x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides an account balance lookup via the x402 payment protocol. The specific resource `/api/v1/accounts/34/balance` is described as "Premium API Access" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/accounts/34/balance` endpoint actually returns. The endpoint is confirmed live (returns a valid x402 402 challenge), but the lack of documentation makes it difficult to determine the exact request format or response structure.
Capabilities
Use cases
- —Querying account balance data via a single paid API call
- —Integrating pay-per-call balance lookups into agent workflows
- —Accessing premium data without API key registration
Fit
Best for
- —Agents that can settle x402 payments in USDC on Base
- —Use cases requiring no-signup, pay-per-call API access
- —Low-volume or sporadic balance queries where subscription pricing is wasteful
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who would benefit from bulk or subscription pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/34/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the purpose of the specific /accounts/34/balance resource is unclear. The listing is effectively a stub.
Warnings
- —No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The specific endpoint /api/v1/accounts/34/balance has a hardcoded account ID (34); unclear if this is parameterizable
- —Purpose and response format of the balance endpoint are unknown
Citations
- —Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000https://lowpaymentfee.com/api/v1/accounts/34/balance
- —All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/34/balance