Pay-per-call ACH endpoint on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at `/api/v1/ach/53` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is listed under "Premium API Access" but its exact functionality is unclear — the path suggests ACH (Automated Clearing House) payment-related data or operations, though no documentation beyond the endpoint title is available. The platform advertises a flat $0.02 per request across all its endpoints.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain on Base using USDC (contract `0x8335...2913`) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is "exact" with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by the x402 micropayment.
The broader lowpaymentfee.com platform lists endpoints across data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, the `/api/v1/ach/53` endpoint does not appear in the publicly listed catalog on the homepage, and no schema, request/response examples, or detailed documentation were found for it. The docs, pricing, and API pages all returned only a "Connect wallet" prompt with no substantive content.
Capabilities
Use cases
- —Accessing ACH-related data or operations on a per-call basis without subscription
- —Agent-driven payment workflows where per-request USDC micropayments replace API keys
- —Integrating low-cost financial endpoints into automated pipelines
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go ACH-related API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing quick, keyless access to financial endpoints
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume use cases where per-request pricing may add up compared to bulk plans
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/53 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what the /api/v1/ach/53 endpoint actually does. The endpoint is not listed in the site's public catalog. This is effectively a stub listing.
Warnings
- —No documentation found — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.
- —The /api/v1/ach/53 endpoint is not listed in the site's public API catalog; its purpose is unclear.
- —No request or response schema is available; input/output formats are unknown.
- —The 'Premium API Access' title is generic and does not describe the endpoint's function.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/ach/53
- —The 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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/ach/53
- —Docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive documentationhttps://lowpaymentfee.com/docs