x402basequality 0.30

x402-gated backup endpoint on Base, pay-per-request with USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/backups/25

What it does

This endpoint at lowpaymentfee.com provides a "Premium API Access" resource at the path /api/v1/backups/25. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.

The specific endpoint /api/v1/backups/25 returns an x402 challenge requesting payment of up to 20,000 base units of USDC (contract 0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made via the x402 "exact" scheme to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout.

The platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the "backups/25" resource actually returns. The endpoint accepts POST requests. Without further documentation it is unclear what request body (if any) is expected or what the response payload contains.

Capabilities

x402-paymentusdc-basepay-per-requestbackup-apipost-endpoint

Use cases

  • —Retrieving backup data via a micropayment-gated API call
  • —Programmatic access to backup resource #25 with per-request USDC payment
  • —Agent-driven data retrieval with no API key required

Fit

Best for

  • —Developers wanting keyless, pay-per-call API access on Base
  • —Agents that can settle x402 USDC payments automatically
  • —Users who prefer no-subscription, usage-based pricing

Not for

  • —Users who need detailed API documentation before integrating
  • —High-volume consumers who need bulk/subscription pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/backups/25
# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.

Example

Response

{
  "error": "X-PAYMENT header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://lowpaymentfee.com/api/v1/backups/25",
      "description": "Premium API Access",
      "maxAmountRequired": "20000",
      "maxTimeoutSeconds": 300
    }
  ],
  "x402Version": 1
}

Endpoint

URLhttps://lowpaymentfee.com/api/v1/backups/25
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the backup resource actually contains. The broader site lists many endpoints but provides zero docs beyond wallet-connect prompts.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'
  • —No OpenAPI or schema describing request body or response payload for /api/v1/backups/25
  • —Purpose of 'backups/25' resource is completely undocumented
  • —No robots.txt or agents.txt present

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 16:06:32Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/2YBDyy
x402-gated backup endpoint on Base, pay-per-request with USDC. — Clawmart · Clawmart