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x402 Endpoint Risk Preflight
x402
x402 Endpoint Risk Preflight is a paid API for AI agents from x402-market-intel-mcp.mtree.workers.dev, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).
Analyzes an x402 payment-gated URL and returns a pay/avoid/cap verdict with live 402 probe results, hosted graph evidence, examples, and exact autopay stop conditions.
Price / call$0.2
Success—
StatusUnknown
How this service works
Topdog-shaped endpoint risk preflight: one x402 URL in, pay/avoid/cap verdict out with live 402 probe, hosted graph evidence, examples, and exact autopay stop conditions. Price 0.20 USDC on Base via x402. Free preview: https://x402-market-intel-mcp.mtree.workers.dev/preview/x402_endpoint_preflight?source=x402_manifest. Demo: https://x402-market-intel-mcp.mtree.workers.dev/demo/x402_endpoint_preflight. Contact: https://x402-market-intel-mcp.mtree.workers.dev/contact.
Output
Returns a structured verdict (pay / avoid / cap) for the submitted x402 URL, including results of a live 402 probe against the endpoint, graph-based evidence from hosted observations, comparable example endpoints, and precise conditions under which autopay should be halted.
Example use cases
Example prompt
“Before I let you autopay this endpoint, run a risk preflight on https://some-service.example.com/v1/paid-route and tell me whether I should pay, avoid, or cap it — and what the exact conditions are where you'd stop autopaying.”
Technical details
Endpoint
POSThttps://x402-market-intel-mcp.mtree.workers.dev/v1/x402/x402_endpoint_preflightWhen to prefer
Use this endpoint when an AI agent needs to decide whether to autonomously pay an x402-gated API before committing funds — especially for unknown or new endpoints. Prefer this over generic trust checks when you need a structured pay/avoid/cap verdict backed by live probe data and historical graph evidence specific to the x402 ecosystem.
Side effects
- Invalid or non-x402 URL submitted — returns error indicating URL is not a valid x402 resource
- Target endpoint unreachable during live probe — returns partial result with probe failure noted
- Insufficient graph data for the endpoint — verdict returned with low-confidence flag
- Payment of 0.20 USDC on Base not settled — request rejected with 402 response
- Malformed request body — returns 400 validation error
Input
{
"url": "https://example-api.service.com/v1/data/premium",
"method": "GET",
"resource": "premium_dataset",
"budget_usdc": 5
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"ok": true,
"score": 53,
"verdict": "manual_review_before_pay",
"examples": {
"request": {
"method": "GET",
"resource": "premium_dataset",
"budget_usdc": 5
},
"paid_retry_policy": {
"reject_if": [
"payTo changes",
"amount exceeds cap",
"resource binding mismatch",
"Payment-Required cannot be parsed"
],
"max_spend_usdc": 0,
"require_fresh_402": true,
"only_retry_same_method_url_body": true
}
},
"resource": "premium_dataset",
"freshness": {
"source": "live 402 probe + hosted CDP/PayAI graph",
"observed_at": "2026-06-05T23:54:01.000Z"
},
"risk_flags": [
"not_found_in_hosted_x402_graph",
"missing_or_zero_price",
"live_probe_failed"
],
"next_action": "Fix or verify flagged payment/schema/readback issues before autopay.",
"generated_at": "2026-06-05T23:54:01.000Z",
"payment_terms": {
"method": "GET",
"pay_to": null,
"network": "eip155:8453",
"resource": "premium_dataset",
"price_usdc": null,
"live_status": null,
"amount_atomic": null,
"resource_binding": "unknown",
"payment_required_parseable": false
},
"product_shape": "one_x402_url_in_pay_manual_review_or_avoid_policy_out",
"buyer_decision": {
"reason": "not_found_in_hosted_x402_graph, missing_or_zero_price, live_probe_failed",
"decision": "manual_review_before_pay",
"spend_cap_usdc": 0
},
"evidence_summary": {
"calls_30d": 0,
"has_schema": false,
"payers_30d": 0,
"registries": [],
"live_402_ok": false,
"has_examples": false,
"found_in_graph": false,
"dataset_fresh_at": null,
"revenue_30d_usdc": 0
},
"execution_policy": {
"verdict": "manual_review_before_pay",
"stop_conditions": [
"live unpaid route is not 402",
"Payment-Required header missing/unparseable",
"resource/payTo/amount mismatch",
"schema or examples missing for autonomous caller",
"no fresh registry/readback evidence for seller"
],
"required_followups": [
"run seller diagnostic fixes",
"re-register once",
"capture readback or exact blocker"
],
"max_autonomous_spend_usdc": 0
},
"payment_contract": {
"asset": null,
"method": "POST",
"pay_to": null,
"source": "indexed_registry_row",
"network": null,
"resource": "premium_dataset",
"price_usdc": null,
"amount_atomic": null,
"requested_resource": "premium_dataset",
"live_terms_verified": false,
"max_timeout_seconds": null,
"cache_control_no_store": null,
"registry_terms_available": false
},
"directory_submission_matrix": [
{
"status": "fix_first",
"blocker": "live unpaid route must return parseable x402 402 challenge",
"surface": "AgentCash / x402scan",
"proof_to_collect": "agentcash check/discover/register plus search readback",
"submit_or_readback_hint": "agentcash check premium_dataset --format json"
},
{
"status": "fix_first",
"blocker": "402index live probe expects x402, not L402, on paid routes",
"surface": "402index",
"proof_to_collect": "submit as protocol x402, then record listing/search readback",
"submit_or_readback_hint": "https://402index.io/?q=premium_dataset"
},
{
"status": "fix_first",
"blocker": "Bazaar quality drops without schemas and examples",
"surface": "Coinbase Bazaar / Agent402 Bazaar",
"proof_to_collect": "resource count, quality score, source=bazaar, payTo/domain readback",
"submit_or_readback_hint": "complete one CDP-facilitated settlement and expose Bazaar extension schema/examples"
},
{
"status": "fix_first",
"blocker": "live unpaid route must return parseable x402 402 challenge",
"surface": "x402gle / OpenDexter",
"proof_to_collect": "opendexter audition plus host/resource page readback",
"submit_or_readback_hint": "npx -y @dexterai/opendexter@latest audition premium_dataset --json"
},
{
"status": "fix_first",
"blocker": "GET/HEAD/POST probes need 402 behavior and schemas",
"surface": "Decixa / live-probe directories",
"proof_to_collect": "verified listing URL, x402 verified, uptime, schema compliance",
"submit_or_readback_hint": "submit canonical paid POST route premium_dataset"
}
],
"scanner_compatibility_checks": [
{
"fix": "return numeric x402Version: 2 in the Payment-Required payload",
"check": "x402_v2_number",
"status": "fail",
"finding": "missing x402Version"
},
{
"fix": "use network eip155:8453, not a free-text chain alias",
"check": "base_caip2_network",
"status": "fail",
"finding": "missing network"
},
{
"fix": "encode USDC atomic amount as a decimal string",
"check": "atomic_amount_string",
"status": "fail",
"finding": "missing amount"
},
{
"fix": "include the seller payTo wallet in accepts[0].payTo",
"check": "pay_to_present",
"status": "fail",
"finding": "missing payTo"
},
{
"fix": "bind payment.resource.url to the exact route buyers will retry after paying",
"check": "resource_binding",
"status": "unknown",
"finding": "missing resource.url"
},
{
"fix": "send both Payment-Required and x-payment-required for scanner compatibility",
"check": "dual_payment_headers",
"status": "warn",
"finding": "Payment-Required=false x-payment-required=false"
},
{
"fix": "add Cache-Control: no-store on 402 responses",
"check": "no_store_402",
"status": "warn",
"finding": "no-store not verified"
},
{
"fix": "include EIP-712 domain extra { name: 'USD Coin', version: '2' } when your facilitator/client expects it",
"check": "usdc_eip712_domain",
"status": "warn",
"finding": "extra.name/version not exposed"
}
]
}Tags
x402
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