XMR liquidity data via pay-per-call x402 on Base (USDC, $0.02/request)
What it does
This endpoint at lowpaymentfee.com provides DeFi liquidity data for Monero (XMR) through a simple HTTP POST call, paid per-request using the x402 protocol. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The endpoint is part of a broader catalog hosted at lowpaymentfee.com that spans data analytics, AI/ML inference, finance/Web3 market data, and utility services, all uniformly priced at $0.02 per call. The specific path `/api/v1/defi/XMR/liquidity` is not listed on the provider's landing page among the advertised endpoints, but the x402 challenge is live and returns a well-formed 402 response with an outputSchema indicating a discoverable POST method.
Documentation is extremely sparse. The provider's docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and no example payloads. The actual shape of the liquidity data returned after successful payment is unknown from available materials.
Capabilities
Use cases
- —Querying real-time XMR liquidity across DeFi protocols
- —Building trading bots that need Monero liquidity snapshots
- —Monitoring DeFi pool depth for XMR pairs
- —Integrating XMR liquidity checks into portfolio dashboards
Fit
Best for
- —Agents or bots needing on-demand XMR liquidity data without API key management
- —Developers prototyping DeFi dashboards who want instant pay-per-call access
- —Automated trading systems that need low-friction crypto data endpoints
Not for
- —Users who need detailed API documentation or guaranteed response schemas before integrating
- —High-volume consumers who would benefit from subscription-based bulk pricing
- —Anyone needing historical XMR liquidity time-series (no evidence this is supported)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/defi/XMR/liquidity \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, there is no documentation, no request/response schema, no examples, and this specific endpoint is not even listed on the provider's own landing page. The docs/pricing/README pages are all blank beyond a wallet-connect prompt. Effectively a stub listing.
Warnings
- —This specific endpoint (/api/v1/defi/XMR/liquidity) is not listed among the provider's advertised APIs on the landing page
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content
- —No request body schema or response schema is available — the data format returned after payment is unknown
- —No OpenAPI specification or ai-plugin manifest found
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base networkhttps://lowpaymentfee.com/api/v1/defi/XMR/liquidity
- —The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Documentation, API, pricing, and README pages all show only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs