x402-gated account balance endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides account balance information via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.
The specific endpoint `/api/v1/accounts/191/balance` is described as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through per-request payment.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge), but the actual data returned after payment is unknown. The platform lists many other endpoints at $0.02 each, but without documentation it is unclear what data any of them actually return or what input parameters they accept.
Capabilities
Use cases
- —Querying account balance data with per-request USDC micropayments
- —Integrating pay-per-call balance checks into agent workflows
- —Accessing financial data without API key registration
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —Agents that can settle x402 payments in USDC on Base
- —Prototyping micropayment-gated API integrations
Not for
- —Users needing detailed API documentation or response schemas before integrating
- —High-volume use cases where per-request pricing may add up without bulk discounts
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/191/balance \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (account 191 balance) is opaque, and the broader site's docs pages are empty. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No request or response schema provided; it is unknown what data this endpoint returns after payment
- —The endpoint path references a specific account ID (191), suggesting it may be a demo or placeholder
- —No OpenAPI or ai-plugin manifest discovered
Citations
- —The endpoint returns HTTP 402 with a valid x402 challenge advertising USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/191/balance
- —Maximum amount required is 20000 base units of USDC (6 decimals = $0.02)https://lowpaymentfee.com/api/v1/accounts/191/balance
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs