x402-gated premium API endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/v1/benefits/78` is part of the lowpaymentfee.com platform, which offers a suite of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific endpoint is labeled "Premium API Access" and is gated behind an x402 payment challenge requiring USDC on the Base network.
The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request. This is consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism. The endpoint accepts POST requests and returns `application/json`.
However, the specific functionality behind `/api/v1/benefits/78` is not documented beyond the generic "Premium API Access" label. The site's docs, pricing, and README pages all render only a "Connect wallet" prompt with no further content. Without documentation of request parameters, response schema, or what data/service this particular endpoint provides, it is impossible to determine its concrete utility. The endpoint is live (returning a valid 402 challenge), but its purpose remains opaque.
Capabilities
Use cases
- —Accessing a premium API resource with per-request USDC micropayments
- —Integrating x402-compatible agents with pay-as-you-go endpoints
- —Testing x402 protocol payment flows on Base
Fit
Best for
- —Developers experimenting with x402 pay-per-request protocols
- —Agents that can settle USDC payments on Base network
- —Users who want keyless, no-signup API access
Not for
- —Users who need documented request/response schemas before integrating
- —Anyone requiring free or subscription-based API access
- —Production use cases requiring SLA guarantees or support
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/benefits/78
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with a valid USDC payment proof on Base to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://lowpaymentfee.com/api/v1/benefits/78",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is zero documentation on what the endpoint actually does — no input schema, no output schema, no description beyond the generic label. The docs/pricing/README pages are all empty (wallet-connect only). This is effectively a stub listing.
Warnings
- —No documentation available for this specific endpoint's functionality or parameters
- —All doc pages on the site render only 'Connect wallet' with no content
- —The label 'Premium API Access' is generic and does not describe what data or service is returned
- —No input or output schema provided — request format is unknown
- —Cannot verify what the endpoint returns after successful payment
Citations
- —The endpoint returns a 402 challenge requiring USDC on Base with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/benefits/78
- —The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/benefits/78
- —Docs, pricing, and README pages show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs