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/41` is labeled "Premium API Access" but its exact functionality is not documented beyond that title. 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 is ambiguous and may require experimentation to determine its output.
Capabilities
Use cases
- —Accessing premium data or services with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base L2
- —Use cases requiring keyless, pay-as-you-go API access
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring free or fiat-only payment methods
- —Production workloads that depend on well-documented response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/41 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, the actual functionality behind "Premium API Access" is undocumented — docs pages render only a wallet-connect prompt, there is no OpenAPI spec, no response schema, and no example payloads. The listing is essentially a stub with confirmed liveness.
Warnings
- —The exact functionality of /api/v1/payments/41 ('Premium API Access') is not documented anywhere in the crawled material.
- —All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no substantive content.
- —No OpenAPI spec, response schema, or example responses are available.
- —The endpoint's purpose may differ from the other listed endpoints; treat with caution.
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/payments/41
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, maxAmountRequired 20000 base units = $0.02https://lowpaymentfee.com/api/v1/payments/41
- —Provider lists 16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com