API3 DeFi liquidity data via x402 micropayment on Base, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides DeFi liquidity data related to API3, accessible via the x402 payment protocol. It accepts POST requests and charges $0.02 per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). No API keys or rate limits are required — payment is handled inline via the x402 X-PAYMENT header.
The provider, lowpaymentfee.com, hosts a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request and settled in USDC on Base. This specific endpoint sits under the Finance & Web3 category and appears to serve API3 protocol liquidity information, though the exact response schema is not documented. The x402 challenge confirms the endpoint is live and returns a 402 Payment Required response with a valid payment challenge (x402Version 1, scheme "exact").
Documentation is extremely sparse — the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no example request/response, and no description of the data fields returned. The endpoint's purpose is inferred solely from its URL path (`/api/v1/defi/API3/liquidity`) and the provider's general site structure. Prospective users should expect to experiment with the endpoint to discover its actual response format.
Capabilities
Use cases
- —Querying real-time API3 protocol liquidity metrics for DeFi dashboards
- —Integrating API3 liquidity data into automated trading or analytics pipelines
- —Agent-driven DeFi research requiring per-call payment without API key management
Fit
Best for
- —Developers needing on-demand API3 liquidity data without subscription commitments
- —AI agents that can settle x402 micropayments on Base
- —DeFi analytics tools requiring low-cost, keyless API access
Not for
- —Users who need comprehensive API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/defi/API3/liquidity \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty. The endpoint's purpose is inferred only from its URL path. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.
- —No request or response schema documented; actual data fields are unknown.
- —Endpoint purpose inferred solely from URL path '/api/v1/defi/API3/liquidity' — actual functionality unverified.
- —The endpoint is not listed on the provider's homepage catalog, which may indicate it is experimental or unlisted.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/defi/API3/liquidity
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/defi/API3/liquidity