BTC liquidity data via x402 micropayment on Base — $0.02 per request, no API keys needed.
What it does
This endpoint at lowpaymentfee.com provides BTC liquidity data as part of a broader DeFi/finance API suite. It is gated by the x402 payment protocol: callers pay $0.02 per request in USDC on the Base network. No API keys, accounts, or rate limits are required — access is granted immediately upon payment.
The specific endpoint `/api/v1/defi/BTC/liquidity` sits within the Finance & Web3 category of the provider's offerings, which also includes price feeds, exchange rates, token quotes, and gas estimates. The x402 challenge confirms the endpoint is live, accepting POST requests, and settling payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the liquidity response contains. The endpoint name and category suggest it returns BTC liquidity metrics relevant to DeFi (e.g., pool depths, available liquidity across venues), but this is inferred from the URL path alone and cannot be confirmed from available material.
Capabilities
Use cases
- —Querying real-time BTC liquidity across DeFi venues before executing trades
- —Monitoring Bitcoin liquidity conditions for automated trading bots
- —Integrating BTC liquidity data into portfolio dashboards without managing API keys
Fit
Best for
- —Agents or bots that need on-demand BTC liquidity data without account setup
- —Developers building DeFi tools who prefer pay-per-call pricing
- —Crypto traders wanting programmatic access to liquidity metrics
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing rather than per-call payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/defi/BTC/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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect stub. The actual data returned by this endpoint is entirely unknown, making this effectively a stub listing.
Warnings
- —No documentation available — all doc pages return only a 'Connect wallet' prompt with no content.
- —No request or response schema provided; the data returned by this endpoint is unknown.
- —Endpoint purpose (BTC liquidity) is inferred solely from the URL path; no provider description confirms this.
- —The provider hosts many endpoints across unrelated categories (AI, geocoding, finance) all at $0.02, which may indicate a template/demo site rather than a production service.
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/defi/BTC/liquidity
- —Price is $0.02 per request (maxAmountRequired 20000 in USDC base units, 6 decimals)https://lowpaymentfee.com/api/v1/defi/BTC/liquidity
- —No API keys, no rate limits, instant access advertisedhttps://lowpaymentfee.com
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/defi/BTC/liquidity
- —Provider lists Finance & Web3 endpoints including price feeds, exchange rates, token quotes, and gas estimateshttps://lowpaymentfee.com