USDC · Base mainnet 8453
No recurring subscriptions. Choose pay-per-call or buy nonexpiring credits. No access method authorizes another automatically.
| Product | x402 / MPP per call | Current prepaid credits |
|---|---|---|
| Check | $0.005 USDC | 2 |
| Extract | $0.010 USDC | 3 |
| Smart Diff | $0.015 USDC | 4 |
| OpenAPI Contract Diff | $0.020 USDC | 5 |
One-time prepaid credits
$2.50 USDC
1,000 creditsTwo supported purchase paths; choose your product scope deliberately.
One-time prepaid credits
$15.00 USDC
10,000 creditsTwo supported purchase paths; choose your product scope deliberately.
Scope is part of your purchase. All-service packages cover all seven paid products after explicit terms acceptance and finalized eligible funding. Existing Web credits keep their original rights; they do not automatically cover blockchain. No wallet connection or quote authorizes payment.
All-service: starter-all-services-v4 and developer-all-services-v4. Web-only: candidate-starter-v3 and candidate-developer-v3. Prices and credits are the same within each tier; product eligibility differs.
Check 2 · Extract 3 · Smart Diff 4 · OpenAPI Contract Diff 5 credits. Eligible all-service blockchain costs: Contract Watch 4 · Wallet Watch 8 · Token Facts 4. Legacy accepted tariffs remain intact.
A payment-aware client reads the HTTP 402 challenge, verifies network, recipient and exact amount, then requests owner-approved USDC authorization. A 402 response is not a charge or a customer purchase.
The EVM charge method provides the same exact Base USDC operation through native MPP challenges and receipts. Preserve the original authorization and recovery evidence.
Visit the canonical account page to authenticate wallet ownership, obtain a purchase quote and complete an explicitly authorized package purchase. Issuing a paid API key requires the documented funding state. Finalized settlement determines full credit entitlement.
Discovery and baseline registration are free within rate and fetch budgets. The illustrative local demo needs no wallet. The separate machine trial requires an unfunded EOA ownership signature, no human CAPTCHA, and has its own limited allowances/shared capacity. Authenticated Web free trials are enabled within finite shared capacity; inspect current availability before assuming an allowance is active.
If a request or purchase times out, keep the original proof, funding intent, arguments and recovery key. Retry its documented recovery path; do not authorize a replacement payment because the response was delayed.
Legacy accounts keep their accepted tariffs and credits. Current plans do not retroactively reprice existing customer terms. Full limits, provisional-credit rules and refunds are in the approved terms. Circle Gateway remains disabled.
Payment integration guide →Contract Watch $0.010 · Wallet Watch $0.020 · Token Facts $0.010 USDC per call. All-service prepaid costs 4 / 8 / 4 credits respectively; a new all-service package requires explicit terms acceptance and finalized funding. Existing Web packages retain their original entitlements.
Bounded commercial pilot on Base mainnet. x402 and native MPP are available at the quoted per-call prices. New all-service Starter and Developer packages cover all seven paid tools after explicit all-service terms acceptance; existing Web credits keep their original rights and do not automatically gain blockchain access. Only finalized all-service credits fund blockchain calls. Human Web trials do not cover blockchain; the separate machine trial may admit one bounded observation within its shared18RPC/day cap. Finalized single-provider observations only, with finite shared daily capacity; no trading, safety score or complete history.
Tool reference →