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Listed on the Coinbase x402 Bazaar

AgentGate check-agent

Checks whether an AI agent is registered in the Concordium Agent Registry (CIS-8004), Active, and Verified by Concordium (its Agent Card hash matches on-chain). Input: a badge (CIS-2 token address) or a Concordium account.

Price

$0.005 USDC per call on Base

Endpoint

GET https://api.youraitools.co/agentgate/v1/check-agent

Also at

https://agentgate.agentgate.workers.dev/

Scheme

exact (x402 v2)

Pays to

0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

Facilitator

https://api.cdp.coinbase.com/platform/v2/x402

Free tier

Free preview (verdict only) at /v1/check-agent/preview and an MCP server at /mcp, 20 requests/min per IP

Run locally

npx -y -p concordium-agentgate agentgate-mcp(stdio MCP server, free)

Probe

Unpaid GET returned HTTP 402 with a PAYMENT-REQUIRED header: x402 v2, scheme exact, network eip155:8453 (Base), amount 5000 (0.005 USDC), asset native USDC 0x8335…2913, payTo 0x3c1A…8d6F. Free preview endpoint returned a verdict. Checked 2026-10-21. Local stdio MCP server (npm 0.2.2, agentgate-mcp) tested 2026-10-21: tools/list returned check_agent. Re-checked 2026-10-21 ~8:30 PM ET on https://api.youraitools.co/agentgate: unpaid call returned 402 with the same amount and payTo, resource https://api.youraitools.co/agentgate/..., preview, openapi.json, /.well-known/x402 and remote MCP tools/list all OK; facilitator per the service manifest: Coinbase CDP.

x402 Bazaar

Listed in Coinbase's public x402 Bazaar discovery list at the endpoint above (checked 2026-10-21).

Listed on the Coinbase x402 Bazaar

WebRead (URL to Markdown)

Reads a public web page and returns clean Markdown for LLMs: main content only (no nav, ads or scripts), absolute links, and title/description/language metadata. Respects robots.txt. Only successful reads are charged.

Price

$0.002 USDC per call on Base

Endpoint

GET https://api.youraitools.co/webread/v1/read?url=<page>

Also at

https://webread.agentgate.workers.dev/

Scheme

exact (x402 v2; v1 clients also supported)

Pays to

0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

Facilitator

https://api.cdp.coinbase.com/platform/v2/x402

Free tier

Free preview (first 2,000 characters) at /v1/read/preview and a remote MCP server at /mcp (tool read_url), 10 requests/min per IP

Run locally

npx -y -p x402-url-to-markdown webread-mcp(stdio MCP server, free)

Probe

Unpaid GET /v1/read returned HTTP 402 with a PAYMENT-REQUIRED header: x402 v2, scheme exact, network eip155:8453 (Base), amount 2000 (0.002 USDC), asset native USDC 0x8335…2913, payTo 0x3c1A…8d6F. Free preview endpoint returned Markdown. Checked 2026-10-21. Local stdio MCP server (npm 0.1.3, webread-mcp) tested 2026-10-21: tools/list returned read_url and a call on example.com returned Markdown. Re-checked 2026-10-21 ~8:30 PM ET on https://api.youraitools.co/webread: unpaid call returned 402 with the same amount and payTo, resource https://api.youraitools.co/webread/..., preview, openapi.json, /.well-known/x402 and remote MCP tools/list all OK; facilitator per the service manifest: Coinbase CDP.

x402 Bazaar

Listed in Coinbase's public x402 Bazaar discovery list at the endpoint above (checked 2026-10-21).

Listed on the Coinbase x402 Bazaar

InjectScan (prompt-injection scanner)

Deterministic rule engine (92 public rules) that returns a 0-100 risk score, a verdict (safe, suspicious or malicious), categories and exact character spans. Scans text up to 100,000 characters, a public page including hidden HTML, or up to 100 MCP tool definitions for tool poisoning. Inputs are not stored. One defense layer, not a guarantee: see the published benchmark.

Price

$0.003 USDC per call on Base

Endpoint

GET or POST https://api.youraitools.co/injectscan/v1/scan

Also at

https://injectscan.agentgate.workers.dev/

Scheme

exact (x402 v2; v1 clients also supported)

Pays to

0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

Facilitator

https://api.cdp.coinbase.com/platform/v2/x402

Free tier

Free preview (text up to 2,000 characters, full result) at /v1/scan/preview and a remote MCP server at /mcp (tool scan_text), 10 requests/min per IP

Run locally

npx -y -p x402-prompt-injection-scan injectscan-mcp(stdio MCP server, free)

Probe

Unpaid GET and POST /v1/scan returned HTTP 402 with a PAYMENT-REQUIRED header: x402 v2, scheme exact, network eip155:8453 (Base), amount 3000 (0.003 USDC), asset native USDC 0x8335…2913, payTo 0x3c1A…8d6F. Free preview returned a full result, MCP tools/list returned scan_text, npm package 0.1.1 tested locally. Checked 2026-10-21. Local stdio MCP server (npm 0.1.3, injectscan-mcp) tested 2026-10-21: tools/list returned scan_text and a test injection was flagged malicious. Re-checked 2026-10-21 ~8:30 PM ET on https://api.youraitools.co/injectscan: unpaid call returned 402 with the same amount and payTo, resource https://api.youraitools.co/injectscan/..., preview, openapi.json, /.well-known/x402 and remote MCP tools/list all OK; facilitator per the service manifest: Coinbase CDP.

x402 Bazaar

Listed in Coinbase's public x402 Bazaar discovery list at the endpoint above (checked 2026-10-21).

Listed on the Coinbase x402 Bazaar

DomainCheck (domain & email checks)

Domain report: DNS, MX, SPF, DMARC, DKIM (10 common selectors), MTA-STS, RDAP registrar and age, parked flags, a 0-100 score and a verdict. Email check: syntax, canonical form, disposable, role and free-provider flags, MX deliverability and domain age. No SMTP mailbox probing. Inputs are not stored (per the service's policy). Two paid routes: /v1/domain $0.002 and /v1/email $0.001.

Price

$0.002 (domain) / $0.001 (email) USDC per call on Base

Endpoint

GET or POST https://api.youraitools.co/domaincheck/v1/domain?domain=<name>

Also at

https://domaincheck.agentgate.workers.dev/

Scheme

exact (x402 v2; v1 clients also supported)

Pays to

0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

Facilitator

https://api.cdp.coinbase.com/platform/v2/x402

Free tier

Free previews at /v1/domain/preview (DNS, MX, SPF, DMARC) and /v1/email/preview (syntax, disposable, role flags), and a remote MCP server at /mcp (tools check_domain, check_email), 10 requests/min per IP

Run locally

npx -y -p @agentgate-builder/domaincheck domaincheck-mcp(stdio MCP server, free)

Probe

Unpaid GET /v1/domain returned HTTP 402 with a PAYMENT-REQUIRED header: x402 v2, scheme exact, network eip155:8453 (Base), amount 2000 (0.002 USDC), asset native USDC 0x8335…2913, payTo 0x3c1A…8d6F; /v1/email asked for 1000 (0.001 USDC). Both previews, openapi.json, /.well-known/x402 and remote MCP tools/list worked. Local stdio MCP server (npm 0.1.1, domaincheck-mcp) tested: tools/list returned check_domain and check_email, and real calls returned scores. PayAI Bazaar listing-status: listed, alive. Checked 2026-10-21. Re-checked 2026-10-21 ~8:30 PM ET on https://api.youraitools.co/domaincheck: unpaid call returned 402 with the same amount and payTo, resource https://api.youraitools.co/domaincheck/..., preview, openapi.json, /.well-known/x402 and remote MCP tools/list all OK; facilitator per the service manifest: Coinbase CDP.

x402 Bazaar

Listed in Coinbase's public x402 Bazaar discovery list at the endpoint above (checked 2026-10-21).

Listed on the Coinbase x402 Bazaar

PayGuard (OFAC sanctions screening)

Checks a crypto address against every digital currency address in the US Treasury OFAC SDN list (list of 2026-10-21: 1,050 addresses across 106 SDN entries) and returns sanctioned true/false, plus, on the paid tier, the matching SDN entity, sanctions programs, list date and a checksum check. Batch of up to 50 for $0.01. Exact matching only; no EU, UK or UN lists and no on-chain exposure analysis.

Informational screening, not legal advice.

Price

$0.001 USDC per call on Base

Endpoint

GET or POST https://api.youraitools.co/payguard/v1/address?address=<addr>

Also at

https://payguard.agentgate.workers.dev/

Scheme

exact (x402 v2; v1 also accepted)

Pays to

0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F

Facilitator

https://api.cdp.coinbase.com/platform/v2/x402

Free tier

Free preview (sanctioned true/false, match count, chain guess) at /v1/preview and a remote MCP server at /mcp (tool screen_address), 10 requests/min per IP

Run locally

npx -y @agentgate-builder/payguard(stdio MCP server, free)

Probe

Unpaid GET /v1/address returned HTTP 402 with a PAYMENT-REQUIRED header: x402 v2, scheme exact, network eip155:8453 (Base), amount 1000 (0.001 USDC), asset native USDC 0x8335…2913, payTo 0x3c1A…8d6F; POST /v1/batch asked for 10000 (0.01 USDC); invalid input returned 400 without a payment request. Preview flagged the Lazarus Group address (sanctioned: true) and cleared the USDC contract; /v1/list showed 1,050 addresses, list date 2026-10-21; openapi.json, /.well-known/x402 and remote MCP tools/list (screen_address) OK. Local stdio MCP server (npm 0.1.0) tested: tools/list returned screen_address and screen_addresses, and a call named LAZARUS GROUP [DPRK3]. Checked 2026-10-21.

x402 Bazaar

Listed in Coinbase's public x402 Bazaar discovery list at the endpoint above (checked 2026-10-21).