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 at `/api/v1/charges/204` 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 entirely through the x402 `X-PAYMENT` header — no API keys, accounts, or rate limits are required.
The broader lowpaymentfee.com platform advertises a suite of endpoints 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/204`) is labeled generically as "Premium API Access" and its exact functionality is not documented beyond that label.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.
Capabilities
Use cases
- —Accessing premium API services without creating an account or managing API keys
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows that need instant, keyless API access with crypto payment
Fit
Best for
- —Developers who want zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without a Base-compatible wallet or USDC holdings
- —High-volume consumers who need bulk pricing or rate-limit guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/204 \
-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 actual functionality behind 'Premium API Access' is completely undocumented. No OpenAPI spec, no request/response schemas, no examples, and all doc pages are empty ('Connect wallet' only). The listing is effectively a stub with confirmed liveness and pricing.
Warnings
- —The exact functionality of /api/v1/charges/204 ('Premium API Access') is not documented anywhere in the crawled material.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.
- —No OpenAPI spec or request/response schema is available — callers cannot know what to send or what to expect back.
- —The broader site lists many endpoints but none have documented input/output contracts.
Citations
- —Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/charges/204
- —maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02https://lowpaymentfee.com/api/v1/charges/204
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation, API, pricing, and README pages all show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs