Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at lowpaymentfee.com provides a pay-per-request API accessed via the x402 protocol on the Base network. The specific path `/api/v1/ach/50` is listed under the provider's "Premium API Access" label. Payment is settled in USDC (USD Coin) on Base at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.
The broader lowpaymentfee.com platform advertises a wide catalog of pay-per-call endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and crypto market data, and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and x402 payment flow on Base.
The specific functionality behind `/api/v1/ach/50` is not clearly documented — the provider's landing page does not list this particular path among its advertised APIs, and the docs, pricing, and README pages all render only a "Connect wallet" prompt with no additional content. The endpoint is confirmed live (returns a valid 402 challenge), but the actual data or service it provides is unclear. Callers should be aware that documentation is essentially absent for this specific route.
Capabilities
Use cases
- —Programmatic ACH-related data or processing via a single pay-per-call request
- —Agent-driven financial workflows that need on-demand API access without subscription
- —Integrating x402-settled endpoints into automated pipelines on Base
Fit
Best for
- —Developers wanting zero-setup, keyless API access settled in USDC on Base
- —AI agents that can autonomously pay for API calls via x402
- —Users who prefer pay-as-you-go pricing with no rate limits or commitments
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone unable to settle payments in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/50 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation for the specific /api/v1/ach/50 path, no OpenAPI schema, no request/response examples, and the docs pages are empty. The actual functionality of this endpoint is unknown.
Warnings
- —The specific endpoint /api/v1/ach/50 is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.
- —All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no usable content.
- —No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or expect back.
- —The 'Premium API Access' description is generic and does not describe actual functionality.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/ach/50
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/50
- —Docs, pricing, README, and API pages render only 'Connect wallet' with no documentation contenthttps://lowpaymentfee.com/docs