Query GRT wallet balance on Base via x402 micropayment — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com returns the wallet balance for the GRT (The Graph) token. It is part of a broader suite of pay-per-call APIs offered by the provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are gated behind the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint `/api/v1/wallet/GRT/balance` accepts POST requests and returns JSON. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made via the "exact" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint is confirmed live (402 challenge captured), but the actual response format for a successful paid call is unknown.
Capabilities
Use cases
- —Check GRT token balance for a given wallet address
- —Monitor The Graph token holdings programmatically
- —Integrate GRT balance lookups into trading bots or portfolio dashboards
Fit
Best for
- —Agents needing on-demand GRT balance queries without API key management
- —Developers building crypto portfolio trackers
- —Automated workflows that need pay-per-call wallet balance checks
Not for
- —Bulk historical balance queries (no batch or historical endpoint documented)
- —Users who need detailed documentation or OpenAPI specs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wallet/GRT/balance \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and no OpenAPI spec. The actual behavior after payment is entirely unknown from available material.
Warnings
- —No OpenAPI or schema documentation available — request body and response format are unknown
- —All non-homepage pages (docs, API, pricing, README) render only 'Connect wallet' with no content
- —Cannot confirm what request body fields are expected or what the response looks like after successful payment
- —The provider lists many diverse API categories (AI, analytics, finance, infrastructure) at a uniform $0.02 price with no visible documentation, which may indicate an early-stage or placeholder service
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/wallet/GRT/balance
- —The provider advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wallet/GRT/balance