x402-research-iota.vercel.app — agent-tools.cloud

Paid verification

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B+ 66.5 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 402)

Payability 15.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 7.5 / 35

9 distinct payers, 25 USDC transfers in the last 30 days; the wallet is shared by 3 listings, so each is credited 1/3

Performance 10.0 / 10

Last probe answered in 147 ms (full marks at 200 ms or less)

Readiness 14.0 / 15

Agent readiness 93/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 20 h ago. On-chain activity last read 3 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

A · 93/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here B+, 66.5/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	25/25	Paid endpoint answers with an HTTP 402 challenge (147 ms).
x402 version	n/a	x402 version not observed yet.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	18/18 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 9 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 75 points, scaled to 100.

Responsiveness: Responsive (147 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest. Qualifies the payment claim; adds no points.

Measured 2026-11-11.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

Compared with peers

Against 10,082 reachable x402 APIs in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.

Readiness: Higher than 94% of peers; This listing 93 · peer median 78
Latency: Faster than 69% of peers; This listing 147 ms · peer median 205 ms

Where it loses the most points, and how to win them back

Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.

How many agent tools actually work · All statistics

Paid endpoints

9 resource(s) advertised by this origin. Each price below is that resource's own x402 price; the headline price is the range across them.

GET https://x402-research-iota.vercel.app/api/brief/[asset] $0.0300 / call

Technical + sentiment research brief (price, 24h/7d change, RSI14, SMA20/50, trend, Fear & Greed). Assets: btc,eth,sol,xrp,doge,ada,avax,link,dot,ltc,bch,uni,aave,xlm,hbar,shib,sui,near,atom,fil

GET https://x402-research-iota.vercel.app/api/signal/[asset] $0.0030 / call

Compact trend signal (bullish/neutral/bearish + score). Assets: btc,eth,sol,xrp,doge,ada,avax,link,dot,ltc,bch,uni,aave,xlm,hbar,shib,sui,near,atom,fil. Free delayed sample: /api/sample/signal

GET https://x402-research-iota.vercel.app/api/signal-batch $0.0200 / call

Live trend signals for up to 10 assets in one call, flat price regardless of count. Pass ?assets=btc,eth,... from: btc,eth,sol,xrp,doge,ada,avax,link,dot,ltc,bch,uni,aave,xlm,hbar,shib,sui,near,atom,fil. Errors (before payment): 400 missing/unsupported/too many assets.

GET https://x402-research-iota.vercel.app/api/firm/risk-snapshot $0.0300 / call

Use before interacting with an unfamiliar Base (chain 8453) address: returns a public-data red-flag snapshot (contract vs EOA, EIP-7702 delegation, source verification, upgradeable proxy, age, activity, ETH/USDC balance, risk level). Pass ?address=0x... Errors: 400 invalid address. Informational onl

GET|POST https://x402-research-iota.vercel.app/api/x402/invoice-policy $0.0200 / call

Before you sign an x402 invoice, send the payment requirements plus your policy (max amount, allowed assets, allowed networks, payTo allow and deny, timeout). Returns allow, review, or block with plain-language reasons. Invalid or ambiguous input never allows. Free sample: /api/x402/invoice-policy/s

GET|POST https://x402-research-iota.vercel.app/api/x402/invoice-decode $0.0200 / call

Use before paying any x402 invoice: decodes a base64 PAYMENT-REQUIRED header (query ?header= or JSON body {header}) and checks scheme exact, Base mainnet, Base USDC asset, payTo (EOA/contract/EIP-7702), human amount, timeout; returns verdict ok/warn/fail with reasons. Errors: 400 invalid header. Rea

GET https://x402-research-iota.vercel.app/api/x402/settlement-status $0.0200 / call

Check an x402 settlement on Base (chain 8453): tx exists/succeeded, USDC Transfer and AuthorizationUsed events (from, to, amount), confirmations. Pass ?tx=0x... Errors: 400 invalid tx hash. Read-only.

GET https://x402-research-iota.vercel.app/api/x402/approval-enumerate $0.0300 / call

List live ERC-20 approvals for a Base (8453) address: token, spender, current allowance, unlimited flag. status ok (complete, approvals found) / none (complete, zero active) / unknown (data incomplete; reason given; never reported as none). Pass ?address=0x... Errors: 400 invalid address; 503 indexe

GET https://x402-research-iota.vercel.app/api/x402/preflight $0.0500 / call

One-call Base (8453) preflight: risk snapshot + live ERC-20 approvals + OFAC SDN screen + optional x402 invoice check (?invoice= JSON or base64). Returns risk, approvals, invoice, sanctions and summary {verdict proceed|review|stop, flags}. Free sample: /api/preflight/sample. 400 bad input; 503 not c

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://x402-research-iota.vercel.app/api/signal-batch  # expect HTTP 402 Payment Required (about 0.003 USDC/call)

/.well-known/x402.json

https://x402-research-iota.vercel.app/.well-known/x402

Listed in

Directories this entry was found in.

x402 since 2026-10-26