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 hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.
The specific endpoint `/api/v1/payments/190` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The response MIME type is `application/json`.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response schemas for any of these endpoints remain undocumented.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers exploring x402 pay-per-call patterns
- —Agents needing keyless, instant API access on Base
- —Low-volume consumers who want no subscription commitments
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/190 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but the endpoint's actual functionality ("Premium API Access") is entirely opaque — no request/response schema, no documentation, and all doc pages return only a wallet-connect prompt. The listing is effectively a stub with verified liveness.
Warnings
- —The exact functionality of /api/v1/payments/190 is undocumented; 'Premium API Access' is the only description available.
- —All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.
- —No request or response schema is available; integrators cannot determine what inputs are expected or what outputs are returned.
- —The broader platform lists many endpoints but none have documented schemas or example payloads.
Citations
- —Endpoint returns 402 with x402 challenge, confirming it is live on Base networkhttps://lowpaymentfee.com/api/v1/payments/190
- —Max amount required is 20000 base units of USDC (USD Coin, 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/payments/190
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/190
- —Documentation pages return only 'Connect wallet' with no contenthttps://lowpaymentfee.com/docs