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 specific resource `/api/v1/charges/151` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.
The x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment timeout is 300 seconds. The response MIME type is `application/json`.
Note that the specific functionality behind `/api/v1/charges/151` is not documented beyond the label "Premium API Access." The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point. However, the crawled documentation pages returned only "Connect wallet" with no further technical detail, so the exact input/output schema for this particular endpoint is unknown.
Capabilities
Use cases
- —Accessing paid API services without API key registration
- —Making one-off API calls with per-request USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
Fit
Best for
- —Developers wanting frictionless pay-per-use API access without subscriptions
- —AI agents that can settle x402 payments autonomously
- —Users already holding USDC on the Base network
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without USDC on Base or unfamiliar with crypto payment flows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/151 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/charges/151 is undocumented. No OpenAPI schema, no input/output examples, and all documentation pages returned only 'Connect wallet' with no content. The endpoint is effectively a stub listing.
Warnings
- —The exact functionality behind /api/v1/charges/151 ('Premium API Access') is not described anywhere in the crawled material.
- —All documentation, pricing, API, and README pages returned only 'Connect wallet' with no substantive content.
- —No OpenAPI spec or input/output schema is available — callers cannot know what to send or what to expect back.
- —The platform lists many endpoints but none have detailed documentation visible in the crawl.
Citations
- —All endpoints priced at $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 (6 decimals) = $0.02, with 300s timeout on Basehttps://lowpaymentfee.com/api/v1/charges/151
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/151
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com