x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides a premium API access point for retrieving account balance information (specifically account 77). It is part of a broader platform that offers a variety of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/77/balance` accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a valid payment proof. The challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and did not yield substantive content during crawl, so the exact response schema and detailed usage instructions are unknown. The endpoint is live and returning a proper 402 challenge.
Capabilities
Use cases
- —Retrieving account balance data with per-request USDC micropayments
- —Integrating pay-per-call balance checks into agent workflows
- —Accessing financial account information without API key registration
Fit
Best for
- —Agents or services that need on-demand account balance lookups without subscription commitments
- —Developers experimenting with x402 payment-gated APIs on Base
- —Workflows requiring low-cost, keyless API access
Not for
- —High-volume balance polling where per-request costs would accumulate significantly
- —Users who need detailed documentation or guaranteed SLAs before integration
- —Non-crypto-native callers who cannot produce x402 payment headers
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/77/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no response examples, and all documentation pages returned only a 'Connect wallet' prompt with no usable content. The purpose of 'account 77 balance' is opaque — it is unclear what account system this refers to.
Warnings
- —Documentation pages (/docs, /pricing, /README) all returned only 'Connect wallet' with no substantive content
- —No OpenAPI or response schema available — the response format is entirely unknown
- —The meaning of 'accounts/77/balance' is unclear; it is unknown what account system or data source is being queried
- —The broader platform lists many endpoint categories (AI, analytics, finance, utils) all at $0.02, but none were probed for liveness beyond this one
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/77/balance
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/77/balance