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 via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/7` is part of a broader platform that offers dozens of API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.
The endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed payment proof for up to $0.02 (20,000 base units of USDC, which has 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is individually settled on-chain.
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, and no description of what the `/api/v1/mortgages/7` endpoint actually returns beyond the generic label "Premium API Access." The mortgage endpoint itself is not listed on the homepage among the advertised APIs, making its exact functionality unclear. Users should expect to experiment with POST payloads to discover the input format and response structure.
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 needing on-demand mortgage data with crypto micropayments
- —Projects that want keyless, pay-as-you-go API access on Base
- —Exploring x402 protocol integrations for financial endpoints
Not for
- —Users who need detailed documentation or well-defined schemas before integrating
- —High-volume mortgage data consumers who need bulk pricing or SLAs
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/mortgages/7 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific mortgage endpoint is not even listed on the provider's homepage. The purpose and data returned are entirely unknown beyond the generic 'Premium API Access' label.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition for request or response payloads
- —The /api/v1/mortgages/7 endpoint is not listed among the provider's advertised APIs on the homepage
- —Exact functionality of this mortgage endpoint is unknown; 'Premium API Access' is the only description provided
- —The resource path includes a hardcoded ID ('7'), purpose unclear
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/mortgages/7
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —The /docs, /pricing, /api, and /README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/mortgages/7