x402basequality 0.30

Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/28

What it does

lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/28` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.

The wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. The platform claims no rate limits and no minimum commitments.

Important caveat: the specific `/api/v1/inbox/28` endpoint's description is simply "Premium API Access" with no further documentation about what it actually returns. There is no OpenAPI schema, no example request/response payloads, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 x402 challenge), but its actual functionality behind the paywall is unknown.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keyhttp-post

Use cases

  • —Agents needing on-demand API access without managing API keys or subscriptions
  • —Programmatic access to utility or data endpoints with per-call USDC micropayments
  • —Testing x402 protocol integrations against a live endpoint

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —Agents that need keyless, pay-as-you-go API access on Base
  • —Low-volume or sporadic API consumers who want no commitments

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before paying
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Anyone without USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <signed-x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/28
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what /api/v1/inbox/28 actually does or returns. No OpenAPI spec, no example payloads, and the crawled pages beyond the homepage are empty wallet-connect stubs. The listing is effectively a stub with only pricing and protocol details known.

Warnings

  • —No documentation exists for what /api/v1/inbox/28 actually returns — 'Premium API Access' is the only description
  • —No OpenAPI schema or example request/response available
  • —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content
  • —The specific functionality behind this endpoint is completely unknown without paying

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:45:52Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/b6PV6S
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart