Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint at `/api/v1/charges/207` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request. Payment is made via the x402 exact scheme, with a 300-second timeout window. The endpoint accepts HTTP POST and returns application/json.
The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available from the crawled material.
Capabilities
Use cases
- —Accessing premium API endpoints with per-call USDC micropayments on Base
- —Agent-driven workflows that need keyless, pay-as-you-go API access
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need instant, keyless API access via crypto micropayments
- —Low-volume or sporadic API consumers who want no subscriptions or commitments
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/207 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/charges/207 is undefined — it's unclear what data or service it returns. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — all docs/pricing/README pages render only 'Connect wallet'
- —The specific functionality of /api/v1/charges/207 ('Premium API Access') is not described anywhere
- —No request body schema or response schema is documented
- —No usage examples or error handling documentation found
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base with a 300-second timeouthttps://lowpaymentfee.com/api/v1/charges/207
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/charges/207