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SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them. Call this BEFORE your agent pays anyone: before settling an x402 402 challenge, before agent checkout, or before sending funds to a new wallet or merchant. One cent buys a sanctio…
Wellknown found it in public sources; nobody has proven control of it yet. Claiming takes one click if the repository is under your GitHub account, or a small file on your domain otherwise. Verified owners get the badge, 15-minute checks, status alerts, edits that outrank crawled data, and a ranking boost.
Agents can do it too: POST https://wellknown.network/api/v1/claims with {"agent":"spendpreflight-spendpreflight","method":"well_known_file"} — machine-readable steps at claim.json, guide at /docs/claim.
Everything here was measured by our prober or read from a registry. Nothing is self-reported.
30-day availability2/2 checks ok
30 days agotoday
Endpoints
https://api.spendpreflight.coma2a · auth: none · checked on a schedule
Registry facts
Not distributed through a package registry we index.
when
check
result
http
latency
detail
6 h ago
a2a card
ok
200
41 ms
card: SpendPreflight · 13 skills
14 h ago
a2a card
ok
200
25 ms
card: SpendPreflight · 13 skills
Declared by sources
What the publisher says
Attributed to the source that supplied each field. Treated as claims, not facts.
SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them. Call this BEFORE your agent pays anyone: before settling an x402 402 challenge, before agent checkout, or before sending funds to a new wallet or merchant. One cent buys a sanctions screen and a new-domain check; two cents buys an allow/hold/block decision against your spending rules with a loggable receipt.
Bazaar Listing Guard — Bazaar Listing Guard: CDP technical validation plus a bounded heuristic metadata screen for agent-directed instructions, embedded URLs, tool calls, invisible Unicode, long fields and prices above 100x a fresh Scout category median. Returns riskScore, flagged spans and rewrite suggestions. Not Coinbase policy certification or guaranteed detection. Public HTTPS only; no target payment or request bodies stored.
FillPoint archived stations — Nearest RV dump/water stations from FillPoint RV's dated September 17, 2026 ODbL snapshot. $0.01 for bounded straight-line proximity calculation, not live access, potable-water assurance or road routing. Snapshot age and unknown current conditions are explicit. Full underlying projection is free under ODbL.
ERC-8478 Draft Payee Verification — ERC-8478 Draft payee verification: endpoint origin and ERC-8004 agent wallet or EIP-712 delegation at one pinned registry block. Nine explicit outcomes; not-read is uncharged. Signed JSON observation, not payment approval or a safety guarantee. Shared trial may apply.
Domain email-auth DNS observations — Observe a public domain’s MX, SPF, direct DMARC record, supplied DKIM selectors and resolver-reported DNSSEC evidence.0.005 USDC per usable report, no shared trial. Fixed public Cloudflare DoH only, at most7 queries/shared8s/128KiB, no SMTP, sender authentication test, DNS changes or query storage. Missing selectors and inherited DMARC policy stay unknown. Published records and resolver AD are not proof of inbox delivery, alignment, DNSSEC validation by this service or a secure domain.
x402 Seller Index — Search cached public x402 sellers. First three matches free; up to12 cost0.01 USDC only with extra matches. Bounded unpaid availability, 402, quote history and public Lint evidence; missing evidence unknown. Partial Base USDC wash-activity heuristic: low/elevated/unknown, coverage and reasons. Elevated subtracts10 ordering points without excluding sellers. No target request, safety or paid-delivery guarantee.
Historical Quote Check — Compare a supplied x402 quote with the latest comparable cached public unpaid quote and disclosed retained history. Scout keeps only the latest probe; the separate public index can retain seven days. $0.001 USDC on Base for a usable comparison, no trial. Missing/stale/ambiguous evidence returns unknown without charge. Never fetches or pays the target. Informational historical comparison, not payment approval or loss prevention.
x402 Security Check
kind ← A2A Agent Card
name ← A2A Agent Card
summary ← A2A Agent Card
version ← A2A Agent Card
description ← A2A Agent Card
homepageUrl ← A2A Agent Card
publisherUrl ← A2A Agent Card
publisherName ← A2A Agent Card
Derived by Wellknown
Capabilities
Mapped onto the structured taxonomy from declared text and observed tool names. Confidence shown for derived entries.
17 h ago · declared · summary → "SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them.
17 h ago · declared · description → "SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them.
17 h ago · declared · publisherName → "SpendPreflight"
17 h ago · declared · publisherUrl → "https://spendpreflight.com"
17 h ago · declared · homepageUrl → "https://api.spendpreflight.com/openapi.json"
— x402 Security Check (Lint Pro). Detailed passive findings and source-linked fixes from an existing, unexpired free Lint report. $0.10 USDC on Base, no trial or automatic payment. No new target request. Resource binding is advertised only; paid-response caching, replay/idempotency, header parser behavior and settlement-before-delivery remain unknown. Not an audit or safety guarantee.
payment_receipt — Verify a native Base USDC transfer by tx_hash (optional log_index), or exact pay_to + decimal amount + past start/end (max 90 days). Ambiguous matches fail without charge. Signed observation, OFAC flags, confirmations and printable HTML. Not invoice ownership or finality proof.
wallet_statement — Export native Base USDC wallet transfers as JSON or CSV for a past range up to 90 days, start inclusive/end exclusive. Exact decimal running balances, counterparties and OFAC flags. Up to 1000 transfers/128 RPC calls/25 seconds; oversized or unavailable historical data fails without charge. Informational, not tax advice.
Wattpath solar sizing — Off-grid PV energy-balance estimate based on Wattpath by Nomad Energy Club. Supply daily loads, peak sun hours, PV losses, and optional battery assumptions. No location/weather lookup, electrical design, surge or installation certification. $0.02 per calculation; no stored inputs.
Base contract safety signals — Base contract safety signals from bounded public-chain reads and OFAC. Basic: deployed bytecode and SDN match. Deep adds standard owner(), paused(), totalSupply(), decimals() and ERC-1967 storage observations, exact ERC-1167 minimal-proxy target detection, a Sourcify runtime-verification claim matched to current bytecode, and direct-deployment age when independently supported by the creation receipt. Honeypot/sellability, liquidity locks, holder concentration and scam lists are NOT assessed. Mi…
Check payee — Payee risk check. Screens a payee wallet address and name against the OFAC SDN sanctions list and checks the merchant domain's registration age and DNS. Returns risk low|medium|high|unknown with flags such as sanctioned_address, sanctioned_name_possible, new_domain. Use before paying an unfamiliar merchant or wallet.
Preflight payment — Spend preflight for AI agents. Send the x402 PaymentRequired body (v1 or v2) you received, or a cart, plus optional rules (per-payment max, hold threshold, daily cap, allowlists, new-domain days, endpoint category price multiple, liveness and payTo changes). Returns allow|hold|block with reasons, the cheapest acceptable payment option, and a receipt id. Read-only: never signs, settles, or holds funds. Use before every payment.