x402basequality 0.35

Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/accounts/4

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no commitments required.

The specific endpoint at `/api/v1/accounts/4` is listed as "Premium API Access" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas for this and other endpoints are unknown. Without documentation or OpenAPI specs, callers will need to experiment to discover the expected input format and response structure.

Capabilities

x402-paymentusdc-basepay-per-requestjson-apipost-methodno-api-keyaccounts-endpoint

Use cases

  • —Accessing premium account data with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —Programmatic pay-as-you-go access to a multi-category API catalog

Fit

Best for

  • —Developers wanting zero-commitment, pay-per-use API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or OpenAPI schemas before integrating
  • —High-volume consumers who would benefit from bulk pricing or subscriptions
  • —Developers who cannot transact in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/accounts/4 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/accounts/4
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation (all doc pages are empty), no request/response schema, and no examples. The purpose of the /api/v1/accounts/4 endpoint specifically is unclear beyond the generic label "Premium API Access."

Warnings

  • —No API documentation available — all doc/pricing/README pages return only 'Connect wallet'
  • —No OpenAPI or schema definition for request or response payloads
  • —The specific purpose and expected input of /api/v1/accounts/4 is undocumented
  • —Cannot verify what data or functionality this endpoint actually provides

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 00:29:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/VF4zCU
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart