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 API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are pay-per-request with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/stripe/subscriptions/110` is labeled "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC on Base, where USDC uses 6 decimals). Payment is made via the x402 exact scheme on the Base network, settling in USDC (contract 0x8335…2913) to the provider's wallet. The endpoint accepts HTTP POST requests and returns application/json responses.
Documentation on the platform is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what "Premium API Access" actually returns or what input it expects. The endpoint is live (returns a valid 402 challenge), but without further documentation it is unclear what data or functionality this specific subscription endpoint provides versus the other listed endpoints on the platform.
Capabilities
Use cases
- —Accessing premium API functionality without traditional API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven API consumption with per-request crypto payments
Fit
Best for
- —Developers who want keyless, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users already holding USDC on Base network
Not for
- —Users needing detailed API documentation or schemas before integrating
- —Anyone without USDC on Base or an x402-compatible payment client
- —Production workloads requiring SLA guarantees or support
Quick start
# The endpoint requires an x402 X-PAYMENT header with a valid USDC payment on Base.
# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/stripe/subscriptions/110
# 2. Parse the 402 response, construct the payment proof, and resend with:
# -H 'X-PAYMENT: <payment_token>'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is virtually no documentation: no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' actually provides. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or input/output schema provided; it is unknown what this endpoint actually returns.
- —The endpoint name 'stripe/subscriptions/110' suggests a subscription model, but the x402 challenge uses the 'exact' (one-shot) scheme — the actual behavior is unclear.
- —Cannot verify what data or service is delivered after payment.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/subscriptions/110
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/subscriptions/110
- —Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive contenthttps://lowpaymentfee.com/docs