Mortgage data endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data at `/api/v1/mortgages/99`. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network.
The specific endpoint `/api/v1/mortgages/99` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x8335…2913`). The x402 challenge advertises a `maxAmountRequired` of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request — consistent with the platform's uniform $0.02/request pricing displayed on its landing page. No API keys or rate limits are required; access is granted immediately upon valid x402 payment.
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 schema, no request/response examples, and no description of what the mortgages endpoint actually returns (e.g., whether "99" is a resource ID, a product type, or something else). The endpoint is live and responds with a well-formed 402 challenge, but the lack of documentation makes it difficult to know what data to send or what to expect back.
Capabilities
Use cases
- —Retrieving mortgage-related data or calculations on a per-request basis
- —Integrating mortgage information into agent workflows without API key management
- —Paying for financial data access with USDC on Base L2
Fit
Best for
- —Developers or agents wanting keyless, pay-per-call mortgage data
- —x402-compatible agents on the Base network
- —Quick one-off mortgage data lookups without subscription commitments
Not for
- —Users who need detailed API documentation or schemas before integrating
- —High-volume mortgage data pipelines where per-call pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/99 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages/99 resource represents. The docs pages are all blank 'Connect wallet' stubs. This is effectively a stub listing.
Warnings
- —No documentation available — all doc pages render only 'Connect wallet'
- —No OpenAPI or request/response schema provided
- —Purpose of /api/v1/mortgages/99 is unclear — unknown what data it returns or what input it expects
- —The endpoint path suggests a specific resource ID (99) but no context is given
Citations
- —Uniform $0.02/request pricing, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/mortgages/99
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/mortgages/99