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/24/balance` is gated behind a per-request USDC payment on the Base network. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD) per request, consistent with the provider's advertised flat $0.02/request pricing across all their API endpoints.
The provider, lowpaymentfee.com, hosts a broader suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments required — payment is handled entirely via the x402 protocol using USDC on Base.
This particular endpoint appears to return account balance information in JSON format. 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 fields the balance response contains or what parameters the POST request accepts. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to use without experimentation.
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 services that need on-demand account balance checks without subscription commitments
- —Developers exploring x402 protocol integrations on Base
- —Use cases requiring keyless, pay-per-call API access
Not for
- —Production systems requiring well-documented, schema-validated APIs
- —High-volume balance polling where per-request fees would accumulate significantly
- —Users who need detailed API documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/24/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' with no content. There is no OpenAPI schema, no request/response examples, and no description of what this specific balance endpoint returns or accepts. The endpoint's purpose ('Premium API Access' for account 24 balance) is vague.
Warnings
- —Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content
- —No OpenAPI or schema available — request parameters and response format are unknown
- —The endpoint path references a hardcoded account ID (24); unclear if this is parameterizable
- —No request or response examples available anywhere in crawled content
- —The broader API suite advertises many endpoints (AI, finance, utils) but none have documented schemas
Citations
- —The x402 challenge requires a maximum of 20,000 base units of USDC ($0.02) per request on Base networkhttps://lowpaymentfee.com/api/v1/accounts/24/balance
- —The provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/24/balance
- —Documentation, API, pricing, and README pages all show only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs