Utility API / Base mainnet

FETCHX402

Pay per request. Get the answer.

Network utilities for agents — DNS today, SSL and WHOIS next — settled in USDC on Base via x402. No accounts. No third-party data wrappers. Fail closed on uncertain settlement.

See tools OpenAPI

Catalog

Tools that settle.

Prices are USDC on Base. Live amounts come from the machine-readable catalog — not this page.

01 / LIVE

DNS Explorer

Resolve A, AAAA, MX, TXT, CNAME, NS, and SOA against public recursive resolvers. Executed on our nodes — not a wrapped WHOIS/DNS SaaS.

$0.005 USDC

GET /v1/tools/dns

02 / NEXT

SSL Inspector

Certificate validity, issuer, SANs, and expiry windows for automated checks.

Soon

GET /v1/tools/ssl-check

03 / PLANNED

WHOIS Intelligence

Registration status and nameservers via direct port-43 queries.

Soon

GET /v1/tools/whois

x402 handshake

Four steps.
One settlement.

Same protocol family as Fetch402. Here we sell the utility; there we verify the market.

01 / Probe

Ask unpaid

GET the resource. Receive HTTP 402 with a base64 PAYMENT-REQUIRED challenge.

02 / Authorize

Sign off-chain

EIP-3009 transferWithAuthorization for the quoted USDC amount on Base.

03 / Settle

Confirm first

Retry with PAYMENT-SIGNATURE. We settle via CDP before any tool work.

04 / Execute

Return evidence

JSON body plus PAYMENT-RESPONSE with settlement details.

Operations

Evidence over polish.

Sister product to Fetch402. Same company standards: measured claims, fail-closed money paths.

01 / ISOLATION

Bounded execution

Timeouts + concurrency caps

02 / LEDGER

Payment integrity

Persist every settle attempt

03 / SCOPE

No analytics product

Ops truth only

API host https://api.fetchx402.com · smoke GET /v1/tools/ping ($0.001)