Pay-per-call premium API access on Base 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. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/transactions/294` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a payment of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which is 6 decimals → $0.02) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The payment timeout is 300 seconds.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/294` endpoint actually returns or what input it expects beyond being a POST endpoint. The platform advertises many endpoints but provides no technical documentation for any of them.
Capabilities
Use cases
- —Accessing premium transaction data with per-call USDC micropayments
- —Integrating pay-as-you-go API calls without API key management
- —Agent-driven API consumption with on-chain payment settlement
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer no subscription commitments
Not for
- —Users needing detailed API documentation or schemas before integration
- —High-volume use cases where per-call pricing may add up without bulk discounts
- —Users without USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/294
# Returns 402 with x402 challenge; include X-PAYMENT header with valid payment proof to access.Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what the endpoint actually does, what inputs it expects, or what it returns. No OpenAPI 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 or input/output schema provided
- —Purpose of /api/v1/transactions/294 is unclear — 'Premium API Access' is generic
- —Cannot verify what data or service is actually delivered after payment
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/294
- —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/transactions/294