Check APT wallet balances via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns Aptos (APT) wallet balance data, gated behind an x402 payment challenge. The provider operates a broad suite of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/wallet/APT/balance` appears to be a crypto wallet balance lookup for the Aptos token. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what parameters the endpoint accepts or what shape the response takes. The endpoint is confirmed live via the 402 challenge, but the actual functionality and response format must be inferred from the URL path alone.
Capabilities
Use cases
- —Querying the balance of an Aptos (APT) wallet address programmatically
- —Building portfolio trackers that need on-demand APT balance lookups
- —Agents that need to verify APT holdings before executing downstream logic
Fit
Best for
- —Developers needing simple pay-per-call APT balance checks without API key management
- —AI agents with x402-compatible wallets on Base
- —Low-volume or sporadic crypto balance queries where subscription pricing is wasteful
Not for
- —High-frequency balance polling where $0.02/request adds up quickly
- —Users who need detailed transaction history or multi-token balance in a single call
- —Anyone without a Base-network USDC wallet for x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/APT/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{"address": "0x1..."}'Example
Request
{
"address": "0x1a2b3c4d5e6f..."
}Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of accepted parameters or response format. The request example and endpoint purpose are inferred solely from the URL path.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content
- —No OpenAPI or JSON schema describing request parameters or response shape
- —Request body format and required fields are unknown — the example request is speculative
- —The specific /api/v1/wallet/APT/balance endpoint is not listed on the provider's homepage among their advertised APIs
- —Response format is completely unknown
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wallet/APT/balance
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wallet/APT/balance
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com