Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility services — all priced at $0.02 per request settled in USDC on the Base network.
The specific endpoint `/api/v1/charges/341` accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
Documentation is extremely sparse. The crawled docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no description of what "Premium API Access" actually returns. The platform appears to be a demonstration or early-stage x402 marketplace rather than a fully documented production service.
Capabilities
Use cases
- —Demonstrating x402 payment protocol integration
- —Accessing pay-per-call services without API key management
- —Testing micropayment-gated endpoints on Base
Fit
Best for
- —Developers exploring x402 payment flows
- —Agents needing keyless, per-call API access
- —Projects wanting USDC-settled micropayments on Base
Not for
- —Users needing detailed API documentation or schemas
- —Production workloads requiring SLA guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/341 \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' actually delivers. Effectively a stub listing.
Warnings
- —No documentation available — docs/pricing/API pages only show 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Purpose of 'Premium API Access' at /api/v1/charges/341 is undefined
- —Platform may be a demo or early-stage project
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/341
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/341