x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides account balance information via the x402 payment protocol. The specific resource `/api/v1/accounts/121/balance` is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme to a specified wallet address, with the asset being USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access.
However, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the balance endpoint actually returns or what input parameters it expects. The endpoint path suggests it retrieves a balance for account ID 121, but the semantics are unclear.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Agent-driven financial data retrieval without API key management
- —Programmatic access to balance information settled on Base L2
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments in USDC on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume use cases where per-request pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/121/balance
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with valid USDC payment proof to receive the response.Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose of the specific account balance endpoint is unclear, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or JSON schema describing request parameters or response format
- —The specific endpoint path (/api/v1/accounts/121/balance) has a hardcoded account ID; unclear if this is parameterizable
- —The platform lists many endpoint categories (AI, analytics, finance, utils) but none have documented schemas
Citations
- —Endpoint returns 402 with x402 v1 challenge, accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/121/balance
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/121/balance
- —Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com