Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no rate limits, and no sign-up — callers simply attach an X-PAYMENT header with a valid payment proof to each request.
The specific endpoint `/api/v1/wire/33` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts 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 examples of what `/api/v1/wire/33` actually returns. The site lists many endpoint categories (sentiment analysis, text summarization, geocoding, price feeds, etc.) but provides no detail on input parameters or response formats for any of them. Without documentation it is unclear what this specific wire/33 endpoint does beyond the generic "Premium API Access" label.
Capabilities
Use cases
- —Accessing pay-per-call API services without sign-up or API key management
- —Making micropayment-gated API calls settled in USDC on Base
- —Integrating x402-compatible endpoints into agent workflows
Fit
Best for
- —Developers wanting zero-friction API access without accounts or subscriptions
- —AI agents that can autonomously pay for API calls via x402
- —Users who prefer crypto micropayments over traditional billing
Not for
- —Users who need detailed API documentation and request/response schemas before integrating
- —High-volume callers who would benefit from bulk pricing or subscription plans
- —Anyone without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/33 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint (wire/33) is entirely unclear. The site's docs pages are empty beyond a wallet-connect prompt.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only 'Connect wallet' with no content
- —No OpenAPI or schema definition for this endpoint
- —The purpose of /api/v1/wire/33 ('Premium API Access') is not explained anywhere — it is unclear what data or service it provides
- —The site lists many endpoint categories but none have documented input/output schemas
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/wire/33 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/wire/33
- —Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com