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 site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each request costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/wire/37` is listed as "Premium API Access" and accepts HTTP POST requests. Payment is settled on-chain via the x402 exact-payment scheme using USDC (contract 0x8335…2913) on Base. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units (i.e., $0.02 USDC at 6 decimals) per call with a 300-second payment timeout.
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 schema, no request/response examples, and no description of what the `/api/v1/wire/37` endpoint specifically returns. The landing page lists many endpoints but does not clarify what "wire/37" maps to in the catalog. Prospective callers should be aware that without documentation, the actual behavior and output of this endpoint are unknown.
Capabilities
Use cases
- —Programmatic access to premium API services paid per-call with USDC on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Micropayment-gated API consumption without subscriptions or accounts
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over traditional API billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —Applications requiring free or fiat-billed API access
- —High-volume batch processing where per-call pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/37 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Example
Request
{
"url": "https://lowpaymentfee.com/api/v1/wire/37",
"body": {},
"method": "POST",
"headers": {
"X-PAYMENT": "<x402-payment-token>",
"Content-Type": "application/json"
}
}Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty. The endpoint path '/api/v1/wire/37' does not clearly map to any listed API category.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —The endpoint path /api/v1/wire/37 is not listed among the catalog endpoints on the landing page; its specific function is unknown.
- —No OpenAPI schema, no request body schema, and no response examples are provided.
- —Output behavior is entirely unknown — callers cannot predict what data this endpoint returns.
Citations
- —The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories, all priced at $0.02/request.https://lowpaymentfee.com
- —Pricing is $0.02/request with no API keys, no rate limits, instant access on Base network.https://lowpaymentfee.com
- —x402 challenge confirms USDC payment on Base with maxAmountRequired of 20000 base units (=$0.02) and 300s timeout.https://lowpaymentfee.com/api/v1/wire/37