{"id":"315ba106-883b-4216-8225-3fbbbebcc4c8","shortId":"EXxhDW","kind":"x402","title":"Pay-per-call token data API for UNI via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call token data API for UNI via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides token data for UNI (Uniswap) via a simple HTTP POST call, paid per-request using the x402 protocol on the Base network. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs across categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. The specific /api/v1/tokens/UNI route sits in the Finance & Web3 category and likely returns token-level data such as price, market cap, or metadata for the UNI token, though the exact response schema is not documented.\n\nDocumentation is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but callers will need to experiment to discover the exact request and response formats.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-settlement","base-network","token-data","crypto-market-data","no-api-key","no-rate-limit"],"categories":["finance","crypto"],"synonyms":["UNI token API","Uniswap token data","crypto token price API","x402 token endpoint","pay-per-call crypto API","Base USDC API","token quotes"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or response schema provided; request/response format must be discovered experimentally","The specific data returned for /api/v1/tokens/UNI is not described anywhere","Platform appears to be a generic multi-endpoint storefront; quality and reliability of underlying data sources is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/UNI","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/UNI","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 with a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no response schema, no example requests or responses, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned is entirely 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'/request':19,38 '0.02':18,37,78,147 '000':82 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':73 '20':81 '402':229 '6':86 'Base USDC API' 'UNI token API' 'Uniswap token data' 'across':130 'ai':135 'analyt':134 'api':7,26,89,129,193 'attach':100 'avail':220 'base':13,32,65,83 'base-network' 'broader':118 'call':4,23,54,128 'caller':98,233 'cap':171 'categori':131,159 'challeng':231 'commit':95 'confirm':224 'connect':201 'content':207 'contract':72 'cost':76 'crypto token price API' 'crypto-market-data' 'data':6,25,45,133,166 'decim':87 'discov':239 'doc':191 'document':185,186 'dozen':123 'endpoint':40,113,222 'exact':180,241 'exampl':218 'experi':237 'extrem':188 'financ':138,157 'format':245 'header':105 'http':52 'includ':132 'infrastructur':141 'key':90 'learn':137 'level':165 'like':161 'limit':92 'live':225 'lowpaymentfee.com':42,120 'machin':136 'market':170 'metadata':173 'need':235 'network':66 'no-api-key' 'no-rate-limit' 'offer':122 'openapi':211 'page':196 'paid':55 'part':115 'pay':2,21,126 'pay-per-cal':1,20,125 'pay-per-call crypto API' 'payload':219 'payment':67,104,110 'per':3,22,57,79,127,148 'per-call-pricing' 'per-request':56 'platform':119 'post':53 'price':144,169,192 'prompt':203 'proof':111 'proper':228 'protocol':62 'provid':43 'rate':91 'readm':195 'render':198 'request':58,80,149,242 'requir':97 'respons':181,214,244 'return':162,226 'rout':153 'schema':182,215 'settl':14,33,69 'simpl':51 'simpli':99 'sit':154 'spars':189 'spec':212 'specif':151 'though':178 'token':5,24,44,164,177 'token quotes' 'token-data' 'token-level':163 'uni':9,28,47,176 'uniform':145 'uniswap':48 'unit':84 'upfront':94 'usdc':16,35,71 'usdc-settlement' 'use':59 'util':142 'valid':108 'via':10,29,49 'wallet':202 'web3':139,158 'x':103 'x-payment':102 'x402':11,30,61,109,230 'x402 token endpoint' 'x402-payment'","prices":[{"id":"ef5961cf-8522-482a-8e04-2b1a5b8d3a1d","listingId":"315ba106-883b-4216-8225-3fbbbebcc4c8","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/UNI","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:15.865Z"}],"sources":[{"listingId":"315ba106-883b-4216-8225-3fbbbebcc4c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/UNI","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:15.865Z","lastSeenAt":"2026-04-23T21:32:34.593Z"}],"details":{"listingId":"315ba106-883b-4216-8225-3fbbbebcc4c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/UNI \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/tokens/UNI"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/UNI"}],"useCases":["Fetching current UNI token data (price, metadata) on demand","Integrating token information into trading bots or dashboards without API key management","Agent-driven crypto data retrieval with micropayment settlement"],"bestFor":["Agents or bots that need on-demand UNI token data without subscription overhead","Developers prototyping crypto dashboards who want instant access with no signup","x402-compatible wallets and agents on the Base network"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing comprehensive historical token data or OHLCV candles (not documented)","Anyone requiring detailed API documentation or response schema before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.333Z"},"updatedAt":"2026-04-23T21:32:34.593Z"}}