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/69/metadata

What it does

This x402-enabled endpoint at lowpaymentfee.com returns NFT metadata for token ID 69 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, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated purely by the x402 payment header.

The provider's landing page lists a broad catalog of pay-per-call APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints are priced at $0.02 per request and settle on Base. However, this specific listing covers only the NFT metadata endpoint at /api/v1/nfts/69/metadata.

Documentation is minimal — no OpenAPI spec, no request/response schema, and no example payloads are provided. The endpoint is confirmed live (returns a proper 402 challenge), but the actual structure of the metadata response is unknown. Callers should expect a JSON response (mimeType is application/json) but will need to discover the exact schema experimentally.

Capabilities

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

Use cases

  • —Retrieve on-chain NFT metadata for token ID 69 without needing an API key
  • —Integrate NFT metadata lookups into agent workflows with automatic micropayments
  • —Demonstrate x402 payment protocol usage on the Base network

Fit

Best for

  • —Developers experimenting with x402 pay-per-call protocols
  • —Agents that need NFT metadata with no subscription or key management
  • —Low-volume, on-demand NFT data retrieval

Not for

  • —Bulk NFT metadata retrieval across many token IDs (only token 69 is exposed at this path)
  • —Users who need detailed documentation or guaranteed SLAs
  • —Free-tier or non-crypto payment workflows

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/69/metadata \
  -H "X-PAYMENT: <x402_payment_header>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/69/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live with a valid 402 challenge and clear pricing, but there is no OpenAPI spec, no request/response schema, no example payloads, and no documentation beyond the landing page listing. The actual content returned by this NFT metadata endpoint is entirely unknown.

Warnings

  • —No OpenAPI or schema documentation available — request and response formats are undocumented.
  • —Only token ID 69 is addressed by this specific endpoint path; it is unclear whether other token IDs are supported at different paths.
  • —Landing page lists many API categories but crawled sub-pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:45:46Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/2V3yT6
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart