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/89

What it does

lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The platform advertises a flat rate of $0.02 per request across all listed endpoints, with no API keys, no rate limits, and no minimum commitments required.

The specific endpoint at `/api/v1/inbox/89` is listed as "Premium API Access" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. However, the exact functionality of this particular `/inbox/89` route is not documented — the site's landing page lists categories like analytics, AI, finance, and utilities but does not mention an "inbox" path. It is unclear what data or service this specific endpoint provides.

The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation beyond the landing page is sparse; the /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no additional technical details.

Capabilities

x402-paymentusdc-basepay-per-requestjson-responsepost-methodno-api-key

Use cases

  • —Accessing pay-per-request API services without API key management
  • —Making micropayment-gated API calls settled in USDC on Base
  • —Integrating x402-compatible endpoints into agent workflows

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents with x402 payment capability on Base
  • —Projects needing low-cost per-call pricing without subscriptions

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume use cases where per-request pricing may add up versus flat-rate plans
  • —Anyone without USDC on Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/89 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/89
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/inbox/89 is undocumented. No OpenAPI spec, no request/response schema, and no examples are available. The site's documentation pages are empty beyond a wallet-connect prompt. The purpose of this particular 'inbox' endpoint is unclear.

Warnings

  • —The specific endpoint /api/v1/inbox/89 is not listed among the documented APIs on the landing page — its purpose is unknown.
  • —No OpenAPI spec, request schema, or response schema is available for any endpoint.
  • —Documentation pages (/api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.
  • —The broader platform lists many endpoint categories but provides no technical details on request/response formats.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:21:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/4uA7W9
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart