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 specified account (account ID 42 in the probed URL). It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs — all gated behind x402 micropayments on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed USDC payment on Base. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. The platform advertises a flat $0.02/request price across all endpoints, with no API keys, no rate limits, and no minimum commitments.
Documentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual response format after successful payment is unknown.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating pay-per-call balance lookups into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents needing on-demand account balance data without subscription commitments
- —Projects requiring keyless, pay-per-use API access on Base
Not for
- —Users who need detailed API documentation or response schema guarantees before integrating
- —High-volume balance queries where per-request pricing may add up compared to subscription models
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/42/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no example payloads. The actual functionality behind 'account balance' is unverifiable.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific purpose and data returned by the /accounts/42/balance endpoint cannot be verified from available materials
- —No request body schema documented; unclear what parameters (if any) the POST body accepts
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/accounts/42/balance
- —Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/accounts/42/balance