x402-gated account balance endpoint on Base, pay-per-call with USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" resource at `/api/v1/accounts/125/balance`, gated behind the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request on the Base network.
The specific endpoint probed (`/api/v1/accounts/125/balance`) appears to return account balance information, though the exact response schema is undocumented. The crawled docs, pricing, and README pages were effectively empty (showing only a "Connect wallet" prompt), so detailed request/response schemas and usage examples are unavailable. The endpoint is confirmed live via a valid 402 challenge.
Capabilities
Use cases
- —Querying account balance data with per-call USDC micropayments
- —Integrating x402-gated balance checks into agent workflows
- —Accessing financial account information without API key management
Fit
Best for
- —Agents or services that can settle x402 payments on Base
- —Use cases needing pay-per-call access without subscription commitments
- —Developers experimenting with x402 protocol integrations
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume use cases where per-call pricing may be inefficient compared to bulk plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/accounts/125/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially absent — the docs, pricing, and README pages all render only a wallet-connect prompt. No request/response schema, no usage examples, and the specific purpose of the /accounts/125/balance path is only inferrable from its URL. This is effectively a stub listing.
Warnings
- —No API documentation available; docs/pricing/README pages show only 'Connect wallet' prompt
- —Response schema for /api/v1/accounts/125/balance is completely undocumented
- —The endpoint path includes a hardcoded account ID (125), suggesting it may be a demo or single-account resource
- —No OpenAPI spec or ai-plugin manifest found
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/accounts/125/balance
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/125/balance
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com