x402-gated API platform offering data, AI, finance, and utility endpoints at $0.02/request on Base.
What it does
lowpaymentfee.com is an x402 protocol API marketplace that exposes a broad set of endpoints across four 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 endpoints are pay-per-call at $0.02 each, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.
The specific endpoint at `/api/v1/ach/67` is listed as "Premium API Access" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the payTo address. The endpoint accepts HTTP POST requests and returns application/json.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/ach/67` path specifically is unclear; the "ach" segment might relate to ACH payment processing or could be an internal route identifier. Without documentation, the actual functionality behind this endpoint cannot be confirmed.
Capabilities
Use cases
- —Accessing data analytics and reporting endpoints without subscription commitments
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time financial data such as exchange rates, token quotes, and gas estimates
- —Using utility services like geocoding, validation, and data conversion
Fit
Best for
- —Developers wanting pay-per-use API access without API key management
- —Agents and bots that can settle payments in USDC on Base via x402
- —Projects needing low-cost, commitment-free access to diverse API categories
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Applications requiring non-crypto payment methods
- —High-volume use cases where subscription pricing would be more economical
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/ach/67 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/ach/67 is unclear. The listing is essentially a stub with confirmed liveness.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific purpose of /api/v1/ach/67 ('Premium API Access') is undocumented and unclear — 'ach' may refer to ACH payment processing but this is unconfirmed
- —No example requests or responses available anywhere in crawled content
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/ach/67
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs