Pay-per-call premium API access on Base network via x402 protocol at $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/141` is listed under the generic "Premium API Access" label. The x402 challenge confirms it accepts POST requests, settles in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is directed 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 schema, no request/response examples, and no description of what this particular transactions endpoint actually returns. The platform advertises a broad suite of endpoints but provides minimal documentation for any of them.
Capabilities
Use cases
- —Accessing premium data or services without API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows requiring permissionless pay-per-use endpoints
Fit
Best for
- —Developers wanting zero-signup API access with crypto payments
- —AI agents that can autonomously pay for API calls via x402
- —Users who prefer per-request billing over subscriptions
Not for
- —Users needing detailed API documentation or schemas before integration
- —Applications requiring fiat-only payment methods
- —High-volume use cases where per-request pricing may not be economical compared to bulk plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/141 \
-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 no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the generic label 'Premium API Access'. This is effectively a stub listing.
Warnings
- —No documentation available — docs/pricing/README pages only show 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —The specific function of /api/v1/transactions/141 is unknown — 'Premium API Access' is a generic label
- —Cannot verify what data or service is returned after payment
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/141
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/141