Pay-per-call market quote endpoint on Base via x402, settling in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/market/quote/C` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint appears to serve market quote data (likely crypto or financial asset quotes given the `/market/quote/C` path pattern and the site's Finance & Web3 category).
Payment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per request is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to receive the response.
Documentation 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 schema, no example request/response bodies, and no description of what the `C` parameter represents or what fields the response contains. The endpoint is confirmed live (returns 402 challenge correctly), but the lack of documentation makes integration speculative.
Capabilities
Use cases
- —Fetching real-time market quotes for a specific asset without subscription commitments
- —Integrating pay-per-call financial data into autonomous agent workflows
- —Accessing market pricing data with crypto-native payment rails
Fit
Best for
- —Agents or bots needing on-demand market quotes without API key management
- —Developers wanting to pay per request with USDC on Base
- —Low-volume or bursty access patterns where subscriptions are wasteful
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk pricing
- —Users who need comprehensive documentation and guaranteed SLAs
- —Non-crypto-native users who cannot settle payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/C \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no explanation of what 'C' refers to, and all documentation pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs/pricing/README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The meaning of the path parameter 'C' in /market/quote/C is undocumented
- —No example responses available to verify data quality or format
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/market/quote/C
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/C