x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request API behind the x402 payment protocol. The specific resource `/api/v1/backups/43` is labeled "Premium API Access" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The broader lowpaymentfee.com platform offers a suite of endpoints spanning 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payments are made via the x402 protocol using USDC on the Base L2 network.
The specific `/api/v1/backups/43` endpoint's purpose is not well-documented — the name suggests a backup or data retrieval resource, but no schema or documentation describes the request body format or response structure. The docs, pricing, and API pages on the site only render a "Connect wallet" prompt with no additional technical detail. Without an OpenAPI spec or response examples, the exact functionality of this particular endpoint remains unclear.
Capabilities
Use cases
- —Retrieving backup data or stored resources via a single paid API call
- —Programmatic access to premium content without API key management
- —Agent-driven data retrieval with automatic micropayment settlement
Fit
Best for
- —Developers wanting key-free, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users needing low-cost per-request data access without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume batch operations where per-request pricing may add up
- —Anyone requiring non-USDC or non-Base payment settlement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/43 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, and the specific purpose of /api/v1/backups/43 is unclear. The site's docs pages render only a wallet-connect prompt with no technical content.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The purpose of /api/v1/backups/43 is not explained anywhere in the crawled content
- —Docs, pricing, and API pages only show 'Connect wallet' with no technical details
- —Request body format and response structure are entirely unknown
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base networkhttps://lowpaymentfee.com/api/v1/backups/43
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/backups/43