Pay-per-call premium API access on Base via x402 — $0.02/request 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 advertises a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/apikeys/65` is listed as "Premium API Access" and returns a valid x402 challenge (HTTP 402) with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated purely by per-call USDC micropayment.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoint actually returns. The name "Premium API Access" and the path segment `apikeys/65` suggest this endpoint may provision or return an API key, but this is speculative. Without documentation or sample responses, the actual functionality cannot be confirmed.
Capabilities
Use cases
- —Acquiring API access or keys via a single USDC micropayment
- —Agent-driven programmatic access to paid endpoints without traditional API key signup
- —Demonstrating x402 payment protocol integration for per-call billing
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need instant, keyless API access paid in USDC on Base
- —Low-volume or one-off API calls where subscription pricing is undesirable
Not for
- —Users who need detailed documentation or guaranteed SLAs before purchasing
- —High-volume use cases where per-call pricing at $0.02 may add up quickly
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/65 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality of this specific endpoint is unclear — the name 'Premium API Access' and path 'apikeys/65' are the only hints. The broader site lists many endpoints but provides no docs beyond a wallet-connect prompt.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format
- —Actual functionality of /api/v1/apikeys/65 is unknown — 'Premium API Access' is the only description
- —No examples or sample responses available anywhere in the crawl
- —The broader platform lists many endpoints but none have documented behavior
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/apikeys/65
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/apikeys/65
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs