x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC with no API keys.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific path `/api/v1/backups/38` suggests a data backup or retrieval service, though the exact response payload is not documented beyond a generic "application/json" MIME type.
The provider operates a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per call (20,000 base units of USDC on Base, which has 6 decimals = $0.02). Payment is handled entirely via the x402 protocol: callers attach an `X-PAYMENT` header with a signed payment proof; no API keys, accounts, or rate limits are required. The payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.
Documentation is extremely sparse—the docs, pricing, and API pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of what the `/backups/38` resource actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation the actual utility is unclear.
Capabilities
Use cases
- —Retrieving backup data on-demand without managing API credentials
- —Programmatic access to stored resources via micropayment
- —Agent-driven data retrieval where per-call billing is preferred over subscriptions
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can sign x402 payment challenges autonomously
- —Users already holding USDC on Base who want frictionless API calls
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —High-volume batch workloads where per-request pricing becomes expensive
- —Users without Base-network USDC or x402-compatible wallets
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/38 \
-H "X-PAYMENT: <signed-x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no example payloads, and no explanation of what /backups/38 actually returns. The listing is effectively a stub with pricing and protocol details only.
Warnings
- —No documentation available—docs/pricing/API pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request body or response format
- —The specific resource '/backups/38' is not listed on the provider's homepage catalog
- —Actual content/utility of the backup endpoint is unknown
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/backups/38
- —Provider advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backups/38