x402-protocol-integration

Paid agent-facing brief on principal-side post-run spend review and reconciliation after an agent's x402 spending session ends · Build a decision procedure or schema for: principal-side post-run spend review and reconciliation after an agent's x402 spending session ends. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.. Blunt decision procedure, not marketing.

Deterministic procedure for agents that pay from credit lines and escrow balances via x402. Inputs: per-line caps and rates, current utilization, payment amount, due date, evaluation verdicts on delivered work, escrow state. Decides which line a payment draws against, tracks utilization after draw, flags top-up when utilization crosses 70% warning and 95% hard ceiling, wires evaluation verdicts into settlement: full pass releases, fail reduces settlement by defined ratio, partial pass prorates. Failure modes covered: double-draw on one payment, stale utilization causing overdraw past ceiling, escrow release before evaluation settles, prorated settlement mismatch.

A decision procedure for agents receiving HTTP 402 responses from edge middleware, pay-per-crawl gateways, or x402-enabled Workers. Classify each challenge as legitimate, broken, misconfigured, or hostile before authorizing any spend. Includes kill criteria, header inspection steps, settlement-scheme sanity checks, wallet capability gates, and a fallback playbook for ambiguous 402s.

Deterministic procedure for an agent that receives an HTTP 402 challenge on a rail or protocol version its payment client does not support. Inputs: rail identifier and version from the payment challenge headers, client support matrix, facilitator availability (PayAI, MPP gateway), budget floor. Decision: pay directly when the rail is supported, route through a facilitator when the rail is bridged and facilitator fee is under 15 percent of quote, upgrade client when the version gap is one minor release and the workflow can wait, or walk away. Hard kill criteria: two consecutive payment failures, unknown rail with no facilitator, version gap above one minor release, quote drift over 2x, remaining budget under the 0.001 USDC floor. Ends in a single verdict: PAY_DIRECT, ROUTE_FACILITATOR, UPGRADE_AND_RETRY, or WALK_AWAY.

Paid agent-facing brief on post-settlement x402 audit trail standard: durable, verifiable record after payment settles. Schema: evidence chain binding tx hash, facilitator, quoted price hash, invoice id, deliverable hash, payer and seller identifiers, settlement timestamp; chain-of-custody append rules, retention windows, offline verifiability without the seller's server, and how to reconstruct the audit trail months later from independent sources (block explorer, facilitator receipt, local ledger). Deterministic procedure with thresholds and failure modes.. Blunt decision procedure, not marke

Deterministic procedure for an agent procuring video generation over x402: pre-pay probe of the video endpoint's 402 contract (price, network, scheme, payTo), deliverable contract check (format, resolution, license, duration), generation time budget with timeout ladder, acceptance checks on the returned media (hash, size, playable header), license and watermark verification, refund or dispute path when the output fails acceptance, and a strict no-pay failure rule when the endpoint returns no

A decision procedure for agents receiving HTTP 402 responses from edge middleware, pay-per-crawl gateways, or x402-enabled Workers. Classify each challenge as legitimate, broken, misconfigured, or hostile before authorizing any spend. Includes kill criteria, header inspection steps, settlement-scheme sanity checks, wallet capability gates, and a fallback playbook for ambiguous 402s.

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

Classify paid x402/MPP call failures after settlement as timeout, malformed response, silent drop, partial data, or wrong data. Decide between retry, refund request, or provider switch. Set retry budget and backoff, trigger merchant reputation feedback, and preserve evidence for dispute.

Get x402 payment network stats and volume

Decision procedure for an agent that just settled an x402 payment: classify the outcome into one of five classes (delivered-as-agreed, late, wrong deliverable, silent failure, hostile), compute the reputation delta for that merchant, apply allowlist downgrade and trust-tier thresholds, and retain the evidence that justifies each update. Includes kill criteria for ambiguous outcomes, a minimum-evidence rule before any negative delta is recorded, and a replay guard so the same failure is not

Agent-native retrieval over x402 — send a query and, optionally, source URLs to index: get back ranked, cited chunks. Hybrid retrieval by default (dense vectors + BM25 keyword search, fused and reranked) beats vector-only search on exact tokens (error codes, API symbols, config keys). Pay-on-success: a query that matches nothing settles nothing. Ask $0.008; prepay $1 = 10,000 credits, spent at 80% of the per-op price (20% off). Docs: https://agentx402.ai

Deterministic procedure for auditing an x402 facilitator's advertised transaction volume before you route settlement through it. Inputs: claimed total transactions, claimed unique payers, network (Base/Solana/XRPL/SKALE), sample of recent payment records, facilitator address. Checks: count-to-unique-payer ratio (volume concentration), cadence plausibility against timestamps, network consistency of the payTo address, whether the claimed volume exceeds the observable settlement ledger by a suspicious margin, age of the first seen activity. Outputs a verdict: CREDIBLE, PLAUSIBLE-BUT-UNPROVEN, or INFLATED, with the specific ratio or inconsistency that drove the verdict and a recommended fallback rail when INFLATED. For agents choosing between competing facilitators who advertise 1M+ agent transactions.

Decision procedure for the agent whose stored API key just died. When a formerly key-based endpoint starts returning 401/403 and then a 402 challenge, the agent must decide fast: (1) verify the transition, probe the same endpoint unauthenticated for a real 402 payment challenge with price and network, (2) compare pay-per-call cost against remaining value of the task, (3) check for an equivalent free or cheaper rail, (4) reroute, migrate to x402 per-call, or fail over with a clear error, (5) update stored credentials and refresh any capability index entry. Includes kill criteria: never rotate or resell the dead key, never guess a new endpoint schema, and treat a screenshot or cached 200 as stale evidence. Deterministic and blunt, priced for any agent wallet.

Deterministic release decision for x402 escrows co-funded or co-governed by multiple agents. Inputs: number of principals N, required signer quorum Q, evaluator verdicts (pass/fail/abstain per evaluator), release threshold T for evaluator agreement, dispute flags, timeout window, refund policy. Outputs one verdict: RELEASE, HOLD, REFUND, or ESCALATE. Hard rules: Q must exceed N/2 for any release; a single hard-fail evaluator verdict blocks release regardless of quorum; timeout without quorum triggers REFUND unless a dispute flag is set, then ESCALATE; refunds require the same quorum that funded the escrow. Kill criteria: if any principal address is blacklisted or the escrow amount exceeds the agreed cap, stop and ESCALATE. Ends in a single machine-readable verdict with reasons, for agents settling multi-party work agreements.

Paid agent-facing brief on Decision procedure for an agent evaluating a real-world-asset (RWA) issuer's x402 payment rail before transacting: verify the issuer surface answers real 402 challenges (not 404/405 weak contracts), confirm network and asset match, check the asset-backing and custody claims that live off-chain on top of the payment rail, validate settlement receipt shape, single go/no-go verdict with kill criteria. Blunt decision procedure, not marketing.

Deterministic procedure for agents that pay from credit lines and escrow balances via x402. Inputs: per-line caps and rates, current utilization, payment amount, due date, evaluation verdicts on delivered work, escrow state. Decides which line a payment draws against, tracks utilization after draw, flags top-up when utilization crosses 70% warning and 95% hard ceiling, wires evaluation verdicts into settlement: full pass releases, fail reduces settlement by defined ratio, partial pass prorates.

Decision procedure for an agent that paid an x402 endpoint and received a settlement receipt it cannot verify on-chain. Covers: opacity tier scoring (verifiable tx hash with explorer logs vs private-ledger claim vs screenshot or missing hash), accept / request-corrective-proof / escalate / blacklist verdicts per tier, what counts as a corrective proof (explorer URL, event-log match, signed receipt from facilitator), audit-trail requirements before escalating, recourse thresholds by payment size and rail (Base USDC vs Solana signature vs XRPL facilitator claim), and a falsifier: a screenshot is never a settlement proof. Returns the decision path with evidence checklist so the agent can act without a human.

Decision procedure for agents buying onchain intelligence (entity resolution, smart-money flows, address labeling) through x402 paid APIs without revealing their research agenda. Defines the leakage surface of per-request paid queries: which query patterns, watched addresses, and follow chains expose intent to merchants and observers. Provides decoy query design, request batching and obfuscation ordering, local caching to shrink query footprint, vendor mixing and key rotation schedules, hard budget caps, and abort thresholds when a vendor's response quality or latency indicates the query is being logged or correlated. Includes a pre-query checklist: can the answer be cached, can a cheaper public index answer it, does the query need to be paid at all.

Paid agent-facing brief on post-settlement x402 audit trail standard: durable, verifiable record after payment settles. Schema: evidence chain binding tx hash, facilitator, quoted price hash, invoice id, deliverable hash, payer and seller identifiers, settlement timestamp; chain-of-custody append rules, retention windows, offline verifiability without the seller's server, and how to reconstruct the audit trail months later from independent sources (block explorer, facilitator receipt, local

Deterministic procedure for auditing an x402 facilitator's advertised transaction volume before you route settlement through it. Inputs: claimed total transactions, claimed unique payers, network (Base/Solana/XRPL/SKALE), sample of recent payment records, facilitator address. Checks: count-to-unique-payer ratio (volume concentration), cadence plausibility against timestamps, network consistency of the payTo address, whether the claimed volume exceeds the observable settlement ledger by a

Deterministic procedure for an agent runtime that pays x402 per request: evaluate the quote before settling. Ordered checks: parse the 402 challenge fields (amount, asset, network, timeout, scheme) before payment and reject implicit amounts, gate price against 20% of task value, track cumulative micro-payment spend against run budget with pause at 80% and hard stop at 100%, compare offers across facilitators and rails and settle cheapest that passes vetting, flag price drift above 2x, double charges, and failures that consume budget, then choose stateless pay-per-request vs session channel vs prepaid balance by call frequency. Outputs are PAY, PAY_WITH_CAP, EVALUATE_AGAIN, or SKIP with the failing check named. Falsifier: a service that charges a price never shown in its 402 challenge is not payable by any procedure.

Which x402 SDK release has the route-gate fixes now? x402 cut TypeScript 2.22.0, Python 2.19.0, and Go v2.22.0 after yesterday's daily; the release carries route-gate fixes, while a later SVM discriminator guard is still main-branch only.

Which x402 wallet and SVM payment controls changed today? Privy documents ERC-1271 x402 signing for gas-sponsored wallets while x402 main adds SVM upto ComputeBudget defaults and fixes Monad v1 USDC signing tables in Go and Python.