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 categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/transactions/306` is listed under the generic "Premium API Access" description. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, and charges a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The 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 technical detail. There is no OpenAPI spec, no request/response schema, and no description of what data this particular transactions endpoint returns. The platform advertises many endpoints but provides no public documentation on input parameters or response formats.
Capabilities
Use cases
- —Accessing premium transaction data without subscription or API key management
- —Programmatic pay-per-use API calls settled in USDC on Base
- —Agent-driven workflows requiring on-demand paid endpoints
Fit
Best for
- —Developers wanting zero-commitment pay-per-call access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation before integrating
- —High-volume use cases where per-request pricing is inefficient
- —Developers without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/306 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this endpoint actually does, no input/output schema, no examples, and the docs pages are empty. The listing is effectively a stub.
Warnings
- —No documentation available — docs/API/pricing/README pages all show only 'Connect wallet'
- —No OpenAPI spec or request/response schema provided
- —Purpose of /api/v1/transactions/306 is unclear — 'Premium API Access' is generic
- —Cannot verify what data or functionality this endpoint actually provides
Citations
- —Endpoint returns 402 with x402 challenge accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/306
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/306