Crypto market quote for CAT token via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides a market quote for the CAT token. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints are gated by the x402 protocol, requiring a per-call USDC micropayment on the Base network.
The specific endpoint `/api/v1/market/quote/CAT` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys are required; payment is handled entirely via the X-PAYMENT header. The provider advertises no rate limits and instant access.
Documentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the CAT quote response contains. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual response schema and supported request parameters are unknown.
Capabilities
Use cases
- —Fetching a real-time market quote for the CAT token programmatically
- —Integrating CAT token pricing into a trading bot or portfolio tracker
- —Agent-driven price lookups without needing API key registration
Fit
Best for
- —Developers wanting keyless, pay-per-call crypto price data
- —AI agents that can settle x402 payments on Base
- —Quick one-off CAT token price checks without subscription commitments
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need detailed historical OHLCV data (no evidence this endpoint provides it)
- —Anyone unable to pay with USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/CAT \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request parameters, no example responses, and all documentation pages are empty beyond a wallet-connect prompt. The actual content of the CAT quote response is entirely unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages are all empty (wallet-connect only).
- —No OpenAPI or output schema provided; response format for the CAT quote is unknown.
- —The 'CAT' token identity is unspecified — it is unclear which project or asset this refers to.
- —No SLA, rate-limit, or uptime guarantees documented.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/market/quote/CAT
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/CAT