x402-gated backup endpoint on Base, pay-per-call with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" resource at the path `/api/v1/backups/20`. It is part of a broader platform offering dozens of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific `/api/v1/backups/20` endpoint accepts POST requests and returns `application/json`. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header with a valid payment proof. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.
Documentation beyond the landing page is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. The exact behavior and response schema of the `/api/v1/backups/20` endpoint are not documented, so the nature of the "backup" data it returns is unknown. The endpoint is confirmed live (returns a proper 402 x402 challenge).
Capabilities
Use cases
- —Retrieving backup data via a single micropayment without subscription
- —Agent-driven data access with per-call USDC settlement on Base
- —Programmatic access to backup resources with no authentication overhead
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents with x402-compatible payment capabilities
- —Users who prefer crypto micropayments over traditional API subscriptions
Not for
- —Users needing detailed documentation or guaranteed SLAs
- —Anyone without USDC on the Base network
- —High-volume batch operations where per-call pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/20 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of request/response schemas, no examples, and the purpose of the 'backups/20' resource is entirely undocumented. Docs pages return only 'Connect wallet' with no content.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —The exact purpose and response format of /api/v1/backups/20 is unknown
- —No OpenAPI spec or output schema provided beyond basic HTTP method info
- —The 'backups' resource name is ambiguous — unclear what data is returned
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/backups/20
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backups/20