{"id":"a7b3a416-469f-4dea-b4bc-67afafc8c8bd","shortId":"3Mhfpp","kind":"x402","title":"Token data for RSR via x402 micropayment on Base — $0.02 per request, no API key needed.","tagline":"Token data for RSR via x402 micropayment on Base — $0.02 per request, no API key needed.","description":"This endpoint at lowpaymentfee.com provides token-level data for RSR (Reserve Rights) as part of a broader suite of finance, crypto, AI, and utility APIs. The entire platform operates on the x402 payment protocol, settling in USDC on the Base network. Each request costs $0.02 (20,000 base units of USDC with 6 decimals), and there are no API keys, rate limits, or subscription commitments — you pay per call via an X-PAYMENT header.\n\nThe specific endpoint `/api/v1/tokens/RSR` sits alongside other crypto and finance endpoints such as `/api/v1/crypto/quotes`, `/api/v1/finance/prices`, and `/api/v1/finance/rates`. Based on the URL pattern, it likely returns token-specific data for the RSR token (price, metadata, or market information), though the exact response schema is not documented. The platform also offers AI/ML endpoints (sentiment analysis, summarization, classification, embeddings), data analytics, and utility services, all at the same $0.02 per-request price point.\n\nThe endpoint is confirmed live, returning a proper 402 challenge with x402 version 1. Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. Documentation beyond the landing page is essentially empty (docs, pricing, and API pages all just show a \"Connect wallet\" prompt), so the exact request/response format must be inferred.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","token-data","crypto-market-data","per-request-pricing","no-api-key","no-rate-limit"],"categories":["finance","crypto"],"synonyms":["RSR token data","Reserve Rights API","crypto token price","token quote","x402 crypto API","micropayment API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all render only a 'Connect wallet' prompt with no content.","No OpenAPI or output schema provided; request and response formats are entirely undocumented.","The specific data returned by /api/v1/tokens/RSR is inferred from URL pattern only; actual response structure is unknown.","This endpoint is not listed on the provider's landing page (which shows /api/v1/crypto/quotes but not /api/v1/tokens/RSR), so it may be an unlisted or experimental route."],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/RSR","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","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 documentation of request parameters, response schema, or example payloads — the docs/pricing/API pages are all blank beyond a wallet-connect prompt. The exact data returned for the RSR token endpoint is 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'/api/v1/finance/prices':123 '/api/v1/finance/rates':125 '/api/v1/tokens/rsr':112 '0.02':10,26,78,175 '000':80 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':200 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':203 '1':194 '20':79 '402':189 '6':86 'Base USDC API' 'RSR token data' 'Reserve Rights API' 'address':199 'ai':55 'ai/ml':159 'alongsid':114 'also':157 'analysi':162 'analyt':167 'api':14,30,58,92,217 'base':9,25,73,81,126,205 'beyond':207 'broader':50 'call':102 'challeng':190 'classif':164 'commit':98 'confirm':184 'connect':223 'cost':77 'crypto':54,116 'crypto token price' 'crypto-market-data' 'data':2,18,41,137,166 'decim':87 'doc':214 'document':154,206 'embed':165 'empti':213 'endpoint':34,111,119,160,182 'entir':60 'essenti':212 'exact':149,228 'financ':53,118 'format':230 'header':108 'infer':233 'inform':146 'key':15,31,93 'land':209 'level':40 'like':132 'limit':95 'live':185 'lowpaymentfee' 'lowpaymentfee.com':36 'market':145 'metadata':143 'micropay':7,23 'micropayment API' 'must':231 'need':16,32 'network':74 'no-api-key' 'no-rate-limit' 'offer':158 'oper':62 'page':210,218 'part':47 'pattern':130 'pay':100 'payment':66,107,195 'per':11,27,101,177 'per-request':176 'per-request-pricing' 'platform':61,156 'point':180 'price':142,179,215 'prompt':225 'proper':188 'protocol':67 'provid':37 'rate':94 'request':12,28,76,178 'request/response':229 'reserv':44 'respons':150 'return':133,186 'right':45 'rsr':4,20,43,140 'schema':151 'sentiment':161 'servic':170 'settl':68,197 'show':221 'sit':113 'specif':110,136 'subscript':97 'suit':51 'summar':163 'though':147 'token':1,17,39,135,141 'token quote' 'token-data' 'token-level':38 'token-specif':134 'unit':82 'url':129 'usdc':70,84,202 'usdc-base-settlement' 'use':201 'util':57,169 'version':193 'via':5,21,103 'wallet':224 'x':106 'x-payment':105 'x402':6,22,65,192 'x402 crypto API' 'x402-payment'","prices":[{"id":"7c762bd2-33f6-49a2-8e93-e1f6d3338efc","listingId":"a7b3a416-469f-4dea-b4bc-67afafc8c8bd","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:11.076Z"}],"sources":[{"listingId":"a7b3a416-469f-4dea-b4bc-67afafc8c8bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/RSR","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:11.076Z","lastSeenAt":"2026-04-23T21:32:34.395Z"}],"details":{"listingId":"a7b3a416-469f-4dea-b4bc-67afafc8c8bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/RSR \\\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 a 402 challenge with x402 version 1, accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/tokens/RSR"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/RSR"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists crypto endpoints like /api/v1/crypto/quotes and /api/v1/finance/prices but does not list /api/v1/tokens/RSR","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current RSR token data (price, metadata) for portfolio tracking","Programmatic access to RSR market information for trading bots","Agent-driven crypto data retrieval with per-call micropayments","Integrating RSR token info into dashboards without managing API keys"],"bestFor":["Agents or bots that need on-demand RSR token data without subscription overhead","Developers who want keyless, pay-per-use crypto data endpoints","x402-compatible clients settling micropayments in USDC on Base"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing comprehensive historical token data or OHLCV candles (not documented)","Anyone without a Base-compatible USDC wallet for x402 payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:47.584Z"},"updatedAt":"2026-04-23T21:32:34.395Z"}}