Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/payments/262` is labeled "Premium API Access" in the x402 challenge. Its exact functionality beyond that label is not documented — the crawled docs, pricing, API, and README pages all returned only a "Connect wallet" stub with no further detail. The x402 challenge confirms the endpoint is live, accepts POST requests, requires a maximum payment of 20,000 base units of USDC (i.e., $0.02), and returns `application/json`. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl.
Because the endpoint's specific behavior is undocumented and the broader site's documentation pages are empty stubs, agents should treat this as a low-information listing. The payment mechanics are clear and functional, but what the endpoint actually returns for a given request body is unknown.
Capabilities
Use cases
- —Paying per request for API access without API keys or subscriptions
- —Agent-driven API consumption with automatic USDC micropayments on Base
- —Accessing premium data or services via x402 protocol
Fit
Best for
- —Developers or agents wanting keyless, pay-per-call API access
- —x402-compatible agents settling payments in USDC on Base
- —Low-commitment API usage with no rate limits or minimums
Not for
- —Users who need detailed API documentation or request/response schemas before calling
- —Applications requiring non-crypto 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/payments/262 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond 'Premium API Access' is completely undocumented. All doc pages returned empty stubs.
Warnings
- —No documentation available — all doc/pricing/API/README pages return only a 'Connect wallet' stub
- —No OpenAPI or request/response schema provided; the exact behavior of /api/v1/payments/262 is unknown
- —Endpoint label 'Premium API Access' is generic and does not describe what data or service is returned
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/262
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/payments/262