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 provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/7` is labeled "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 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.
The provider's landing page lists 16 endpoints across four categories but provides minimal documentation — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. Without detailed documentation or response schemas, the actual data returned by this specific endpoint remains unclear. Agents should be aware that the endpoint's purpose and response format are not well-documented.
Capabilities
Use cases
- —Programmatic access to premium API functionality with per-request USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API access on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment flows
- —AI agents that can settle USDC payments on Base
- —Use cases requiring no-signup, no-rate-limit API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-crypto payment methods
- —Anyone needing clarity on what data this specific endpoint returns
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation about what this specific endpoint does or what it returns. The docs, pricing, API, and README pages are all empty beyond a wallet-connect prompt. The label 'Premium API Access' is generic and uninformative.
Warnings
- —The exact functionality and response schema of /api/v1/payments/7 are undocumented — 'Premium API Access' is the only description available.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, no response examples, and no input schema are provided.
- —The endpoint's relationship to the other 16 listed endpoints is unclear.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base network with USDC paymenthttps://lowpaymentfee.com/api/v1/payments/7
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/7
- —Provider lists 16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com