x402basequality 0.35

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/99/metadata

What it does

This endpoint serves NFT metadata for token ID 99 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 — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required; access is gated entirely by the x402 micropayment challenge.

The endpoint is part of a broader suite of pay-per-call APIs hosted at lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. This specific endpoint (/api/v1/nfts/99/metadata) appears to be an NFT metadata service, though the exact schema of the returned metadata (e.g., whether it follows ERC-721 metadata standards with name, description, image, and attributes fields) is not documented.

The x402 challenge was successfully captured with version 1, confirming the endpoint is live. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the maximum timeout for payment settlement is 300 seconds. No OpenAPI spec, detailed documentation, or example responses were found in the crawl.

Capabilities

nft-metadatax402-paymentusdc-settlementbase-networkpay-per-calljson-response

Use cases

  • —Retrieving metadata for NFT token ID 99 programmatically
  • —Integrating NFT display data into wallets or marketplaces
  • —Agent-driven NFT data lookup with automatic micropayment

Fit

Best for

  • —Agents needing on-demand NFT metadata without API key management
  • —Developers testing x402 micropayment flows on Base
  • —Low-volume NFT metadata lookups at $0.02 per call

Not for

  • —Bulk NFT metadata retrieval across many token IDs (only token 99 is exposed at this URL)
  • —Users who need free or subscription-based access rather than per-call payment

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/99/metadata \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/99/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation of request/response schemas, no example responses, and the endpoint is scoped to a single NFT token ID. The broader site offers many endpoints but none are documented beyond titles and prices.

Warnings

  • —No OpenAPI or schema documentation available for request or response bodies
  • —Endpoint is scoped to a single NFT token ID (99); unclear if other token IDs are available at different paths
  • —No example responses found — actual metadata structure is unknown
  • —Site pages beyond the landing page returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:48:47Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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