USDC liquidity data for DeFi on Base, paid per-call via x402 at $0.02.
What it does
This endpoint at lowpaymentfee.com provides USDC liquidity data as part of a broader DeFi and finance API suite. It is accessed via HTTP POST and gated by the x402 payment protocol on the Base network. Each call costs up to $0.02 (20,000 base units of USDC with 6 decimals) and settles on-chain to a specified wallet address. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The provider's landing page lists this endpoint under a "Finance & Web3" category alongside price feeds, exchange rates, token quotes, and gas estimates. The specific endpoint path (`/api/v1/defi/USDC/liquidity`) suggests it returns liquidity-related metrics for USDC, though the exact response schema is not documented in the crawled material. The site advertises a uniform $0.02-per-request pricing model across all endpoints, with no minimums or commitments.
Documentation is extremely thin — the /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no example request/response, and no description of what fields the liquidity endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to assess the quality or structure of the data returned.
Capabilities
Use cases
- —Querying real-time USDC liquidity metrics for DeFi applications
- —Monitoring USDC pool depth or availability programmatically
- —Integrating USDC liquidity data into trading bots or dashboards
Fit
Best for
- —Developers building DeFi tools on Base who need USDC liquidity data
- —Agents that can pay per-call via x402 without managing API keys
- —Quick, low-cost lookups of USDC liquidity without subscription commitments
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —Applications requiring historical liquidity data (no evidence of historical support)
- —Non-crypto projects with no x402 payment capability
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/defi/USDC/liquidity \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no response schema, no example requests or responses, and all documentation pages are empty stubs. The actual data returned by the liquidity endpoint is entirely unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt
- —No OpenAPI or output schema describing what the liquidity endpoint returns
- —The specific endpoint /api/v1/defi/USDC/liquidity is not listed on the landing page; only broader Finance & Web3 endpoints are shown
- —Cannot verify data quality or completeness without example responses
Citations
- —Endpoint returns HTTP 402 with x402 challenge on Base network, accepting USDC at maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/defi/USDC/liquidity
- —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/defi/USDC/liquidity