NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint serves NFT metadata for token ID 23 via the x402 payment protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The endpoint is part of a broader platform at lowpaymentfee.com that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The specific endpoint at /api/v1/nfts/23/metadata appears to be an NFT-related resource, though detailed documentation about the response schema or the NFT collection it references is not available from the crawled material.
The x402 challenge was successfully captured (HTTP 402 with valid accepts array), confirming the endpoint is live. The payment is routed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. No OpenAPI spec, detailed docs, or example responses were found during the crawl.
Capabilities
Use cases
- —Retrieving metadata for NFT token ID 23 from this collection
- —Integrating NFT metadata lookups into agent workflows with micropayments
- —Demonstrating x402 payment protocol usage on Base
Fit
Best for
- —Agents needing NFT metadata with no API key setup
- —Developers experimenting with x402 micropayment protocol
- —Low-friction, pay-as-you-go NFT data access
Not for
- —Bulk NFT metadata retrieval across many collections (only serves token 23 at this path)
- —Users who need detailed documentation or response schema guarantees
- —Free-tier or subscription-based access patterns
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/23/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema documentation, no example responses, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The specific NFT collection and response format are unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —No example response or detailed field descriptions found
- —The endpoint serves metadata for a single NFT token ID (23); unclear if other token IDs are available at similar paths
- —Crawled /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'
Citations
- —Endpoint returns HTTP 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/nfts/23/metadata
- —Payment is in USDC on Base network at max 20,000 base units ($0.02)https://lowpaymentfee.com/api/v1/nfts/23/metadata
- —Platform advertises $0.02/request pricing with no API keys, no rate limitshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/23/metadata