NFT collection floor-price lookup via x402 micropayment on Base, $0.02 per request.
What it does
This endpoint returns floor-price data for NFT collection ID 21 via the x402 payment protocol on the Base network. It is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, all priced at $0.02 per request and settled in USDC on Base. No API keys or accounts are required — callers authenticate and pay by attaching an X-PAYMENT header with a valid x402 payment proof.
The specific path `/api/v1/collections/21/floor` is not listed on the provider's landing page, which instead showcases categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. The collections/floor endpoint appears to be an NFT-related data endpoint, likely returning the current floor price for a specific collection. The response MIME type is `application/json`.
The provider advertises simple, flat pricing ($0.02 per request), no rate limits, and no minimum commitments. The x402 challenge confirms the endpoint is live, accepting POST requests, settling via the "exact" scheme in USDC (contract `0x8335…2913`) on Base mainnet. The maximum amount required is 20,000 base units of USDC (6 decimals), which equals $0.02.
Capabilities
Use cases
- —Retrieve the current floor price for a specific NFT collection programmatically
- —Build trading bots or dashboards that monitor NFT floor prices
- —Integrate NFT floor-price checks into agent workflows without managing API keys
Fit
Best for
- —Agents or bots needing on-demand NFT floor-price data with no signup
- —Developers who want to pay per call in USDC on Base without subscriptions
- —Automated pipelines that need simple, keyless API access to NFT market data
Not for
- —High-volume bulk NFT data ingestion where per-call pricing becomes expensive
- —Users who need historical floor-price time series (no evidence this endpoint provides that)
- —Non-crypto users who cannot generate x402 payment proofs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/collections/21/floor \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the specific collections/floor endpoint is not even listed on the provider's own landing page. The docs, pricing, and API pages all returned only 'Connect wallet' with no useful content.
Warnings
- —The endpoint path /api/v1/collections/21/floor is not listed among the provider's advertised APIs — it may be undocumented or experimental.
- —No request or response schema is available; the actual data returned is unknown.
- —All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content.
- —Collection ID 21 is hardcoded in the path; it is unclear what collection this refers to or how to discover other collection IDs.
Citations
- —The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/collections/21/floor
- —The provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/collections/21/floor
- —maxAmountRequired is 20000 base units (USDC 6 decimals = $0.02)https://lowpaymentfee.com/api/v1/collections/21/floor