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/4/metadata

What it does

This x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 4 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.

The provider's landing page advertises a broad suite of pay-per-request 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 are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing covers only the `/api/v1/nfts/4/metadata` endpoint, which returns NFT metadata in JSON format.

The endpoint is confirmed live — the probe received a proper HTTP 402 challenge with x402 version 1 headers. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The exact structure of the returned NFT metadata is unknown, so consumers should expect a standard JSON metadata object but verify the response shape at runtime.

Capabilities

nft-metadatax402-paymentusdc-settlementbase-networkpay-per-requestno-api-key

Use cases

  • —Retrieving metadata for a specific NFT (token ID 4) programmatically
  • —Integrating NFT metadata into a dApp or marketplace without managing API keys
  • —Demonstrating x402 micropayment-gated API access on Base

Fit

Best for

  • —Developers needing on-demand NFT metadata without subscription overhead
  • —Agents or bots that can settle USDC payments on Base automatically
  • —Prototyping x402 payment flows with a low-cost endpoint

Not for

  • —Bulk retrieval of metadata across many NFT collections (only token ID 4 is exposed at this path)
  • —Users who cannot transact USDC on the Base network
  • —Production systems requiring documented response schemas and SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/4/metadata \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/4/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no example payloads, and no detailed documentation beyond the landing page listing. The specific NFT metadata content is entirely unknown.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —Response structure for NFT metadata is undocumented — consumers must discover it empirically
  • —Only token ID 4 is served at this specific path; generalizability to other token IDs is unclear
  • —Provider site pages beyond the landing page returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:23:57Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/pW9nxu
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart