x402-gated market quote endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a market quote API accessible via the x402 payment protocol. The specific path `/api/v1/market/quote/F` falls under the site's Finance & Web3 category, which includes price feeds, exchange rates, token quotes, and gas estimates. Payment is settled on the Base network using USDC (contract 0x8335…2913) at $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider site (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities, all priced uniformly at $0.02 per call. However, the specific endpoint probed here (`/api/v1/market/quote/F`) is not explicitly listed on the homepage — it may be an unlisted or variant route. The trailing `/F` in the path is unexplained in available documentation; it could represent a specific asset ticker or category filter, but this is unconfirmed.
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 crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation or sample responses, the exact input parameters and output format remain unknown.
Capabilities
Use cases
- —Fetching real-time market quotes for financial assets or tokens
- —Integrating pay-per-call market data into trading bots or agents
- —Accessing crypto price data without API key registration
Fit
Best for
- —AI agents needing on-demand market quotes with crypto micropayments
- —Developers who want keyless, pay-as-you-go financial data access
- —Applications already using x402 protocol on Base network
Not for
- —Users needing high-frequency bulk market data (no documented batch endpoints)
- —Anyone requiring detailed API documentation or guaranteed SLAs before integration
- —Non-crypto users who cannot settle payments in USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/F \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. The specific /market/quote/F path is not listed on the homepage. No request/response schema, no examples, and the meaning of the '/F' path segment is unknown. Score reflects a confirmed-live but undocumented stub.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.
- —The specific endpoint path /api/v1/market/quote/F is not listed among the provider's advertised APIs on the homepage.
- —The trailing '/F' in the path is unexplained; its meaning is unknown.
- —No request body schema or response schema is available; input/output format must be discovered by trial.
- —No OpenAPI specification or machine-readable API description found.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/market/quote/F
- —The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/market/quote/F
- —Finance & Web3 category includes Price Feeds, Exchange Rates, Token Quotes, and Gas Estimates endpoints.https://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompt with no API documentation.https://lowpaymentfee.com/docs