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/11/metadata

What it does

This x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 11 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The advertised maximum cost per request is 20,000 base units of USDC, which equals $0.02 (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 provider's landing page lists a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints are priced uniformly at $0.02 per request. However, this specific listing covers only the `/api/v1/nfts/11/metadata` path, which returns NFT metadata in JSON format.

No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl. The endpoint is confirmed live (HTTP 402 challenge returned), but the actual structure of the metadata response and any required POST body fields are unknown. Callers should expect a JSON payload describing NFT #11's metadata, but the exact fields are unverified.

Capabilities

x402-paymentnft-metadatausdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Retrieving metadata for NFT token #11 from this provider
  • —Integrating pay-per-call NFT data into an agent workflow without managing API keys
  • —Demonstrating x402 micropayment protocol usage on Base

Fit

Best for

  • —Agents needing on-demand NFT metadata with no subscription
  • —Developers experimenting with x402 payment protocol on Base
  • —Low-volume, pay-as-you-go NFT data retrieval

Not for

  • —Bulk NFT metadata retrieval across many collections (only serves token 11 at this path)
  • —Users who need free or pre-paid API access without crypto wallets
  • —Production systems requiring documented, stable API schemas

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/11/metadata \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402_payment_proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/11/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

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 request/response examples, no documentation beyond a landing-page listing, and the endpoint serves metadata for a single hardcoded NFT ID with unknown response structure. Effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available — request body and response structure are unknown
  • —This endpoint path is hardcoded to NFT token ID 11; generalizability to other token IDs is unverified
  • —The broader API catalog on the landing page lists many endpoints but none have documented schemas
  • —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:18:06Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/jv8dap
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart