{"id":"9ace43cb-4fcd-4ff9-8040-d8ed075d453f","shortId":"PRBdrQ","kind":"x402","title":"Get the current USDC token price via x402 micropayment on Base for $0.02 per request.","tagline":"Get the current USDC token price via x402 micropayment on Base for $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns the current price of USDC via a pay-per-call x402 protocol. It is part of a broader suite of APIs offered by the same provider covering data analytics, AI/ML inference, finance/Web3 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/USDC/price` is a POST endpoint that returns JSON. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payee address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation beyond the landing page is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional 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 data source, update frequency, and response format are unknown.","tags":[],"capabilities":["token-price-lookup","x402-micropayment","usdc-payment","base-network","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["USDC price API","token price feed","crypto price endpoint","stablecoin price","x402 price API","micropayment API","Base network API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/API pages return only a 'Connect wallet' prompt with no content","Data source and update frequency for USDC price are undocumented","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/USDC/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/USDC/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 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no example request or response, and all documentation pages beyond the landing page are empty ('Connect wallet' only). The actual response schema and data source are completely unknown, making this effectively a stub 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'0.02':13,28,76,128 '000':124 '20':123 '402':205 '6':132 'Base network API' 'USDC price API' 'access':148 'actual':209 'addit':178 'address':137 'advertis':147 'ai/ml':66 'analyt':65 'api':57,141,164 'attach':109 'base':11,26,85,125,139 'base-network' 'beyond':155 'broader':54 'call':46 'caller':108 'challeng':206 'confirm':200 'connect':173 'cover':63 'crypto price endpoint' 'current':3,18,37 'data':64,69,210 'decim':133 'descript':192 'detail':180 'doc':163 'document':154 'endpoint':32,89,94,198 'exact':105 'exact-pay':104 'exampl':187 'extrem':160 'finance/web3':68 'format':216 'frequenc':213 'gate':150 'get':1,16 'handl':100 'header':114 'i.e':127 'infer':67 'json':97 'key':142 'land':157 'limit':145 'live':201 'lowpaymentfee.com':34 'micropay':9,24,153 'micropayment API' 'network':86 'no-api-key' 'offer':58 'openapi':184 'page':158,168 'part':51 'pay':44 'pay-per-cal':43 'pay-per-request' 'paye':136 'payload':189 'payment':98,106,113,119 'per':14,29,45,77 'post':93 'price':6,21,38,74,165 'prompt':175 'proper':204 'protocol':48 'provid':62 'pure':151 'rate':144 'readm':167 'render':170 'request':15,30,78 'request/response':188 'respons':195,215 'return':35,96,202 'schema':196 'scheme':107 'servic':72 'settl':80 'sign':117 'sinc':129 'sourc':211 'spars':161 'spec':185 'specif':88 'stablecoin price' 'suit':55 'technic':179 'token':5,20 'token price feed' 'token-price-lookup' 'unit':126 'unknown':218 'updat':212 'usdc':4,19,40,82,118,130 'usdc-payment' 'use':131 'util':71 'via':7,22,41,101 'wallet':174 'x':112 'x-payment':111 'x402':8,23,47,103 'x402 price API' 'x402-micropayment'","prices":[{"id":"6b12efd9-6910-4ba0-8853-0840132de055","listingId":"9ace43cb-4fcd-4ff9-8040-d8ed075d453f","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/USDC/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":"2026-04-18T18:57:19.511Z"}],"sources":[{"listingId":"9ace43cb-4fcd-4ff9-8040-d8ed075d453f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/USDC/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:19.511Z","lastSeenAt":"2026-04-23T20:03:03.009Z"}],"details":{"listingId":"9ace43cb-4fcd-4ff9-8040-d8ed075d453f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/USDC/price \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/USDC/price"},{"claim":"All APIs priced at $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/USDC/price"}],"useCases":["Fetching the current USDC price in an automated trading or DeFi workflow","Agents that need real-time token pricing without managing API keys","Pay-per-call price checks from smart-contract or bot pipelines"],"bestFor":["AI agents needing keyless, on-demand token price data","Developers prototyping x402 micropayment integrations","Low-volume, pay-as-you-go crypto price lookups"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed historical price data or OHLCV candles (not described)","Anyone needing comprehensive documentation or guaranteed uptime SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.193Z"},"updatedAt":"2026-04-23T20:03:03.009Z"}}