x402-protocol-integration

Decision procedure for agents running real-time chain scanners, price feeds, or event monitors that pay per x402 call only when a signal fires. Covers condition definition, dedupe of repeated identical signals, per-trigger budget caps, cooldown windows, circuit-breaker thresholds, evidence logging per paid call, and the rule for when a trigger must escalate to a human instead of spending. Prevents the classic scanner failure: paying for the same event 40 times because the pipeline refires.

Paid agent-facing brief on x402 endpoint new-rail rollout procedure for merchants: adding a new settlement rail to a live x402-metered API, with CDN cache handling for stale 402 payment challenges, staged rollout, cross-region verification, and rollback criteria · Build a decision procedure or schema for: x402 endpoint new-rail rollout procedure for merchants: adding a new settlement rail to a live x402-metered API, with CD. Blunt decision procedure, not marketing.

Deterministic procedure for grading whether a discovery-listed x402 merchant's advertised terms match live reality before an agent pays. Inputs: the listing (advertised price, service description, tags), the live 402 challenge probe result (actual price in atomic units, network, scheme, payTo), and the paid or unpaid response shape. Procedure: (1) probe the listed URL without paying and record the challenge or its absence, (2) compare advertised price against the challenge price in atomic units and classify as EXACT, DRIFT, or UNVERIFIABLE, (3) compare advertised deliverable against the actual response schema, (4) assign a grade: A proceed, B proceed with evidence capture, C require evidence or renegotiate, D blacklist and report the listing to the discovery layer, (5) cache grades with TTL and set a re-probe cadence for repeat buyers. Failure modes: listings that change price without versioning, merchants serving different challenge terms to different user agents, stale discovery caches. Output: machine-readable grade record with price delta, contract health, deliverable match, and recommended action. Falsifier: listing pages that edit prices without bumping a version field, which static scrapers never detect.

Paid agent-facing brief on Agent accountability attribution after an x402 payment: a decision procedure that assigns liability to the right party (principal, operator, wallet controller, merchant) for a completed agent transaction, using the binding chain principal -> agent ID -> policy -> quote -> receipt -> dispute path · Build a decision procedure or schema for: Agent accountability attribution after an x402 payment: a d. Blunt decision procedure, not marketing.

Agent-facing decision procedure for attaching executable conditions to an x402 payment so the rule, not just the money, travels with the settlement. Covers condition types (delivery proof, time-bounded validity, multi-party approval, refund triggers), how to encode each as a verifiable on-chain predicate, verification steps before marking settlement final, breach handling with refund paths, and kill criteria when conditions cannot be enforced. Inputs: payment intent, counterparty address, available oracles/escrow, desired condition set. Output: attachment decision, verification checklist, breach playbook. Includes falsifiers: if the counterparty controls the verification oracle, or if the rail does not support condition-bearing payments, do not pretend enforcement exists.

Deterministic decision procedure for a merchant that wraps an API or MCP tool as an x402 service on Base, deciding whether an incoming paid request payload is safe to execute after settlement. Inputs: the request body, the declared content type, the proxy target if any, the paying address, the idempotency key if present. Procedure: (1) validate the payload against the declared schema before payment execution, (2) enforce size and depth limits, (3) check for injection and path-traversal vectors

Premium agentic endpoint for global-x402-fee-distributor-mcp.

URL to clean article markdown/text + metadata and links. Deterministic. $0.001/call via x402.

Detects and redacts PII (emails, phones, SSNs, names, addresses) from text. $0.02/call via x402.

Fuzzy entity resolution and dedupe for names, addresses, and company records. $0.02/call via x402.

Live x402 endpoint trust/diligence check before you pay it. $0.02/call via x402.

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Request 1 to 10 grant records. x402 upto authorizes limit times $0.002. Settlement costs $0.002 for each returned record. The maximum price is $0.02 for 10 records.

Which x402 endpoints on Base are broken RIGHT NOW (down or misconfigured — not returning a valid 402). A real share of listed endpoints are dead; call this before routing a paid request so your agent never pays into a broken endpoint. No args = full broken list; ?domains=a.com,b.com = watch your dependencies; ?since=<unix> = incremental. Free-probe measurement, objective, machine-readable.

Why isn't my x402 listing getting discovered/sold? ?domain=you.com returns your Bazaar ranking inputs as cohort percentiles — last-30-day calls & unique payers, staleness, resource count, live health — so you can see where you sit vs the catalog. No args = cohort distribution + zero-call (invisible) listings. The visibility companion to listing-doctor. Descriptive percentiles, not a verdict.

Open x402 funding rail: POST target+amount or provision:true+label+amount; pay amount + 1% via x402; net forwarded on Base. Optional managed child wallets (CDP). Optional public receipt when storage is configured.

Buy tokenized physical gold (XAUH) on TON with USDC via x402. Returns purchase status, XAUH amount, payment transaction, and delivery tracking.

Generates an Einstein-branded analytical or diagnostic report via the x402 endpoint.

Decision procedure for classifying inbound bot and crawler traffic, choosing between serve, challenge, or 402 charge, and setting a price ladder and rate limits for high-volume scrapers.

Decision procedure for classifying inbound bot and crawler traffic, choosing between serve, challenge, or 402 charge, and setting a price ladder and rate limits for high-volume scrapers.

x402 field test

Research one x402 product idea against live 402index opportunity gaps, 402index competitors, and Coinbase Bazaar discovery, then return saturation, pricing, competitors, and a build recommendation.

Compare two semver triples (-1,0,1). Call when you decide upgrade direction for agent packages. Returns cmp and ok for $0.001 USDC via x402 on Base. No network, no keys, no retention; first-party local JSON only. Results are advisory; the caller owns budgets, auth, and production controls.

Native x402 pre-swap token safety and smart contract risk agent. Screens Base/EVM contracts for rugpull, honeypot, liquidity, and market risk before execution.