Check BTC wallet balances via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns BTC wallet balance data, gated behind an x402 payment challenge. The endpoint accepts POST requests and charges $0.02 per call (20,000 base units of USDC on Base network, where USDC uses 6 decimals). Payment is settled on-chain via the x402 "exact" scheme to a specified payee address, with no API keys or rate limits required.
The provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request. This specific endpoint falls under the Finance & Web3 category. The x402 challenge confirms the endpoint is live and returns application/json responses. However, no detailed documentation, request/response schemas, or example payloads are available from the crawled pages (docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content).
Capabilities
Use cases
- —Querying BTC wallet balances programmatically from an agent or application
- —Building portfolio trackers that need on-demand Bitcoin balance lookups
- —Integrating BTC balance checks into payment verification workflows
Fit
Best for
- —Agents needing pay-per-call BTC balance data without API key management
- —Low-volume or sporadic Bitcoin balance queries where subscription pricing is wasteful
- —x402-native applications settling micropayments on Base
Not for
- —High-frequency bulk balance queries where $0.02/call adds up quickly
- —Users who need detailed BTC transaction history or UTXO-level data (not evidenced here)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/BTC/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing, network, and asset details. However, there is no documentation, no request/response schema, no examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The actual behavior of the endpoint (what input it expects, what fields it returns) is entirely unknown.
Warnings
- —No request or response schema available — input format and output fields are unknown
- —All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content
- —The endpoint's actual data source and accuracy for BTC balances are unverified
- —Provider hosts many endpoints across diverse categories; unclear if all are fully implemented or stubs
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000https://lowpaymentfee.com/api/v1/wallet/BTC/balance
- —All APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wallet/BTC/balance