Real-time RSR token price data via x402 micropayment on Base for $0.02 per request.
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tokens/RSR/price \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
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 unknown.
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
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/tokens/RSR/price
- —Maximum amount required is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/tokens/RSR/price
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/tokens/RSR/price