Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/ach/1` is listed under "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The broader lowpaymentfee.com platform advertises endpoints across several categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request.
Documentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all returned 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/ach/1` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality "Premium API Access" provides. The "ach" path segment may relate to ACH payment processing or bank transfer data, but this is speculative.
Capabilities
Use cases
- —Programmatic access to ACH-related data or processing via a single micropayment per call
- —Agent-driven workflows that need keyless, pay-as-you-go API access on Base
- —Integrating low-cost financial endpoints into automated pipelines without subscription overhead
Fit
Best for
- —Developers or agents wanting frictionless pay-per-request access without API key management
- —Crypto-native applications already operating on the Base L2 network
- —Low-volume or bursty workloads where per-call pricing is more economical than subscriptions
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/call adds up and bulk pricing would be preferable
- —Anyone requiring fiat-only payment rails with no crypto involvement
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/1 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages are empty. The listing is effectively a stub.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.
- —No OpenAPI or request/response schema provided; it is unknown what data /api/v1/ach/1 returns.
- —The purpose of 'Premium API Access' at /api/v1/ach/1 is unclear — the 'ach' path is suggestive but unconfirmed.
- —If this endpoint involves ACH bank transfers or financial processing, it may be subject to financial regulation (KYC/AML).
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/1
- —All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/1
- —Documentation pages (/docs, /api, /pricing, /README) contain only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs