Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/wire/56` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation pages beyond the landing page returned only a "Connect wallet" prompt with no further technical detail, so the actual request/response schemas for this and other endpoints are unknown.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Paying per-call for miscellaneous data, AI, or utility endpoints via USDC on Base
- —Programmatic access to a multi-category API catalog with uniform pricing
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —Use cases where uniform $0.02/request pricing simplifies budgeting
- —x402-compatible agent wallets on the Base network
Not for
- —Users who need detailed API documentation or well-defined request/response schemas before integrating
- —High-volume use cases where per-request pricing may add up compared to subscription plans
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/56 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, and the landing page provides a catalog overview with pricing. However, there is no OpenAPI spec, no request/response schema documentation, and all docs/pricing/README pages return only a 'Connect wallet' stub. The purpose of this specific '/api/v1/wire/56' endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet' with no technical content.
- —The specific function of /api/v1/wire/56 ('Premium API Access') is not described anywhere; it does not match any of the named endpoints on the landing page.
- —No request or response schemas are available for any endpoint on this platform.
- —The platform's breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from the available material.
Citations
- —Endpoint returns x402 challenge with maxAmountRequired 20000 USDC base units on Base networkhttps://lowpaymentfee.com/api/v1/wire/56
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/56
- —Platform lists endpoints for analytics, AI, finance, and utility categorieshttps://lowpaymentfee.com