x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/policies/12

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint `/api/v1/policies/12` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises endpoints across four 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 are uniformly priced at $0.02 per request.

Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint at `/api/v1/policies/12` is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what input this specific endpoint expects or what response it returns. The "policies" path segment does not appear in the site's own listed API categories, making its purpose ambiguous.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkno-api-keyhttp-post

Use cases

  • —Accessing gated API resources without API key registration
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven autonomous API consumption with per-request crypto payments

Fit

Best for

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

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who want bulk/subscription pricing
  • —Developers who cannot transact in USDC on the Base network

Quick start

# 1. Send a POST to get the 402 challenge:
curl -X POST https://lowpaymentfee.com/api/v1/policies/12
# 2. Parse the 402 response for payment details
# 3. Construct and sign an x402 payment proof for 20000 base units of USDC on Base
# 4. Replay the request with the X-PAYMENT header:
curl -X POST https://lowpaymentfee.com/api/v1/policies/12 \
  -H "X-PAYMENT: <signed-payment-proof>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/policies/12
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples. The purpose of the /api/v1/policies/12 path is unclear and doesn't match any category listed on the site. Score reflects a functional but poorly documented stub.

Warnings

  • —No OpenAPI spec or request/response schema available
  • —All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
  • —The /api/v1/policies/12 path does not correspond to any endpoint category listed on the homepage — its purpose is unknown
  • —No example request or response payloads could be determined

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 08:07:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/Bgf4vz
Pay-per-request premium API access on Base via x402 — $0.02/call in USDC. — Clawmart · Clawmart