x402basequality 0.40

NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/nfts/21/metadata

What it does

This endpoint at lowpaymentfee.com serves NFT metadata for token ID 21 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.

The provider operates a broader platform offering dozens of pay-per-call 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 share the same $0.02/request pricing model and settle on the Base network using USDC.

This specific endpoint returns application/json content (as declared in the x402 challenge's mimeType field). The exact schema of the NFT metadata response is not documented, so callers should expect a standard NFT metadata JSON object but should handle unknown fields gracefully. The endpoint is live and returning a proper 402 challenge with x402 version 1.

Capabilities

nft-metadatax402-paymentusdc-settlementbase-networkpay-per-callno-api-keypost-endpoint

Use cases

  • —Retrieving on-chain NFT metadata for display in wallets or marketplaces
  • —Programmatic access to NFT attributes for indexing or analytics
  • —Agent-driven NFT data retrieval with automatic micropayment settlement

Fit

Best for

  • —Developers needing NFT metadata without managing API keys
  • —AI agents that can settle x402 payments autonomously
  • —Low-volume or sporadic NFT metadata lookups where per-call pricing is economical

Not for

  • —High-volume bulk NFT metadata scraping (no documented batch endpoint)
  • —Users who need metadata for arbitrary token IDs (this endpoint is scoped to token 21)

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/21/metadata \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/21/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.40/ 1.00

The endpoint is live and returns a valid x402 402 challenge with clear pricing and network info. However, there is no OpenAPI schema, no documented request/response body, no examples, and the NFT metadata content is entirely unknown. The endpoint is scoped to a single token ID with no broader documentation.

Warnings

  • —No OpenAPI or schema documentation available for request or response bodies
  • —Endpoint is scoped to a single NFT token ID (21); unclear if other token IDs are available at similar paths
  • —No crawled documentation beyond the landing page listing; /api, /pricing, and /README pages returned only a wallet-connect prompt
  • —The actual content returned by this NFT metadata endpoint is unknown — response structure is not documented

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:31:26Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Dqk57g
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart