Mortgage data API endpoint on Base, paid per-request via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides mortgage-related data via a pay-per-call x402 protocol. The specific resource `/api/v1/mortgages/100` appears to serve mortgage information (likely for a specific mortgage ID or scenario), accepting POST requests and returning JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 6 decimals).
The provider lowpaymentfee.com hosts a broad catalog of x402-enabled APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced uniformly at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access. However, the mortgage endpoint specifically is not listed on the provider's landing page among the advertised API categories, so its exact response schema and data contents are unclear.
Documentation is extremely sparse. The /docs, /pricing, /api, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI spec, no example request/response documentation, and no description of what fields the mortgage endpoint returns. Users should expect to experiment with the endpoint to discover its behavior.
Capabilities
Use cases
- —Retrieving mortgage data or calculations programmatically
- —Integrating mortgage information into financial applications
- —Agent-driven mortgage data lookups without API key management
Fit
Best for
- —Developers needing on-demand mortgage data without subscription commitments
- —AI agents that can settle x402 payments on Base
- —Applications requiring keyless, pay-per-use financial data access
Not for
- —Users who need detailed documentation or guaranteed response schemas before integrating
- —High-volume mortgage data consumers who would benefit from bulk pricing
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/100 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but documentation is essentially nonexistent — no OpenAPI spec, no example requests or responses, no description of what the mortgage endpoint actually returns. The endpoint isn't even listed among the provider's advertised APIs. Pricing is clear but everything else must be guessed.
Warnings
- —The /api/v1/mortgages/100 endpoint is not listed among the provider's advertised API catalog — its availability and data contents are unverified beyond the 402 challenge.
- —All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no useful content.
- —No OpenAPI schema, no example request body, and no example response are available — the endpoint's input/output contract is unknown.
- —The mortgage endpoint may involve regulated financial data; verify compliance requirements for your jurisdiction.
Citations
- —The endpoint returns a 402 x402 challenge with USDC on Base network, maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/mortgages/100
- —The provider advertises $0.02 per request, no API keys, no rate limits, instant access, Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/100
- —The mortgage endpoint is not listed among the provider's advertised API categorieshttps://lowpaymentfee.com