x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that exposes a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are payable per-request via the x402 protocol on the Base network using USDC (USD Coin). The specific endpoint at `/api/v1/item/43` is listed as "Premium API Access" and accepts POST requests, returning application/json responses.
The platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the x402 challenge for this particular endpoint (`/api/v1/item/43`) specifies a `maxAmountRequired` of 20000 (in USDC's 6-decimal representation, this equals $0.02), consistent with the advertised pricing. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. The specific functionality behind `/api/v1/item/43` ("Premium API Access") is not documented, and no input/output schema details are available beyond the basic x402 challenge metadata. The platform lists many endpoints on its homepage but provides no detailed documentation for any of them.
Capabilities
Use cases
- —Accessing premium API data via x402 micropayments without traditional API key signup
- —Programmatic agent-driven API consumption with per-call USDC payments on Base
- —Exploring x402 protocol integration for pay-as-you-go API access
Fit
Best for
- —Developers experimenting with x402 protocol payments
- —Agents needing keyless, pay-per-request API access on Base
- —Users who want to avoid subscription commitments for API usage
Not for
- —Users needing detailed API documentation or well-defined schemas before integration
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/item/43 \
-H "Content-Type: application/json"
# Returns 402 with x402 payment challenge; include X-PAYMENT header with valid USDC payment to access.Example
Response
{
"error": "X-PAYMENT header is required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://lowpaymentfee.com/api/v1/item/43",
"description": "Premium API Access",
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1
}Endpoint
Quality
The endpoint is live and returns a valid 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. The specific functionality of /api/v1/item/43 is completely undocumented, with no input schema, output schema, or usage examples available. The listing is effectively a stub with a working payment gate.
Warnings
- —No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'
- —The specific functionality of /api/v1/item/43 ('Premium API Access') is entirely undocumented
- —No input or output schema provided beyond basic x402 challenge metadata
- —Cannot verify what data or service is actually returned after payment
Citations
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, no minimumshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 USDC on Base networkhttps://lowpaymentfee.com/api/v1/item/43
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/item/43
- —Docs, API, pricing, and README pages show only 'Connect wallet'https://lowpaymentfee.com/docs