x402-gated mortgage data endpoint on Base, pay-per-request with USDC.
What it does
This endpoint at `/api/v1/mortgages/44` is part of the lowpaymentfee.com platform, which offers a variety of pay-per-call APIs gated via the x402 protocol on the Base network. The specific resource appears to serve mortgage-related data (likely a single mortgage record identified by ID 44), though no detailed documentation or response schema is available to confirm the exact payload structure. The endpoint accepts POST requests and returns `application/json`.
Pricing is set at a maximum of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site-wide flat pricing advertised on the landing page. Payment is handled via the x402 exact-payment scheme: callers attach an `X-PAYMENT` header with a signed payment proof, and the server validates it before returning the response. No API keys, rate limits, or subscriptions are required.
The broader lowpaymentfee.com platform lists endpoints across data analytics, AI/ML inference, finance, crypto, and utility categories, all at the same $0.02/request price point. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no description of what fields the mortgage endpoint returns. This makes integration speculative without trial-and-error experimentation.
Capabilities
Use cases
- —Retrieving mortgage record details by ID for financial analysis
- —Integrating mortgage data into agent workflows without subscription overhead
- —Programmatic access to mortgage information with crypto micropayments
Fit
Best for
- —Developers wanting frictionless pay-per-call mortgage data access
- —AI agents that can settle x402 payments on Base
- —Projects needing occasional mortgage lookups without API key management
Not for
- —Bulk mortgage data retrieval (no documented batch endpoints)
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Non-crypto workflows that cannot settle USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/44 \
-H "X-PAYMENT: <signed-x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the mortgage endpoint actually returns. The docs pages are empty. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —No request or response schema provided; the exact data returned by /api/v1/mortgages/44 is unknown.
- —No OpenAPI specification or ai-plugin manifest found.
- —The purpose of this specific mortgage endpoint (ID 44) is unclear — it may be a demo or placeholder.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, requiring USDC payment on Base network.https://lowpaymentfee.com/api/v1/mortgages/44
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/mortgages/44
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories.https://lowpaymentfee.com