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/129

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 paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.

The specific endpoint at `/api/v1/inbox/129` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a uniform $0.02/request pricing across all listed endpoints.

The broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available for any of these endpoints, including the inbox/129 endpoint. The purpose of the "inbox/129" path specifically is unclear — it does not map to any of the named endpoints on the landing page.

Capabilities

x402-paymentper-request-billingusdc-basepost-endpointno-api-keypay-per-use

Use cases

  • —Accessing premium API functionality with per-request USDC micropayments on Base
  • —Agent-driven workflows that need keyless, on-demand API access
  • —Prototyping integrations without subscription commitments

Fit

Best for

  • —Developers wanting zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto-native micropayments over traditional billing

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who would benefit from bulk/subscription pricing
  • —Anyone without a Base-compatible USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/129 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/129
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the specific purpose of /api/v1/inbox/129 is undocumented. The crawled pages beyond the landing page returned only wallet-connect stubs with no useful content.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint
  • —The path /api/v1/inbox/129 does not correspond to any named endpoint on the landing page — its specific functionality is unknown
  • —No example request or response payloads are documented
  • —Crawled /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 21:32:56Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/RbXXs5
Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart