Every agent-payable API.

Compares caller-supplied x402 facilitator cost facts for buyer-agent routing.

Scores caller-supplied x402 facilitator facts for production readiness.

Classifies sanitized x402 failure facts into safe diagnostic causes without replaying payments or storing raw logs.

Compares agent-commerce quote, checkout, final payment, and order totals for unexplained deltas.

x402 fleet health status API — live up/down check of core endpoints with timestamp, for AI agent monitoring dashboards. $0.001 USDC on Base per call.

x402 hello-world — $0.01 prove-the-rail settle. Returns signed Ed25519 receipt attestation + echo so your wallet stack has verifiable proof it can pay.

x402 Inspector scan (payment-challenge validation) — per call

Buyer agents can land on public docs but fail to find service purpose, examples, price, limitations, and support path.

Maps aggregate high-volume low-value machine-payment facts for treasury dust and reconciliation risk.

MCP/App SDK builders need to know whether tool schemas, action descriptions, privacy metadata, auth notes, and UI hints are ready for review.

Audits sanitized MCP elicitation prompts and consent facts for scope and record gaps.

Records and compares hash-only x402, OpenAPI, and MCP operation stability facts.

Maps paid MCP tool surfaces against x402 routes and possible unpaid aliases.

Audits sanitized MCP paid-tool permission scope declarations.

Checks MCP server release metadata for registry and paid-tool readiness.

MCP resource lists can mix public docs, schemas, logs, user data, and restricted-looking resources without clear buyer labels.

MCP servers can expose sampling behavior that is hard for buyers to understand before connecting or paying.

Grades paid MCP tool names, descriptions, schemas, and output labels for buyer-agent clarity.

Classifies one-shot MCP paid-tool metadata changes for buyer-agent compatibility risk.

Maps caller-supplied agent-commerce role facts into payment, fulfillment, support, and refund boundaries.

Builds an advisory failover ladder for caller-supplied x402 facilitator and network options.

Normalizes safe x402 challenge metadata from multiple provider formats.

Plans safer x402 network, token, amount-format, and transfer-method routing from caller facts.

Buyer agents often see a price and promise but no useful preview that proves what the paid result will contain.

Tracks hash-only completeness snapshots for paid-agent response contracts across releases.

Audits paid MCP/tool confirmation prompts for clear buyer spend consent.

Creates and verifies hash-only latency SLA evidence for paid agent tools.

Orders caller-supplied paid agent tools into a clear, trust-preserving upsell path.

Classifies timeout, cancellation, partial result, retry, and charge-policy facts for paid work boundaries.

x402 payability check: reachable + well-formed 402 + (Solana) destination-ATA existence

x402 payability check for sellers: can a real buyer actually pay your endpoint? Sends one payment signed by a fresh unfunded key through your server and facilitator. A payable endpoint fails only on balance; anything else (bad schema, long description, wrong EIP-712 domain, facilitator error) is reported with the exact reason. Base USDC, x402 v1 and v2.

Classifies x402 payment identifier and retry facts for duplicate-charge and privacy risk.

Maps payment rails, handlers, tokens, networks, wallet requirements, and buyer disclosures.

Explains buyer-agent approval friction for EIP-3009, Permit2, and unsupported transfer methods.

Checks sanitized order, webhook, shipment, delivery, return, refund, and adjustment facts for continuity.

x402 pre-listing QA probe: validate your endpoint's 402 challenge, header sizes, and payment schema before listing

Checks x402 price display units for decimal, atomic-unit, currency, and network consistency.

Buyer agents and marketplaces cannot quickly tell whether public release notes matter to their workflows.

Lints caller-submitted agent API, MCP, and x402 response samples for machine-actionable contract completeness without making network calls.

Creates or verifies hash-only caller-submitted x402 response provenance records with scoped idempotency and one-time lookup secrets.

x402 seller audit for a whole origin: finds your paid routes (GET and POST) in /.well-known/x402, /openapi.json and your own CDP Bazaar listings, then sends each one an unfunded test payment through your server and facilitator. Per-route verdict, exact rejection reason and a fix hint. Up to 40 routes, one payment.

Is this x402 seller real? Pass ?seller= with a host (api.example.com) or a payTo address (0x...). From Coinbase's own Bazaar counts (re-read every 6 hours) we return its listings, 30-day payers and calls, and the one number that separates customers from a test harness: how many times the average payer came back. For an Arc payTo we add its settlements from our full Arc x402 index: distinct payers and the top payer's share.

Sellers need to know whether paid-agent endpoints are priced, discoverable, converting, or leaking free access.

x402 seller trust leaderboard — every catalogue origin probed outside-in and scored 0-100, with the verdict spread and the most common reasons points were lost

Daily JSON bundles for agents from Bouncer-graded x402 sellers: crypto news beats, market structure and volatility views, price snapshots, agent trust checks, Base gas, US macro, Brazil calendar. This route serves the x402-sellers-reputation bundle.

x402 settlement inspection credit pack API — buy 10 Base/USDC settlement-analysis calls for agent payment diagnostics.

X402 Settlement Network Check: X402 Settlement Network Check compares settlement chain with the accepted challenge network from bounded caller-supplied values without an external provider. Call X402 Settlement Network Check before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Settlement Network Check as…

Scores signed offer and receipt metadata for paid-service delivery confidence.

Checks whether a bounded spend permission fits a caller-supplied paid-agent workload.

x402 Starter Kit — everything an AI agent needs to start paying and earning on-chain: quickstart code, full endpoint catalog, live bounty radar + news snapshot, seller trust proof