Pay-per-call premium API access via x402 on Base, settled in USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" behind an x402 paywall on the Base network. The provider operates a broad catalog of pay-per-request APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/stripe/charges/3` is labeled "Premium API Access" in the x402 challenge. Its maxAmountRequired is 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts HTTP POST requests and returns application/json.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the "Premium API Access" label for this particular route (`/stripe/charges/3`) is unclear and may differ from the other listed API categories. Users should be aware that the endpoint's behavior is not documented beyond its title.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without traditional API key registration
- —Agent-driven workflows that need to pay per call using USDC on Base
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that can autonomously pay for API calls via crypto
- —Users who want no-signup, no-rate-limit API access
Not for
- —Users needing well-documented API contracts with full request/response schemas
- —Production workloads requiring SLA guarantees or support
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/3 \
-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 it is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific functionality of '/api/v1/stripe/charges/3' labeled 'Premium API Access' is ambiguous.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found for request or response payloads
- —The specific functionality of the '/api/v1/stripe/charges/3' route is unclear; 'Premium API Access' is a generic label
- —No examples or usage guides available from the provider
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/3
- —All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com