Signalbound API — agent-tools.cloud

Signalbound API for agent metadata, reveal-aware token reads, ERC-8004 registration files, and holder-gated tool routes.

Paid verification

How it works

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+ 87.6 / 100

Availability 40.0 / 40

Endpoint responded (HTTP 402)

Payability 20.0 / 20

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

Demand 27.6 / 40

39 distinct payers, 11661 USDC transfers in the last 30 days

Owner verified 0.0 / 3

Nobody has claimed this listing yet

Endpoint last checked 5 h ago. On-chain activity last read 2 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 · 94/100

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+, 87.6/100), 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 (180 ms).
x402 version	10/10	Speaks x402 v2.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	15/15	32/32 probes succeeded over 30 days (100%).
Resource declaration	10/10	Declares 7 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 85 points, scaled to 100.

Responsiveness: Responsive (180 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, catalog_listing. 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. Display only: search order uses the quality grade.

Compared with peers

Against 10,060 reachable x402 APIs in our daily snapshot (2026-11-12 01:39 UTC). Display only; it does not change search order.

Readiness: Higher than 95% of peers; This listing 94 · peer median 78
Latency: Faster than 57% of peers; This listing 180 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

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

https://api.signalbound.art/allowlist-scan $0.0100 / call

Batch mint-eligibility scan: checks a wallet against upcoming and featured OpenSea drops and returns the ones it can actually mint, with stage, price and timing. Discounted rate for a wallet holding a Signalbound NFT (Rare+ holders); other callers use the open rate above.

https://api.signalbound.art/b20-radar $0.0100 / call

Radar for Base's native B20 token standard: newly deployed tokens from the factory precompile, plus market depth for any B20 address — price, 24h volume, liquidity and a thin-market risk read. Discounted rate for a wallet holding a Signalbound NFT (holders); other callers use the open rate above.

https://api.signalbound.art/drop-radar $0.0100 / call

Live NFT drop radar built on OpenSea: featured, upcoming and freshly minting drops on Ethereum and Base with stage pricing, supply, mint windows and direct mint links. Discounted rate for a wallet holding a Signalbound NFT (holders); other callers use the open rate above.

https://api.signalbound.art/intel $0.0100 / call

Onchain intelligence brief for a Signalbound agent: identity, rarity and clearance, unlocked capabilities, and a current signal read of the market it watches. Discounted rate for a wallet holding a Signalbound NFT (holders); other callers use the open rate above.

https://api.signalbound.art/offer-radar $0.0100 / call

Collection offer and listing radar: floor price, best listings and standing collection offers, ranked by opportunity — including bids sitting above floor. Discounted rate for a wallet holding a Signalbound NFT (Epic+ holders); other callers use the open rate above.

https://api.signalbound.art/portfolio $0.0100 / call

Wallet NFT portfolio analysis: holdings across collections, the offers currently standing against them, and estimated value from live OpenSea floors. Discounted rate for a wallet holding a Signalbound NFT (Rare+ holders); other callers use the open rate above.

https://api.signalbound.art/robinhood-radar $0.0100 / call

Radar for Robinhood Chain: the most active community tokens and tokenized assets with price, 24h volume, liquidity and a market-depth risk read, or a deep inspect of any single token. Discounted rate for a wallet holding a Signalbound NFT (Epic+ holders); other callers use the open rate above.

How to call

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

curl -sS -i -X GET https://api.signalbound.art/allowlist-scan  # expect HTTP 402 Payment Required (about $0.01/call)

/.well-known/x402.json

https://api.signalbound.art/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-09-13