Pay-per-call API platform on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, rate limits, or upfront commitments.
The specific endpoint at `/api/v1/wire/53` is listed as "Premium API Access." Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST requests and returns `application/json`. Payment is made via the x402 exact scheme, with a 300-second timeout window.
The broader platform advertises 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 per request price point. However, documentation beyond the landing page is essentially empty (docs, pricing, and README pages all show only a "Connect wallet" prompt), so the actual request/response schemas for individual endpoints are unknown.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API key management
- —Programmatic access to utility or data endpoints with per-call crypto micropayments
- —Testing x402 payment flows on Base network
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-native agents that can settle USDC on Base
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or rate-limited tiers
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/53 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/wire/53' specifically is unclear beyond the generic label 'Premium API Access.' The docs, pricing, and README pages are all blank stubs.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.
- —The specific function of /api/v1/wire/53 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.
- —No request or response schema is published for any endpoint on the platform.
- —The platform lists many endpoint categories (AI, finance, analytics, utils) but none have documented input/output contracts.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/53
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/wire/53
- —Docs, pricing, and README pages show only a 'Connect wallet' prompt with no substantive contenthttps://lowpaymentfee.com/docs