Coinbase market quote endpoint, pay-per-call via x402 on Base (USDC).
What it does
This x402-enabled endpoint at `/api/v1/market/quote/CB` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints are paid via the x402 protocol on the Base network using USDC, with no API keys, no rate limits, and no subscriptions required.
The specific endpoint probed (`/api/v1/market/quote/CB`) is labeled "Premium API Access" and accepts POST requests. Based on the URL path, it likely returns a market quote related to Coinbase ("CB"), though the exact response schema is not documented. The x402 challenge confirms the endpoint is live, charging a maximum of 0.02 USDC per request (20,000 base units with 6 decimals) settled on the Base network to the specified payTo address. The payment timeout is 300 seconds.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint's exact input parameters and output format remain unknown.
Capabilities
Use cases
- —Fetching real-time market quotes potentially related to Coinbase
- —Agent-driven crypto price lookups with per-call micropayments
- —Integrating pay-per-request market data into trading bots or dashboards
Fit
Best for
- —Agents needing on-demand market quotes without API key management
- —Developers wanting micropayment-gated crypto data on Base
- —Automated workflows requiring simple pay-per-call financial data
Not for
- —Users needing well-documented APIs with full request/response schemas
- —High-frequency trading requiring sub-second latency guarantees
- —Anyone who needs free or subscription-based access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/CB \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The endpoint's actual functionality (input parameters, output format) can only be guessed from the URL path. This is effectively a stub listing.
Warnings
- —No OpenAPI spec or schema available for request or response
- —Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no content
- —Exact functionality of /api/v1/market/quote/CB is inferred from URL path only — 'CB' may or may not refer to Coinbase
- —No example responses available to verify what data is returned
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/market/quote/CB
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com