x402basequality 0.30

Pay-per-call API platform on Base (USDC) covering 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/155

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/155` is listed as "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate purely via the x402 payment header.

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 endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.

The `/api/v1/inbox/155` endpoint itself lacks detailed documentation — there is no OpenAPI schema, no example request/response, and the crawled docs pages (pricing, README, API) all resolve to a wallet-connect prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown from available materials.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpoint

Use cases

  • —Programmatic access to a generic premium API endpoint via x402 micropayments
  • —Agent-driven API consumption without pre-registration or API keys
  • —Testing x402 payment flows on Base with low-cost USDC transactions

Fit

Best for

  • —Developers experimenting with x402 payment protocol
  • —AI agents needing keyless, pay-per-call API access
  • —Low-cost micropayment API consumption on Base

Not for

  • —Users who need detailed API documentation or guaranteed SLAs
  • —Applications requiring well-defined request/response schemas before integration

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/155 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/155
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI schema, no documented request/response format, and the specific purpose of /api/v1/inbox/155 is entirely unclear. The crawled docs pages are empty beyond wallet-connect prompts. This is effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —The specific function of /api/v1/inbox/155 ('Premium API Access') is undocumented — it is unclear what data or service it provides
  • —All documentation pages (/api, /pricing, /README) returned only a wallet-connect prompt with no useful content
  • —No example requests or responses are available to verify endpoint behavior

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:39:38Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/UAaF6w
Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart