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 on the platform, which offers a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities—all priced at $0.02 per request settled in USDC on the Base network.
The specific endpoint `/api/v1/transactions/318` accepts POST requests and requires an X-PAYMENT header containing a valid x402 payment proof. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises no API keys, no rate limits, and instant access.
Note that while the platform lists many endpoints (sentiment analysis, summarization, price feeds, geocoding, etc.), the specific functionality of `/api/v1/transactions/318` is not documented beyond the generic label "Premium API Access." There is no OpenAPI schema, no detailed documentation, and no example responses available from the crawled pages. The docs, pricing, and API pages all appear to require wallet connection and provide no additional content.
Capabilities
Use cases
- —Accessing premium API services without traditional API key registration
- —Making one-off paid API calls settled instantly in USDC on Base
- —Agent-driven workflows requiring permissionless pay-per-use endpoints
Fit
Best for
- —Developers wanting keyless, pay-per-request API access
- —AI agents that can autonomously pay for API calls via x402
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed documentation or guaranteed SLAs
- —Applications requiring free or subscription-based pricing models
- —Users without access to USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transactions/318 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via 402 challenge with clear pricing ($0.02 USDC on Base), but there is no documentation of what the endpoint actually returns, no OpenAPI schema, no example requests/responses, and the specific purpose of '/api/v1/transactions/318' is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No documentation available for this specific endpoint's functionality or response format
- —Docs, pricing, and API pages require wallet connection and show no content
- —The purpose of /api/v1/transactions/318 is not explained—it may be a generic or placeholder endpoint
- —No OpenAPI schema or output schema details provided
Citations
- —Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/transactions/318
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/transactions/318