Pay-per-request loan data API on Base via x402, settled in USDC at $0.02/call.
What it does
This endpoint at lowpaymentfee.com provides access to a loan data resource (loan ID 61) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).
The provider, lowpaymentfee.com, hosts a broader catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely through the x402 protocol on the Base L2 network.
This specific endpoint (/api/v1/loans/61) is described only as "Premium API Access" with no further documentation on request parameters or response schema. The docs, pricing, and API pages on the site require a wallet connection and provide no additional technical detail. Without an OpenAPI spec, example payloads, or detailed documentation, the exact data returned by this loan endpoint is unclear.
Capabilities
Use cases
- —Retrieving loan data for loan ID 61 on a per-request payment basis
- —Integrating pay-per-use financial data into agent workflows without API key management
- —Demonstrating x402 protocol payment flows on Base network
Fit
Best for
- —Agents or applications that need on-demand loan data without subscription commitments
- —Developers experimenting with x402 payment protocol integrations
- —Use cases requiring keyless, pay-as-you-go API access on Base
Not for
- —Users needing detailed loan analytics documentation or well-defined schemas before integration
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/loans/61 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the generic 'Premium API Access' label, and the crawled docs/pricing/API pages are empty (wallet-gated). The purpose of the /api/v1/loans/61 endpoint is unclear.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The exact data returned by /api/v1/loans/61 is undocumented — 'Premium API Access' is the only description
- —All documentation pages (docs, pricing, API, README) are gated behind wallet connection and provide no content
- —The broader site lists many diverse API categories but none have visible technical documentation
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/loans/61
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/loans/61