{"id":"851eff3d-8ff5-4daf-a770-57106df1bef7","shortId":"pPcKaM","kind":"x402","title":"Real-time RSR token price data via x402 micropayment on Base for $0.02 per request.","tagline":"Real-time RSR token price data via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current price of the RSR (Reserve Rights) token. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, covering finance, crypto, AI/ML, data analytics, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/tokens/RSR/price` accepts POST requests and returns JSON. Each call costs a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required. The x402 challenge was confirmed live, returning a proper 402 response with payment parameters including the payTo address and USDC asset contract on Base.\n\nDocumentation beyond the landing page is sparse — the /docs, /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 appears to be one of many token price endpoints following a `/api/v1/tokens/{symbol}/price` pattern, though only the RSR variant is listed here.","tags":[],"capabilities":["token-price-lookup","x402-micropayment","usdc-settlement","base-network","pay-per-request","no-api-key","real-time-pricing"],"categories":["finance","crypto"],"synonyms":["RSR price","Reserve Rights price","token price API","crypto price feed","RSR market data","x402 price endpoint","micropayment API"],"warnings":["No OpenAPI or schema documentation available — response format is entirely unknown","All doc/pricing/README pages return only a wallet-connect prompt with no content","No example responses or field descriptions for the token price payload","Endpoint is part of a broad multi-category API suite; unclear how mature or reliable the finance data source is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/RSR/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/RSR/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no example request/response, and all documentation pages beyond the landing page are empty stubs. The response schema and exact request body format are 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'/api/v1/tokens/rsr/price':87 '/docs':162 '/price':210 '/pricing':163 '/readme':165 '0.02':14,30,110 '000':101 '20':100 '402':139 '6':106 'RSR market data' 'RSR price' 'Reserve Rights price' 'accept':88 'account':124 'addit':176 'address':147 'ai/ml':64 'analyt':66 'api':57,122 'appear':197 'asset':150 'base':12,28,82,102,153 'base-network' 'beyond':155 'broader':50 'call':56,95 'challeng':132 'confirm':134 'connect':171 'contract':151 'cost':96 'cover':61 'crypto':63 'crypto price feed' 'current':37 'data':7,23,65 'decim':107 'descript':190 'detail':178 'document':154 'endpoint':34,71,86,196,205 'equal':109 'exampl':185 'financ':62 'follow':206 'handl':113 'header':120 'host':58 'includ':144 'inlin':114 'json':93 'key':123 'land':157 'limit':127 'list':218 'live':135 'lowpaymentfee.com':60 'mani':202 'maximum':98 'micropay':10,26 'micropayment API' 'network':83 'no-api-key' 'one':200 'openapi':182 'page':158,166 'paramet':143 'part':47 'pattern':211 'pay':54 'pay-per-cal':53 'pay-per-request' 'payload':187 'payment':75,111,119,142 'payto':146 'per':15,31,55 'post':89 'price':6,22,38,204 'prompt':173 'proper':138 'protocol':76 'rate':126 'real':2,18 'real-tim':1,17 'real-time-pricing' 'render':168 'request':16,32,90 'request/response':186 'requir':129 'reserv':42 'respons':140,193 'return':35,92,136 'right':43 'rsr':4,20,41,215 'schema':194 'servic':69 'settl':77 'spars':160 'spec':183 'specif':85 'suit':51 'symbol':209 'technic':177 'though':212 'time':3,19 'token':5,21,44,203 'token price API' 'token-price-lookup' 'unit':103 'usdc':79,105,149 'usdc-settlement' 'use':72 'util':68 'variant':216 'via':8,24,115 'wallet':172 'x':118 'x-payment':117 'x402':9,25,74,131 'x402 price endpoint' 'x402-micropayment'","prices":[{"id":"cf958fac-0200-4ba0-b543-230ae32bb29f","listingId":"851eff3d-8ff5-4daf-a770-57106df1bef7","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/RSR/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":"2026-04-18T18:57:10.468Z"}],"sources":[{"listingId":"851eff3d-8ff5-4daf-a770-57106df1bef7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/RSR/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:10.468Z","lastSeenAt":"2026-04-23T21:32:34.361Z"}],"details":{"listingId":"851eff3d-8ff5-4daf-a770-57106df1bef7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/RSR/price \\\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 USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/RSR/price"},{"claim":"Maximum amount required is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/tokens/RSR/price"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/RSR/price"}],"useCases":["Fetching the current RSR token price for portfolio tracking or trading bots","Integrating real-time RSR pricing into a DeFi dashboard without managing API keys","Agent-driven price lookups where per-call micropayments replace subscription billing"],"bestFor":["Developers needing on-demand RSR price data without signup or API key management","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic price queries where $0.02/call is cheaper than a subscription"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing (no documented batch endpoint)","Users who need historical price data or OHLCV candles (only current price is indicated)","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.631Z"},"updatedAt":"2026-04-23T21:32:34.361Z"}}