Premium API access subscription endpoint on Base network, paid per-call via x402 in USDC.
What it does
This endpoint at lowpaymentfee.com provides a "Premium API Access" subscription resource (ID 62) accessible via the x402 payment protocol. It accepts POST requests and requires an X-PAYMENT header with a crypto payment on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The maximum amount required is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals).
The parent site lowpaymentfee.com hosts a collection of pay-per-request APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/crypto market data, and utility services. All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and instant access. The specific subscription endpoint (ID 62) appears to be part of a Stripe subscriptions management layer, though the exact response payload and subscription mechanics are not documented in the available crawl material.
The endpoint is live and returns a valid x402 challenge (version 1) with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical content.
Capabilities
Use cases
- —Programmatic subscription activation or management via crypto payment
- —Agent-driven access to premium API tiers without traditional API keys
- —Automated pay-per-use access to bundled API services
Fit
Best for
- —Agents needing keyless, pay-per-call API access on Base
- —Developers wanting to avoid traditional subscription billing
- —Crypto-native applications requiring on-chain payment verification
Not for
- —Users who need detailed API documentation before integrating
- —Applications requiring fiat-only payment methods
- —High-volume use cases where per-request pricing may be costly at scale
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/62 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documented request/response format, and no meaningful documentation beyond a wallet-connect prompt. The purpose of the 'subscriptions/62' resource is unclear from available material.
Warnings
- —No API documentation available — docs/pricing/README pages only show 'Connect wallet'
- —No OpenAPI or output schema describing what this endpoint returns
- —The exact behavior of the subscription endpoint (what it provisions, response format) is undocumented
- —Cannot confirm what 'Premium API Access' actually grants beyond the endpoint name
Citations
- —Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/subscriptions/62
- —Site advertises $0.02 per request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/62