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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.
The specific endpoint `/api/v1/charges/131` accepts POST requests and is gated by an x402 payment challenge. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The response MIME type is `application/json`. The payment timeout is 300 seconds.
However, the exact functionality behind this particular `/charges/131` endpoint is unclear. The landing page lists many specific API paths (metrics, reports, sentiment analysis, summarization, geocoding, etc.) but does not list `/api/v1/charges/131` among them. It may be a generic charge endpoint or a specific resource not documented on the homepage. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no additional documentation. Without further documentation, the precise input/output schema and the data returned by this endpoint remain unknown.
Capabilities
Use cases
- —Accessing premium API data with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Programmatic access to paid endpoints without subscription or API key management
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over traditional billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without a Base-compatible wallet funded with USDC
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/131 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/charges/131 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no content. The endpoint path does not match any of the listed APIs on the homepage.
Warnings
- —The endpoint /api/v1/charges/131 is not listed among the documented APIs on the homepage — its exact purpose is unknown.
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec, request schema, or response schema is available — input/output format is entirely unknown.
- —The platform appears to be a generic x402 demo or early-stage project; reliability and data quality are unverified.
Citations
- —The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with 300s timeouthttps://lowpaymentfee.com/api/v1/charges/131
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/131