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 56 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 infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (/api/v1/nfts/56/metadata) is focused on returning metadata for a particular NFT. The exact schema of the returned metadata is not documented, so callers should expect a standard JSON metadata object (likely following common NFT metadata conventions such as name, description, image, and attributes), though this is inferred rather than confirmed.
The endpoint was confirmed live via a 402 challenge response. The x402 version is 1, the payment scheme is "exact", and the maximum timeout is 300 seconds. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.
Capabilities
Use cases
- —Fetching metadata for NFT token #56 in an automated agent workflow
- —Integrating NFT display data into a dApp or marketplace without managing API keys
- —Programmatic access to NFT metadata with micropayment settlement on Base
Fit
Best for
- —Agents or bots that need on-demand NFT metadata without subscription overhead
- —Developers building on Base who want frictionless pay-per-call access
- —Low-volume or sporadic NFT metadata lookups where $0.02/call is cost-effective
Not for
- —Bulk retrieval of metadata for large NFT collections (no batch endpoint documented)
- —Use cases requiring metadata for arbitrary token IDs (this endpoint is scoped to token 56)
- —Users who need free or subscription-based access rather than per-call crypto payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/56/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request body or response format, and no examples. The NFT metadata content and structure are entirely inferred. The crawled pages beyond the homepage returned only 'Connect wallet' with no additional documentation.
Warnings
- —No response schema or example documented — the structure of the returned NFT metadata is unknown.
- —Endpoint is scoped to a single NFT token ID (56); unclear if other token IDs are available at similar paths.
- —No request body schema documented; it is unknown whether a POST body is required or what fields it accepts.
- —Crawled documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.
Citations
- —The endpoint returns a 402 challenge with x402Version 1, scheme 'exact', on Base network, with maxAmountRequired 20000 in USDC.https://lowpaymentfee.com/api/v1/nfts/56/metadata
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/nfts/56/metadata
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com