Perpetual-swap liquidity data via x402 micropayment on Base, $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides DeFi perpetual-swap (PERP) liquidity data behind an x402 paywall. It accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). Payment is settled on-chain via the x402 "exact" scheme to a specified wallet address, with no API keys, rate limits, or subscriptions required.
The provider operates a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services — all priced at $0.02 per request. This specific endpoint sits in the Finance & Web3 category and focuses on perpetual-swap liquidity information, though the exact response schema and supported request parameters are not documented in the available material. The crawled docs, pricing, and README pages all rendered only a "Connect wallet" prompt with no further technical documentation.
Because no OpenAPI spec, request/response schema, or usage examples are available, the precise fields accepted in the POST body and the structure of the returned liquidity data remain unknown. Agents should expect a JSON response (the x402 challenge declares mimeType "application/json") but will need to experiment or contact the provider for detailed field-level documentation.
Capabilities
Use cases
- —Querying real-time liquidity depth for perpetual-swap markets
- —Feeding DeFi liquidity metrics into trading bots or dashboards
- —Comparing perp liquidity across venues programmatically
Fit
Best for
- —Agents or bots that need on-demand DeFi liquidity snapshots without managing API keys
- —Developers building perp-trading tools who want pay-per-call pricing
- —Crypto analytics dashboards requiring liquidity data on Base
Not for
- —Users who need free or bulk-discounted high-frequency data feeds
- —Anyone requiring detailed API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/defi/PERP/liquidity \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual data returned is entirely undocumented.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no technical content.
- —Request body schema and response schema are completely unknown; no examples exist in crawled material.
- —The endpoint's specific data coverage (which perp markets, which DEXes) is not described anywhere.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/defi/PERP/liquidity
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/defi/PERP/liquidity
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com