x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.
The specific endpoint `/api/v1/stripe/subscriptions/155` is listed as "Premium API Access" and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the platform's uniform $0.02/request pricing across all endpoints. Payment is made via the x402 exact scheme: callers include an X-PAYMENT header with a signed payment authorization, and the endpoint returns an `application/json` response.
The platform advertises no API keys, no rate limits, and instant access. Documentation pages (/docs, /pricing, /README) appear to require a wallet connection and did not yield substantive content during the crawl. Because of this, the actual functionality behind "Premium API Access" is unclear — the name and path suggest it may relate to Stripe subscription management, but no schema, parameter documentation, or example responses are available. Callers should be aware that the endpoint's concrete behavior is not documented in the crawled material.
Capabilities
Use cases
- —Paying per-call for premium API functionality without API keys or subscriptions
- —Programmatic access to a gated endpoint using x402 micropayments on Base
- —Agent-driven API consumption with on-chain USDC settlement
Fit
Best for
- —Developers wanting keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users who need detailed API documentation before integrating
- —Anyone requiring free or fiat-only payment methods
- —High-volume callers who would benefit from bulk/subscription pricing
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/155 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of what the endpoint actually does, no input/output schema, no example requests or responses, and the docs/pricing/README pages all returned only a wallet-connect prompt. The listing is effectively a stub with confirmed liveness and pricing but unknown functionality.
Warnings
- —No documentation available — /docs, /pricing, and /README pages all require wallet connection and returned no content.
- —The actual functionality behind 'Premium API Access' is unknown; the path '/api/v1/stripe/subscriptions/155' suggests Stripe subscription management but this is unconfirmed.
- —No input or output schema is provided beyond the basic outputSchema stub in the x402 challenge.
- —No examples of request bodies or response payloads are available.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/155
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/155