Check account balance via x402 micropayment on Base network for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns account balance information for a specific account (ID 129) behind an x402 paywall. It is part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/129/balance` accepts POST requests and is gated by the x402 protocol (version 1, scheme "exact"). The payment challenge requires up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual response format and the meaning of "account 129 balance" are unknown from the available material.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating pay-as-you-go balance lookups into agent workflows
- —Accessing financial account information without API key registration
Fit
Best for
- —Agents or apps that need on-demand account balance data without subscription commitments
- —Developers experimenting with x402 protocol micropayments on Base
- —Scenarios requiring keyless, instant API access paid in USDC
Not for
- —High-volume balance polling where per-request fees would accumulate quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/129/balance \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no explanation of what 'accounts/129/balance' actually returns. The listing is a stub with pricing and liveness confirmed but nothing else.
Warnings
- —No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —The specific meaning of 'accounts/129/balance' is unknown — it is unclear whether this is a demo, a user-specific resource, or a generic endpoint
- —No examples of successful responses are available
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/129/balance
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/129/balance