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 on the Base network. The specific endpoint `/api/v1/transactions/147` accepts POST requests and charges 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 per request given USDC's 6 decimals.
The broader lowpaymentfee.com platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
The specific functionality of the `/api/v1/transactions/147` endpoint is unclear — it is listed as "Premium API Access" without further documentation about what data or service it returns. The docs, pricing, and API pages on the site only show a "Connect wallet" prompt with no additional technical documentation. The endpoint is confirmed live via a valid 402 challenge response, settling payments in USDC on Base with a 300-second timeout.
Capabilities
Use cases
- —Accessing premium API services without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Integrating pay-per-use endpoints into agent workflows without subscriptions
Fit
Best for
- —Developers who want instant API access without signup
- —Agents that can settle x402 payments autonomously on Base
- —Users preferring crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation before purchasing
- —High-volume use cases where per-request pricing may add up
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/147 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge, but there is no documentation about what the endpoint actually returns, no request/response schema, and the docs pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/transactions/147 is unknown.
Warnings
- —No documentation available — docs, pricing, and API pages only show 'Connect wallet'
- —The specific functionality of /api/v1/transactions/147 is undocumented
- —No request or response schema provided
- —No OpenAPI spec or AI plugin manifest available
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/transactions/147
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/transactions/147