x402-gated premium API access on Base, paid per-call in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall. The specific resource at `/api/v1/stripe/subscriptions/170` is part of a broader platform that offers dozens of pay-per-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. All endpoints on the platform use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.
The x402 challenge for this particular endpoint advertises a maximum amount of 20,000 base units of USDC (USD Coin, 6 decimals), which equals $0.02 per request. The payment is settled on-chain on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json` responses.
Notably, the endpoint path (`/api/v1/stripe/subscriptions/170`) suggests a subscription-related resource, but the x402 challenge uses the "exact" scheme (one-shot per-call payment) rather than a recurring subscription model. The actual functionality behind this specific endpoint is not documented beyond the label "Premium API Access." The broader platform's docs, pricing, and API pages returned only a wallet-connect prompt with no additional technical documentation, so the precise request/response schema is unknown.
Capabilities
Use cases
- —Accessing premium API functionality with per-call USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Programmatic access to services without traditional subscription management
Fit
Best for
- —Developers or agents who want to pay per call without API key management
- —Users already holding USDC on Base who want frictionless API access
- —Exploratory or low-volume usage where commitment-free pricing is preferred
Not for
- —Users who need detailed API documentation or well-defined request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or traditional subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/170 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02/call in USDC on Base), but there is no documentation of the request/response schema, no OpenAPI spec, and the docs/pricing/API pages are all behind a wallet-connect wall with no content. The specific functionality of this 'Premium API Access' endpoint is entirely opaque.
Warnings
- —No request or response schema documented; actual functionality behind 'Premium API Access' is unknown
- —All documentation pages (docs, pricing, API, README) returned only a wallet-connect prompt with no usable content
- —Endpoint path references 'stripe/subscriptions' but the x402 challenge uses one-shot 'exact' scheme — naming may be misleading
- —No OpenAPI spec or ai-plugin manifest available
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/170
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC on Base)https://lowpaymentfee.com/api/v1/stripe/subscriptions/170