Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/ach/102` is listed as "Premium API Access" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments.
The x402 challenge confirms the endpoint is live, accepting USDC (contract `0x8335…2913` on Base) with a `maxAmountRequired` of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The payment scheme is "exact" with a 300-second timeout.
The broader lowpaymentfee.com platform advertises endpoints across several categories — data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, this specific endpoint (`/api/v1/ach/102`) falls under a path suggesting ACH (Automated Clearing House) functionality, which is not explicitly documented on the site's landing page. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this or any other endpoint on the platform. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Programmatic ACH-related data or transaction access via a single POST call
- —Agent-driven workflows requiring low-cost per-request payment without authentication setup
- —Integrating pay-as-you-go financial endpoints into automated pipelines
Fit
Best for
- —Developers or agents wanting zero-setup, keyless API access
- —Crypto-native applications already on the Base network with USDC
- —Low-volume or bursty workloads where per-call pricing is economical
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integration
- —High-volume production use cases requiring rate-limit guarantees and support contracts
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/102 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example requests or responses, and the specific purpose of the /api/v1/ach/102 path is undocumented. The docs/pricing/API pages are all empty beyond a wallet-connect prompt.
Warnings
- —The /api/v1/ach/102 path is not listed on the site's landing page among advertised endpoints — its exact functionality is unknown.
- —No API documentation, request schema, or response schema is available for any endpoint on the platform.
- —The docs, pricing, and API pages render only 'Connect wallet' with no usable content.
- —ACH-related functionality may involve regulated financial services — verify compliance requirements before use.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/ach/102
- —USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/ach/102
- —Site advertises $0.02/request flat pricing with no API keys, no rate limits, instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Docs, pricing, and API pages show only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs