Mortgage data API endpoint on Base, pay-per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/26` appears to return mortgage information (likely for a specific mortgage record or product identified as #26), served as JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request.
The endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all at a uniform $0.02/request price point. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.
Documentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the mortgages endpoint accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body is expected or what the response payload looks like.
Capabilities
Use cases
- —Retrieving mortgage data or rates programmatically without API key registration
- —Integrating mortgage information into agent workflows that support x402 payments
- —Querying specific mortgage records for financial analysis or comparison tools
Fit
Best for
- —Agents or apps that already support x402 payment protocol on Base
- —Quick one-off mortgage data lookups without subscription commitments
- —Developers experimenting with pay-per-call crypto-settled APIs
Not for
- —Users needing detailed documentation or guaranteed SLA before integration
- —Bulk mortgage data retrieval where per-request pricing would be costly
- —Applications requiring non-crypto payment methods
Quick start
# The endpoint requires an x402 payment header (USDC on Base, $0.02/call).
# Using curl as illustration — in practice, use an x402-aware client.
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/26 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge, but there is zero documentation on request format, response schema, or what 'mortgages/26' actually returns. No OpenAPI spec, no examples, and all doc pages are empty. The listing is essentially a stub.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only a wallet-connect prompt with no content
- —No OpenAPI or schema describing request body or response format for the mortgages endpoint
- —It is unclear what data 'mortgages/26' returns — could be a specific record, a category, or a placeholder
- —The platform lists many endpoints but none appear to have public documentation
Citations
- —Endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/mortgages/26
- —Platform advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/mortgages/26