x402-gated premium API access on Base, paid per-request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The endpoint is live and returns a standard x402 challenge requiring payment 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 landing page advertises a broad catalog of pay-per-call 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access via the Base network.
However, the specific endpoint `/api/v1/stripe/subscriptions/162` is labeled only as "Premium API Access" with no further documentation about what it actually returns or what input it expects. 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 examples, and no detailed documentation available. The endpoint accepts POST requests and returns application/json, but the actual functionality behind this particular subscription endpoint is unclear.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven API consumption without API keys or subscriptions
- —Programmatic pay-as-you-go access to data or services
Fit
Best for
- —Developers wanting keyless, pay-per-call API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over traditional API subscriptions
Not for
- —Users needing detailed API documentation before committing
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who need bulk pricing or rate guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/162
# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation about what the endpoint actually does, no request/response schema, and no examples. The label 'Premium API Access' is generic and uninformative. 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.
- —The specific functionality of /api/v1/stripe/subscriptions/162 is completely undocumented; 'Premium API Access' is the only description.
- —No OpenAPI spec or request/response schema provided.
- —The endpoint path includes 'stripe/subscriptions' which may imply Stripe integration, but this is unconfirmed.
Citations
- —Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/162
- —Provider advertises $0.02 per request pricing with no API keys, no rate limits, instant access on Basehttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/subscriptions/162
- —Provider lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com