x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.
What it does
This endpoint at lowpaymentfee.com provides access to a backup resource (`/api/v1/backups/2024-03`) behind an x402 payment wall. 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 via the x402 protocol.
The specific endpoint being listed here — `/api/v1/backups/2024-03` — is described only as "Premium API Access" and appears to serve a backup or archived dataset for March 2024. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the backup resource actually returns. The endpoint is confirmed live via the 402 challenge, but the actual payload and use case remain unclear.
Capabilities
Use cases
- —Retrieving archived or backup data for March 2024 via a single micropayment
- —Agent-driven data access without API key provisioning
- —Pay-per-call data retrieval settled on Base L2
Fit
Best for
- —Agents needing keyless, on-demand access to backup datasets
- —Developers experimenting with x402 micropayment flows
- —Scenarios where per-request billing is preferred over subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Bulk data retrieval where per-request pricing would be cost-inefficient
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/backups/2024-03 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the 'backups/2024-03' resource is entirely unexplained. The docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or schema describing request parameters or response format for this endpoint.
- —The purpose and contents of '/api/v1/backups/2024-03' are undocumented; 'Premium API Access' is the only description.
- —Cannot verify what data is actually returned without making a paid request.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units (0.02 USD).https://lowpaymentfee.com/api/v1/backups/2024-03
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.https://lowpaymentfee.com