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/charges/85` 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 requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet address `0x1A2B...85F3` on the Base network. The payment timeout is 300 seconds.
Documentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns. Users should be aware that without further documentation, the behavior of this endpoint is unclear and must be discovered experimentally.
Capabilities
Use cases
- —Programmatic access to a premium API endpoint with per-request USDC micropayments
- —Agent-driven API consumption without pre-registration or API keys
- —Exploring x402 payment protocol integrations on Base
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can settle USDC payments on Base automatically
- —Users who want zero-commitment, pay-as-you-go API access
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume consumers who need bulk pricing or rate-limit guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/85 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is unknown beyond the generic label 'Premium API Access'. Docs pages all render only a wallet-connect prompt.
Warnings
- —The exact functionality of /api/v1/charges/85 is undocumented — 'Premium API Access' is the only description available.
- —All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI schema, no request body schema, and no response examples are available.
- —The endpoint path '/api/v1/charges/85' does not match any of the named API categories listed on the homepage, making its purpose unclear.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/85
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/85