x402-gated API key endpoint on Base, paying $0.02 in USDC per request.
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 pay-per-call 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 resource `/api/v1/apikeys/52` appears to be an API-key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to the payee address 0x1A2B…85F3. The payment timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response bodies were found in the crawl — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.
The broader platform advertises no API keys required, no rate limits, and instant access for its other endpoints, suggesting a frictionless pay-per-call model. However, the lack of documentation for this specific endpoint means the exact request body format and response structure are unknown. Use with caution until more documentation surfaces.
Capabilities
Use cases
- —Programmatically obtaining or activating an API key via a single micropayment
- —Agent-driven access provisioning without traditional signup flows
- —Paying for API access on-chain using USDC on Base
Fit
Best for
- —Agents or services that need to acquire API keys without manual registration
- —Developers experimenting with x402 pay-per-call patterns
- —On-chain payment workflows requiring low-cost USDC transactions on Base
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —High-volume batch operations where per-call pricing may add up
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/apikeys/52 \
-H "X-PAYMENT: <x402-payment-token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no documentation, no example requests or responses, and the docs/pricing/README pages are all empty (just 'Connect wallet'). The purpose of this specific endpoint (apikeys/52) is unclear beyond its title.
Warnings
- —No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.
- —The exact request body format and response schema for /api/v1/apikeys/52 are unknown.
- —The purpose of 'apikeys/52' is ambiguous — it may provision an API key or grant access, but this is inferred from the title alone.
- —No OpenAPI or ai-plugin manifest found.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/apikeys/52
- —All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/apikeys/52
- —The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com