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. The specific resource `/api/v1/charges/114` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/114`) is labeled generically as "Premium API Access" and its exact functionality is not documented — it may serve as a generic charge endpoint or gateway.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with a 300-second payment timeout. Documentation on the site is extremely thin: the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.
Capabilities
Use cases
- —Programmatic access to premium API services without API key management
- —Agent-driven pay-per-call workflows settled in USDC on Base
- —Integrating low-cost micropayment-gated endpoints into automated pipelines
Fit
Best for
- —Developers wanting keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —Applications requiring high-throughput with predictable flat-rate pricing
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/114 \
-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 spec, no request/response schema, and no examples. The specific functionality of /api/v1/charges/114 is unclear beyond the generic 'Premium API Access' label. Docs pages are empty stubs.
Warnings
- —No OpenAPI spec or request/response schema available
- —Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content
- —The exact functionality of /api/v1/charges/114 is undocumented — unclear what data or service it returns
- —No usage examples or sample responses found in crawled material
Citations
- —Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/charges/114
- —All APIs listed at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/114