or pricing on demand without an API key","Integrating pay-per-call crypto data into trading bots or dashboards","Agent-driven token lookups settled instantly via x402 on Base"],"bestFor":["Developers needing lightweight, keyless access to ZRX token data","AI agents that can settle micropayments via x402 on Base","Applications requiring on-demand crypto token information without subscriptions"],"notFor":["Bulk historical token data retrieval (no evidence of batch or historical endpoints)","Users who cannot transact in USDC on the Base network","Production use cases requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.972Z"},"updatedAt":"2026-04-23T19:01:40.430Z"}}