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 broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request, and the server fulfills the call once payment is verified.
The specific endpoint at `/api/v1/wire/1` is listed as "Premium API Access." Its x402 challenge confirms it is live, accepting POST requests, and requires up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.
Documentation is extremely thin: 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 from the crawl. The actual functionality behind `/api/v1/wire/1` ("Premium API Access") is unclear — the name is generic and no input/output schema is documented beyond the x402 challenge's indication that it accepts POST with `application/json` responses.
Capabilities
Use cases
- —Agents that need to call utility or data APIs without pre-registering for API keys
- —Programmatic access to analytics, AI inference, or finance data with per-call USDC payments
- —Testing x402 protocol integrations against a live, low-cost endpoint
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402 protocol experimentation on Base with low per-call costs
- —Scenarios where avoiding API key management is valuable
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume use cases where $0.02/request adds up and bulk pricing is preferred
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/1 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but documentation is essentially absent — every doc page returns only 'Connect wallet.' The purpose of /api/v1/wire/1 is unclear, there is no input/output schema, and no examples exist. This is effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.
- —The specific functionality of /api/v1/wire/1 ('Premium API Access') is undocumented — it is unclear what data or service it provides.
- —No OpenAPI spec, request schema, or response schema is available.
- —No usage examples or sample responses could be found.
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The x402 challenge for /api/v1/wire/1 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/wire/1
- —The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com