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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, settled in USDC on the Base network.
The specific endpoint `/api/v1/payments/112` is labeled "Premium API Access" in the x402 challenge. Its exact functionality beyond that label is not documented — the crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional detail. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.
Because the site provides no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the actual input parameters and response format for this specific endpoint are unknown. Agents should treat this as a low-cost experimental endpoint and verify behavior with a test call.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 payment-gated APIs
- —Agents needing instant, keyless API access with crypto micropayments
- —Low-volume or experimental use cases at $0.02/request
Not for
- —Users who need detailed API documentation or guaranteed SLAs before calling
- —High-volume production workloads where per-request crypto settlement adds latency
- —Users without USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/112 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/112 is unclear beyond the generic label 'Premium API Access'. All doc pages returned only 'Connect wallet' with no content.
Warnings
- —No documentation available — docs, pricing, README, and API pages all return only 'Connect wallet'
- —The specific functionality of /api/v1/payments/112 is undocumented; 'Premium API Access' is the only descriptor
- —No OpenAPI schema or request/response examples provided
- —No information on uptime, SLAs, or rate limits beyond marketing claims of 'no rate limits'
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/payments/112
- —All APIs priced at $0.02/request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/112
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/payments/112