x402-gated backup API on Base, pay $0.02 per request in USDC with no API keys required.
What it does
The `/api/v1/backup` endpoint at lowpaymentfee.com is one of many x402-protocol endpoints offered by this provider. It accepts POST requests and is gated behind an x402 payment challenge, settling in USDC on the Base network. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
The provider's site advertises a broad suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. The specific functionality of the `/api/v1/backup` endpoint is not documented beyond the label "Premium API Access." There are no API keys, no rate limits, and no sign-up required; payment is handled per-request via the x402 protocol.
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 endpoint actually returns or what input it expects. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to assess actual utility.
Capabilities
Use cases
- —Triggering a data backup operation via a single paid POST request
- —Integrating pay-per-use backup functionality into agent workflows
- —Using x402 protocol to access backup services without API key management
Fit
Best for
- —Agents or developers wanting no-signup, pay-per-call backup access
- —x402-native workflows on the Base network
- —Low-volume, on-demand backup operations
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —High-volume backup workloads where per-request pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
# The endpoint returns 402 with an x402 challenge.
# Use an x402-compatible client to pay $0.02 USDC on Base per request.
curl -X POST https://lowpaymentfee.com/api/v1/backup \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the backup endpoint actually does, no request/response schema, and no examples. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation exists for the /api/v1/backup endpoint — its actual functionality is unknown
- —All doc pages (docs, pricing, README, API) render only 'Connect wallet' with no content
- —No OpenAPI schema or request/response examples are available
- —The term 'backup' is not explained — unclear whether this backs up user data, system state, or something else
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/backup
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/backup