{"id":"14459bb6-0d6a-4fe7-aa3c-1e9b9b5382b8","shortId":"ysqAMX","kind":"x402","title":"Get the current USDT token price via x402 micropayment on Base for $0.02 per request.","tagline":"Get the current USDT token price via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current price of USDT (Tether) as a JSON response, gated behind an x402 payment challenge on the Base network. 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 and settled in USDC on Base.\n\nThe specific endpoint `/api/v1/tokens/USDT/price` accepts POST requests and requires an X-PAYMENT header conforming to the x402 protocol (version 1, \"exact\" scheme). The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation on the site is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format after successful payment is unknown.","tags":[],"capabilities":["token-price-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["USDT price API","Tether price","token price feed","crypto price endpoint","stablecoin price","x402 price API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — response format after payment is unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The endpoint path suggests USDT price data but no sample response confirms this","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/USDT/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/USDT/price","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 in USDC on Base). However, there is no OpenAPI spec, no response schema, no example payloads, and documentation pages are empty stubs. The actual data returned after payment is entirely unknown, making this effectively a stub 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'/api/v1/tokens/usdt/price':92 '/docs':169 '/pricing':170 '/readme':173 '0.02':13,28,80,129 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':123 '1':109 '20':117 '2913':124 '300':144 '402':211 '6':133 'Tether price' 'USDT price API' 'accept':93 'access':154 'actual':215 'advertis':153 'ai/ml':70 'amount':114 'analyt':69 'api':62,147 'base':11,26,52,88,119,126 'base-network' 'behind':45 'broader':59 'call':160 'challeng':49,212 'confirm':206 'conform':103 'connect':179 'crypto price endpoint' 'current':3,18,35 'data':68,73 'decim':134 'descript':198 'detail':186 'document':161 'endpoint':32,91,204 'equal':128 'exact':110 'exampl':193 'extrem':166 'finance/web3':72 'format':217 'gate':44 'get':1,16 'given':130 'header':102 'infer':71 'json':42 'key':148 'limit':151 'live':207 'lowpaymentfee.com':65 'maximum':113 'micropay':9,24 'micropayment API' 'network':53 'no-api-key' 'offer':63 'openapi':190 'page':174 'part':56 'pay':158 'pay-per-cal':157 'pay-per-request' 'payload':195 'payment':48,101,135,220 'per':14,29,81,159 'post':94 'price':6,21,36,78 'prompt':181 'proper':210 'protocol':107 'pure':156 'rate':150 'render':176 'request':15,30,82,95 'request/response':194 'requir':97,115 'respons':43,201,216 'return':33,208 'schema':202 'scheme':111 'second':145 'sent':137 'servic':76 'settl':84 'site':164 'span':67 'spec':191 'specif':90 'stablecoin price' 'success':219 'suit':60 'technic':185 'tether':39 'thin':167 'timeout':142 'token':5,20 'token price feed' 'token-price-lookup' 'unit':120 'unknown':222 'usdc':86,122,131 'usdc-settlement' 'usdt':4,19,38 'util':75 'version':108 'via':7,22 'wallet':180 'x':100 'x-payment':99 'x402':8,23,47,106 'x402 price API' 'x402-micropayment'","prices":[{"id":"2c24bf0c-32c2-4606-af9d-493a2442763c","listingId":"14459bb6-0d6a-4fe7-aa3c-1e9b9b5382b8","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/USDT/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":"2026-04-18T18:57:12.251Z"}],"sources":[{"listingId":"14459bb6-0d6a-4fe7-aa3c-1e9b9b5382b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/USDT/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:12.251Z","lastSeenAt":"2026-04-23T21:32:34.424Z"}],"details":{"listingId":"14459bb6-0d6a-4fe7-aa3c-1e9b9b5382b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/USDT/price \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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","source_url":"https://lowpaymentfee.com/api/v1/tokens/USDT/price"},{"claim":"All APIs on the site 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":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/USDT/price"}],"useCases":["Fetching the current USDT price for portfolio tracking or trading bots","Integrating real-time USDT pricing into a DeFi application","Agent-driven price checks where per-call micropayments replace API key management","Comparing USDT price across sources for arbitrage detection"],"bestFor":["AI agents or bots that need on-demand USDT price data without managing API keys","Developers who prefer crypto micropayments over subscription billing","Low-volume or sporadic price lookups where $0.02/call is cost-effective"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing (no documented rate guarantees)","Users who need detailed OHLCV or historical price data (only current price is implied)","Anyone requiring comprehensive documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.573Z"},"updatedAt":"2026-04-23T21:32:34.424Z"}}