Premium API access via x402 micropayment on Base network, $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" gated by the x402 payment protocol. The provider operates a suite of APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/apikeys/93` accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the exact-amount scheme. The x402 challenge confirms the endpoint is live and discoverable.
Documentation on the site is extremely sparse—most pages beyond the landing page only show a "Connect wallet" prompt. No OpenAPI spec, request/response schemas, or usage examples are published. The exact functionality behind this particular endpoint path (`/apikeys/93`) is unclear; it may provision or return an API key, but this is not documented. The broader platform advertises categories like sentiment analysis, text summarization, geocoding, price feeds, and more, all at the same $0.02 price point.
Capabilities
Use cases
- —Accessing premium API services without subscription or API key management
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven programmatic access to gated endpoints via x402 protocol
Fit
Best for
- —Developers wanting pay-per-use API access without accounts or subscriptions
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Applications requiring high-throughput bulk access with volume discounts
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation, no request/response schema, and the specific functionality of this endpoint path is undocumented. Most site pages return only a wallet-connect prompt.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages are empty (only show 'Connect wallet')
- —The exact purpose of /api/v1/apikeys/93 is unclear—may provision API keys but this is unconfirmed
- —No examples of successful responses are available
Citations
- —Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/apikeys/93
- —Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/apikeys/93